JP2003322243A - Gear structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and easily perform manufacturing and transfer a stable, accurate drive force with a simple structure. <P>SOLUTION: Restriction parts 114 formed to be cut in a smaller diameter than the tip outer diameter are provided to one region in the tooth thickness direction of a tooth part 112 constituting a gear part of a second gear 11. Engagement parts 103 with which the restriction parts 114 of the second gear 11 are engaged are provided to a first gear 10. The restriction parts 114 of the second gear 11 are engaged with the engagement parts 103 of the first gear 10 and constituted so as to be integrally vertically stacked. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear structure used in a gear transmission mechanism such as a camera.

[0002]

2. Description of the Related Art Conventionally, so-called step gears in which different spur gears are coaxially stacked are arranged in a gear transmission mechanism of a camera or the like. In such a stepped gear, one spur gear may be formed by molding, and the other spur gear to which a high torque is applied may be formed of a metal material according to the purpose of use such as torque to be transmitted. As a means for manufacturing a stepped gear, a round boss is formed on the same rotary shaft of one spur gear, and a round hole is formed oppositely on the same rotary shaft of the other spur gear. A method is adopted in which they are integrated and stacked by press-fitting.

However, in the above-mentioned stepped gear, when a large torque is applied to each other, so-called slippage occurs between the spur gears, which makes it difficult to stably transmit the driving force.

Therefore, the round bosses and holes formed in the spur gear are replaced with oval-shaped oval-shaped bosses and holes, and these oval-shaped bosses are press-fitted into the oval-shaped holes to integrate them. A press-fitting structure is also adopted in which the rigidity in the rotational direction is enhanced by arranging them in a stacked manner. In this press-fitting structure, even if relatively large torques are applied to each other, slippage does not occur between them,
It is possible to realize stable transmission of driving force.

However, in the above-mentioned press-fitting structure, since the shape configuration is complicated, when the stepped gear is made of a metal material, it is necessary to perform complicated machining such as milling for the processing. Its production is very troublesome and expensive.

[0006]

In the conventional stepped gear, there is a possibility that slips may occur between the step gears when the applied torque becomes large, and if it is configured to prevent the slips, the machining process becomes troublesome. However, it has the disadvantage of being expensive.

The present invention has been made in view of the above circumstances, and it is possible to realize a simple structure, a simple and inexpensive manufacturing process, and a stable and highly accurate transmission of a driving force. It is an object of the present invention to provide a gear structure as described above.

[0008]

SUMMARY OF THE INVENTION The present invention is a gear structure in which a driven member and a driving member are integrally formed by combining them on the same rotary shaft, and the driven member and the driving member are combined. A gear part having a predetermined tip outer diameter formed on one side, a restricting part formed in a part of the gear part in the tooth thickness direction in a shape cut to a diameter smaller than the tip outer diameter, and the driven part. A side member and the driving side member, and is configured to include a fitting portion into which the regulating portion is fitted so as to integrate the driven side member and the driving side member. is there.

According to the above construction, the regulation portion is formed on the gear portion provided on one of the driven side member and the driving side member, and the fitting portion into which the regulation portion of one gear portion is fitted on the other side. Are formed so that they are fitted with each other to be integrated. Therefore, by cutting a part of the gear part, the restricting portion provided on one of the driven-side member and the driving-side member can be formed in a shape capable of reliably preventing slippage, which is simple and easy. Easy production is realized.

Further, according to the present invention, one of the driven member and the driving member is made of a metal material. As a result, it becomes possible to provide for transmission of a larger torque.

Further, according to the present invention, the press-fitting portion and the press-fitting portion for integrally coupling the driven-side member and the driving-side member with the restriction portion and the fitting portion fitted together are provided. Is provided on the driven side member and the driving side member coaxially with the rotating shaft.

According to the above structure, the driven side member and the drive side member are integrated by the restricting portion, the fitting portion, the press-fitting portion, and the press-fitted portion, so that the rotational direction and the axial direction are changed. Each is integrated, enabling a robust stacking arrangement.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a gear structure according to an embodiment of the present invention. The first gear 10 constitutes, for example, a drive side member as a transmission member, and is driven by, for example, a drive source (not shown). The force is transmitted and driven to rotate. This first
The second gear 11 having, for example, a small diameter, which constitutes a driven member as a transmission member, is integrally stacked and arranged on the gear 10.

Of these, the second gear 11 is made of, for example, a metal material, and has a shaft fitting hole 111 in the center thereof. Then, around the shaft fitting hole 111 of the second gear 11, a plurality of tooth portions 112 forming a gear portion having a predetermined tooth tip outer diameter are formed at predetermined intervals. Then, on one surface of the second gear 11, a convex press-fitting portion 113 formed by cutting each tooth portion 112 into a diameter smaller than the outer diameter of the tooth tip is coaxial with the shaft fitting hole 111. Is formed.

Further, each tooth portion 1 of the second gear 11 is
A plurality of restriction parts 114 are provided between the press-fitting part 113 and the press-fitting part 113. The restricting portion 114 is formed, for example, in each tooth portion 112 in a stepped shape that is cut in the tooth thickness direction by a predetermined dimension smaller than the tooth tip outer diameter, and the inclined surface 1 inclined in the axial direction is formed in the middle portion thereof.
15 is formed in the provided shape. This inclined surface 115
By providing the, it is possible to easily find the rotational direction position during press-fitting work.

In the other first gear 10, a plurality of tooth portions 101, which are gear portions having a predetermined tooth tip outer diameter, are formed at predetermined intervals by, for example, molding, and the press-fitting hole 1 is formed at the center thereof.
02 is formed coaxially so as to correspond to the press-fitting portion 111 of the second gear 11. In addition, the first gear 10 has a structure shown in FIG.
As shown in FIG. 5, a plurality of concave fitting portions 103 are formed at one end of the press-fitting hole 102 at predetermined intervals corresponding to the restricting portions 114 of the tooth portion 112 of the second gear 11.

In the above structure, the first gear 10 and the second gear 10
When stacking the gears 11 of No. 1 as described above, the press-fitting portion 113 of the second gear 11 is press-fitted into the press-fitting hole 102 of the first gear 10 as shown in FIGS. 3 and 4. At this time, the restricting portion 114 of the second gear 11 is connected to the fitting portion 10 of the first gear 10.
3 is fitted. Thereby, the first and second gears 1
0 and 11 are positioned in the rotational direction by the action of the press-fitting hole 102 and the press-fitting part 113, and the fitting part 10
By the action of 3 and the restricting portion 114, they are integrated and combined in a stack in a state where the rotational directions thereof are positioned.

Then, the shaft fitting holes 111 of the second gears 11 arranged in a stack are fitted to a support shaft 121 provided in the film winding device body 12 as shown in FIG. A pressing plate 13, which is a pressing member for restricting the axial direction of the first and second gears 10 and 11, is provided at the tip of the support shaft 121. In this state, the driving force from the driving source (not shown) is transmitted to the first gear 10, and the first gear 10 is rotationally driven with respect to the device body 12 via the support shaft 121. Here, the second gear 11 is integrally rotationally driven in conjunction with the rotation of the first gear 10, and for example, rotationally drives the drive unit in the device body 12 to execute a desired operation.

As described above, in the above-described gear structure, the tooth portion 112 forming the gear portion of the second gear 11 is formed in a partial region in the tooth thickness direction that is cut to a diameter smaller than the tip outer diameter. A portion 114 is provided, and a fitting portion 103 into which the restriction portion 114 of the second gear 11 is fitted to the first gear 10 is provided, and the restriction portion 114 of the second gear 11 is provided as the first gear. 1
It is configured to be fitted in the fitting portion 103 of No. 0 and integrally stacked.

According to this, the tooth portion 11 of the second gear 11 is
By forming the restriction portion 114 on the second gear 10 and the fitting portion 103 on which the restriction portion 114 is fitted on the first gear 10, the first gear 10 is fitted with each other to be integrated, Two
It is possible to form the restriction portion 114 provided on the gear 11 of the gear 11 into a shape that can reliably prevent slippage by simply cutting a partial region of the tooth portion 112, and a simple and easy manufacture is realized. . That is, when the second gear 11 is made of, for example, a metal material, the tooth portion 1 having a predetermined tip tip outer diameter is temporarily provided.
After 12 is formed, it is possible to manufacture by a machining process in which a partial region of the tooth tip is cut into the above-mentioned cut shape, and it is possible to easily and easily perform machining.

Further, in the above-mentioned gear structure, the restriction portion 114 and the press-fitting portion 113 are coaxial with the second gear 11.
And the fitting portion 103 coaxially with the first gear 10.
And the press-fitting hole 102, and the press-fitting part 1 of the second gear 11 is arranged.
13 is press-fitted into the press-fitting hole 102 of the first gear 10, and the restriction portion 114 is fitted into the fitting portion 103 so as to be integrally stacked.

According to this, in the state where the rotation direction and the axial direction are positioned by the restricting portion 114, the fitting portion 103, the press-fitting portion 113 and the press-fitted portion 102, the first portion
By arranging the gear 10 and the second gear 11 integrally as a stack and arranging them, a robust combination arrangement is possible.

In the above embodiment, the first gear 1
The case where the 0 fitting portion 103 is formed in substantially the same shape as the restricting portion 114 of the second gear 11 and the positioning in the rotational direction is performed has been described, but the present invention is not limited to this. It is also possible to form the shape of the fitting portion 103 of the gear 10 such that the shape other than the rotational direction for positioning is formed to have a large diameter.

Further, in the above embodiment, the second gear 1
The description has been given of the case where the restriction portions 114 are formed on all of the first tooth portions 112 and all of the restriction portions are configured to be fitted to the fitting portions provided on the first gear, but the invention is not limited to this. However, in addition, the restriction portion 114 is provided only on one or more desired tooth portions 112, and the restriction portion 114 is provided to the first gear 10
It is also possible to fit the fitting portion 103 of (1) to position in the rotational direction.

Further, in the above-mentioned embodiment, the regulating portion 11
4 and the fitting portion 103 are configured to perform only the positioning in the rotation direction, but the restriction portion 114 and the fitting portion 103 both perform the positioning in the rotation direction and the positioning in the rotation axis direction by press fitting. It can also be configured as follows. In this case, the press-fitting hole 102 of the first gear 10
And the press-fitting portion 113 of the second gear is used not as press-fitting but as radial positioning.

Further, in the above embodiment, the first gear 1
Although the case where 0 is molded and the second gear 11 is configured to be formed of a metal material has been described, the present invention is not limited to this. For example, the first gear 10 is formed of a metal material, It is also possible to configure the gear 11 of FIG. 3 by molding, or to configure both the first and second gears 10, 11 with the same material.

Further, in the above embodiment, the case where the first gear 10 is configured to be rotationally driven by the drive source (not shown) has been described, but the second gear 11 is not limited to this. The drive source (not shown) as a drive member
It is also possible to transmit the driving force from the motor and rotate the motor.

Further, the present invention is not limited to the above-described embodiment, but can be configured as shown in FIG. 6 and FIG. 7, and substantially the same effect can be expected.
However, in each embodiment shown in FIGS. 6 and 7, for convenience, the same parts as those in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.

First, in the embodiment shown in FIG.
The driving side member is formed by the pulley 14, and the driven side member is formed by the second gear 11. That is, the press-fitting hole 141 into which the press-fitting portion 113 of the second gear 11 is press-fitted and the fitting portion 142 into which the restricting portion 114 of the second gear 11 is fitted are formed in the pulley 14, respectively. The press-fitting portion 113 and the regulating portion 114 of the second gear 11 are inserted into the press-fitting hole 141 and the fitting portion 142.
Are press-fitted and fitted together to be integrated and arranged in a stack. In this case, the drive belt 15 is wound around the pulley 14, the pulley 14 is rotationally driven via the drive belt 15, and the second gear 11 is rotationally driven in conjunction with this.

Further, in the embodiment shown in FIG. 7,
The driven side member is formed by the impeller 16, and the driving unit side member is formed by the second gear 11. That is, the impeller 16 has a press-fitting hole 161 into which the press-fitting portion 113 of the second gear 11 is press-fitted and a fitting portion 162 into which the restricting portion 114 of the second gear 11 is fitted. , The press-fitting portion 113 and the regulating portion 114 of the second gear 11 with respect to the press-fitting hole 161 and the fitting portion 162.
Are press-fitted and fitted together to be integrated and arranged in a stack. Then, the second gear 11 is meshed with a driving source (not shown) so that the driving force can be transmitted, and the impeller 16 is rotationally driven in conjunction with the rotational driving.

The impeller 16 is arranged, for example, in the light path between the light emitting portion and the light receiving portion of the photo interrupter, and is used to selectively block the light path between the light emitting portion and the light receiving portion in association with the rotation thereof.

Therefore, the present invention is not limited to the above-mentioned respective embodiments, and other various modifications can be carried out at the stage of carrying out the invention without departing from the scope of the invention.
Furthermore, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

For example, even if some constituent elements are deleted from all the constituent elements shown in each embodiment, the problems described in the section of the problem to be solved by the invention can be solved, and the effects of the invention are described. When the effect can be obtained, a configuration in which this constituent element is deleted can be extracted as an invention.

Based on the above-described embodiment, (1) a gear part having a predetermined tip outer diameter and a tooth tip outer diameter of the gear part in a partial region of the tooth thickness along the rotation axis direction of the gear part. A first part having a restriction part formed in a shape cut into a small diameter
And a second transmission member which is a member separate from the first transmission member, and which has a fitting portion in which the restriction portion of the first transmission member is formed so as to be fittable, It is possible to provide a gear structure including: a coupling unit configured to combine and integrally couple the first transmission member and the second transmission member along the rotation axis direction.

(2) The coupling means described in the above (1) is integrally regulated in the rotational direction by the fitting of the regulating portion and the fitting portion, and is press-fitted and coupled in the axial direction. It is possible to provide a gear structure characterized by the above.

(3) The coupling means described in (1) above can provide a gear structure characterized in that the first transmission member and the second transmission member are press-fitted and coupled. .

(4) It is possible to provide a gear structure characterized in that a transmission gear is also formed on the second transmission member described in (1) above.

(5) It is possible to provide a gear structure characterized in that the fitting portion described in the above (1) is formed in a shape cut into substantially the same shape as the above-mentioned restriction portion.

[0040]

As described above in detail, according to the present invention, it is possible to realize a simple structure, a simple and inexpensive manufacturing process, and a stable and highly accurate transmission of a driving force. A gear structure adapted to be obtained can be provided.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an exploded gear structure according to an embodiment of the present invention.

2 is a perspective view showing a main part of the first gear of FIG. 1. FIG.

FIG. 3 is a plan view showing a state where the first and second gears of FIG. 1 are stacked and arranged.

4 is a cross-sectional view showing a cross section of a main part of FIG.

5 is a sectional view showing a state in which the gear structure of FIG. 1 is assembled to a device body.

FIG. 6 is an exploded perspective view showing an exploded gear structure according to another embodiment of the present invention.

FIG. 7 is an exploded perspective view showing an exploded gear structure according to another embodiment of the present invention.

[Explanation of symbols]

10 ... 1st gear 101 ... Tooth 102 ... Press fit hole 103 ... Fitting part 11 ... Second gear 111 ... Shaft fitting hole 112 ... Tooth 113 ... Press-fitting part 114… Regulation Department 115 ... Slope 12 ... Device body 121 ... Support shaft 13… Pressing plate 14 ... pulley 141 ... Press fit hole 142 ... Fitting part 15 ... Drive belt 16 ... Impeller 161 ... Press fit hole 162 ... Fitting part

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Claims (3)

[Claims] 1. A gear structure in which a driven-side member and a driving-side member are integrally formed by combining them on the same rotary shaft, and a predetermined tooth formed on one of the driven-side member and the driving-side member. A gear portion having a tip outer diameter, a restriction portion formed in a part of the gear portion in the tooth thickness direction in a shape cut to a diameter smaller than the tooth tip outer diameter, the driven side member, and the driving side member. And a fitting portion formed on the other side of the driven portion-side member and the driving-side member so as to be integrated with the restricting portion. 2. The gear structure according to claim 1, wherein one of the driven side member and the driving side member is made of a metal material. 3. The press-fitting portion and the press-fitting portion for integrally coupling the driven-side member and the driving-side member in a state where the restriction portion and the fitting portion are fitted, The gear structure according to claim 1 or 2, wherein the driving side member and the driving side member are provided coaxially with a rotating shaft.