JP7339488B2 - gear - Google Patents

Description

The present invention relates to gears.

Gears are widely used in a wide variety of equipment because they have the function of transmitting rotational motion while changing the speed by meshing multiple gears, or converting rotational motion into linear motion by meshing with a rack with linear teeth. ing.
Since the teeth of the gear are partly engaged with the teeth of other gears, etc., a large load is applied to these teeth, and they are likely to be damaged or worn. At this time, replacing the entire gear not only required a great deal of manpower and work time, but also was very costly.
This is the same whether it is a driving gear or a driven gear.

Conventionally, Patent Document 1 discloses a gear which is composed of a gear and a boss and which is formed by dividing the gear so that the gear can be replaced.
In such a split gear, if the teeth become partially lost or worn out and the gear becomes unusable, it can be split without disengagement from other gears. Replacement and repair can be performed only by replacing a part of the gear.

Microfilm of Japanese Utility Model Application No. 46-113343 (Japanese Utility Model Application No. 48-67152)

However, in the gear disclosed in Patent Document 1, the fixed plate fixed to the split pieces of the gear is attached and fixed only with bolts and nuts. rattles against the fixed plate, and there is a risk that force will not be sufficiently transmitted to other gears.
The problem to be solved by the present invention is that it is possible to replace only a part of the divided part without disengaging the engagement with other gears etc. while continuing to rotate, so that the divided part is attached to the stationary platen. To provide a gear that is less likely to rattle.

The invention according to claim 1 comprises a detachable part having a large number of teeth on the outer peripheral surface and a fixed platen, the detachable part is divided into a plurality of divided parts in the circumferential direction, and each divided part is detachable by a fastener. and a convex portion is formed along the entire outer peripheral edge of the stationary platen, and a concave portion is formed in the dividing portion. and the recess are engaged with each other.
In the invention according to claim 2, there are a plurality of fasteners for detachably attaching the divided portion to the stationary platen, and the plurality of fasteners are composed of a first fastener and the first fastener. and a second fastener arranged rearward in the rotation direction of the detachable part, wherein the distance from the center of rotation of the detachable part where the first fastener is arranged and the detachable part where the second fastener is arranged 2. The gear according to claim 1, wherein the distance from the center of rotation of the portion is different.
The invention according to claim 3 is provided with a detachable part having a large number of teeth on the outer peripheral surface and a stationary platen, the detachable part is divided into a plurality of divided parts in the circumferential direction, and each divided part is detachable by a fastener. one of the joint surfaces of the stationary platen and the dividing portion is formed with a recess, and the other is formed with a recess, and the protrusion and the recess are not engaged with each other. and a plurality of fasteners for detachably attaching the divided portion to the stationary platen, the plurality of fasteners being a first fastener and a rearward of the detachable portion in the rotational direction of the first fastener. a distance from the center of rotation of the attachment/detachment section where the first fixture is arranged, and a distance from the center of rotation of the attachment/detachment section where the second fixture is arranged is a gear characterized in that
In the invention according to claim 4, the gear is a driving gear, and the distance from the center of rotation of the attachment/detachment section where the first fastener is arranged is the detachment section where the second fastener is arranged. 4. The gear according to claim 2 or 3, wherein the distance from the center of rotation of the
In the invention according to claim 5, the gear is a driven gear, and the distance from the center of rotation of the attachment/detachment section where the first fastener is arranged is the detachment section where the second fastener is arranged. 4. The gear according to claim 2 or 3, characterized in that the distance from the center of rotation of the .
The invention according to claim 6 is the gear according to any one of claims 1 to 5, characterized in that a gap is formed between the adjacent divided parts.
The invention according to claim 7 is the gear according to any one of claims 1 to 6, wherein the divided portion is divided in the circumferential direction through the valley portion of the tooth. be.
Further, as another invention, the following may be used.
Means 1 includes a detachable portion having a large number of teeth on its outer peripheral surface and a fixed platen, wherein the detachable portion is divided into a plurality of divided portions in the circumferential direction, and each divided portion is detachably fixed by a fastener. It is attached to a plate, and a convex portion is formed on one of the joint surfaces of the fixed plate and the divided portion, and a concave portion is formed on the other, and the convex portion and the concave portion are engaged. It is a gear that

Means 2 includes a plurality of fasteners for detachably attaching the divided portion to the stationary platen, and the plurality of fasteners are composed of a first fastener and rotation of the detachable portion rather than the first fastener. a distance from the center of rotation of the attachment/detachment section where the first fixture is arranged, and the center of rotation of the attachment/detachment section where the second fixture is arranged. 2. A gear according to means 1 , characterized in that the distances from are different.

Means 3 is that the gear is a drive gear, and the distance from the rotation center of the attachment/detachment section where the first fastener is arranged is the distance from the rotation center of the attachment/detachment section where the second fastener is arranged. 3. A gear according to means 2 , characterized in that the distance is greater than the distance of .

Means 4 is that the gear is a driven gear, and the distance from the center of rotation of the attachment/detachment section where the first fixture is arranged is the distance from the center of rotation of the attachment/detachment section where the second fixture is arranged. 3. A gear according to means 2 , characterized in that the distance is shorter than the distance of .

Means 5 is the gear according to any one of Means 1 to 4, characterized in that a gap is formed between the adjacent divided portions.

Means 6 is a gear according to any one of means 1 to 5, characterized in that said division is circumferentially divided through said tooth roots.

According to the present invention, when a problem occurs in one of the divided parts, the divided part can be moved to a position where it does not engage with other gears, etc., so that the engagement with other gears, etc. can be easily disengaged. It is possible to replace only the worn or damaged divided portion, which greatly reduces the labor and cost required for replacement.
In addition, since the split portion attached by the fastener is engaged with the concave portion and the convex portion formed on the joint surface with the stationary platen, the split portion is fixed even if a large force is applied to a part of the tooth. It is possible to prevent rattling with respect to the board.

In addition, a plurality of fasteners for detachably attaching the divided portion to the fixed plate are at least a first fastener and a second fastener arranged behind the first fastener in the rotation direction of the detachable portion, and the first fastener is By making the distance from the center of rotation of the detachable part to be arranged different from the distance from the center of rotation of the detachable part to be arranged with the second fixture, a large force is applied to the tooth in the direction of rotation of the other gear. Even if it is added, it is possible to further prevent the split portion from rattling with respect to the stationary platen.

In addition, when the gear is a drive gear, the distance from the center of rotation of the attachment/detachment section where the first fixture is arranged is the distance of the second fixture arranged behind the rotation direction of the attachment/detachment section from the first fixture. By making the distance longer than the distance from the center of rotation of the detachable portion, it is possible to increase the resistance against the rotational moment acting on the side opposite to the rotational direction of the divided portion from the driven gear that rotates in the opposite direction due to the rotation of the drive gear.

In addition, when the gear is a driven gear, the distance from the rotation center of the detachable part where the first fastener is arranged is the distance of the second fastener arranged behind the detachable part in the rotational direction from the first fastener. By shortening the distance from the center of rotation of the detachable portion, it is possible to increase the resistance against the rotational moment acting in the rotational direction of the divided portion caused by the rotation of another meshed gear.

In addition, by forming a gap between the divided portions arranged adjacent to each other, the divided portions are prevented from competing with each other, and the divided portions can be easily attached and detached.

In addition, by dividing the divided portion in the circumferential direction through the troughs of the teeth, damage to the teeth is prevented, and compared to the division between the ridges, the contact surface between the divided portions is reduced, making attachment and detachment easier. become.

The front view of the gear which shows the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of the gear which shows the 1st Embodiment of this invention. 1 is a front view of a stationary platen according to a first embodiment of the present invention; FIG. FIG. 4 is a rear view of the dividing portion according to the first embodiment of the present invention; The front view of the gear which shows the 2nd Embodiment of this invention. The front view of the gear which shows the 3rd Embodiment of this invention. The front view of the stationary platen which concerns on the 3rd Embodiment of this invention. The back view of the division|segmentation part which concerns on the 4th Embodiment of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, it cannot be overemphasized that this invention is not limited to embodiment.

[First embodiment]
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG.
FIG. 1 is a front view of a gear showing the first embodiment, FIG. 2 is a cross-sectional view of the gear showing the first embodiment, and FIG. 3 is a front view of a stationary platen according to the first embodiment. FIG. 4 is a rear view of the division part according to the first embodiment.

In the first embodiment, the gear 1 is a driving gear, and meshes with a driven gear (not shown) to rotate in the opposite direction.
As shown in FIGS. 1 and 2, the gear 1 includes a detachable portion 2 and a disk-shaped stationary platen 3 .
The attachment/detachment part 2 has a large number of teeth 4 on its outer circumference, and the teeth 4 are provided with peaks 41 and valleys 42 .

The detachable portion 2 is divided into a plurality of (eight in this embodiment) divided portions 5 at equal intervals in the circumferential direction. The number of divisions may be set so that at least one divided portion 5 that does not mesh with the teeth of the driven gear exists even when meshing with the driven gear.
The detachable portion 2 is divided along the dividing line extending in the radial direction, and by combining all the divided portions 5 in the circumferential direction, it is formed into a disc shape as a whole. The parting line passes through the trough 42 avoiding the peak 41 of the tooth 4 which receives a large force from the tooth of the driven gear. This is because if the teeth 4 are divided at the ridges 41 where the force of the meshing gears acts, the rigidity is lowered and the teeth 4 are likely to be damaged.
Also, when all the divided portions 5 are combined, a slight gap 7 is formed between the adjacent divided portions 5 .

The divided portion 5 is independently detachably fixed to one surface of the fixed platen 3 by bolts 8 inserted through the bolt holes 9 (see FIG. 3) of the fixed platen 3 and the bolt holes 10 (see FIG. 4) of the divided portion 5. be.
Two bolts 8 are provided for one divided portion 5, and these bolts are a first bolt 8a and a second bolt arranged behind the first bolt 8a in the rotational direction of the divided portion 5. 8b. The bolt 8, the first bolt 8a, and the second bolt 8b correspond to the fastener, first fastener, and second fastener of the present invention, respectively.

The distance from the center of rotation of the detachable portion 2 where the first bolt 8a is arranged differs from the distance from the center of rotation of the detachable portion 2 where the second bolt 8b is arranged.
By arranging in this way, even if a large force is applied to the teeth 4 in the rotation direction of the gear, it is possible to further prevent the split portion 5 from rattling with respect to the stationary platen 3 .

Specifically, the distance from the rotation center of the attachment/detachment portion 2 where the first bolt 8a is arranged is set to be longer than the distance from the rotation center of the attachment/detachment portion 2 where the second bolt 8b is arranged. .
As a result, the rotation of the gear 1, which is the drive gear, can increase the resistance to the rotational moment acting on the side opposite to the rotational direction of the divided portion 5 received from the driven gear, and can prevent looseness.

As shown in FIGS. 2 and 3 , the stationary platen 3 includes a cylindrical portion 30 for passing a shaft (not shown) and a circular brim-shaped fixing portion 31 for attaching the detachable portion 2 .
A fixing flange 32 is formed along the inner peripheral edge of one surface of the fixing portion 31 (the surface to which the detachable portion 2 is joined), and the inner peripheral surface of the fixing flange 32 is welded to the outer peripheral surface of the cylindrical portion 30. is fixed by

As shown in FIGS. 2 and 3, on one surface of the fixing portion 31, a circular convex portion 11 is formed along the entire outer peripheral edge, and as shown in FIG. A concave portion 12 that engages with the convex portion 11 of the stationary platen 3 is formed along the circumferential direction on the surface to be mounted.
When the inner peripheral surface of the divided portion 5 is brought into contact with the outer peripheral surface of the fixing flange 32, the divided portion 5 and the fixed platen 3 are positioned in the radial direction, and the convex portion 11 and the concave portion 12 can be easily engaged. The bolt holes 9, 10 are also easy to align.

Since the circular convex portion 11 is formed along the entire outer peripheral edge of the fixing portion 31, the convex portion 11 can be easily processed.
When the gear 1 is rotated to drive the driven gear, uneven forces are applied to the teeth 4 of the division 5, and the division 5 tends to rattle against the stationary platen 3, but the fixing mechanism extends in the circumferential direction. The convex part 11 of the board 3 and the concave part 12 of the divided part 5 are engaged to suppress rattling.

If any split portion 5 is worn or damaged, continue rotating the gear 1, move the split portion 5 to a position where it does not engage with the driven gear, pull out the first bolt 8a and the second bolt 8b, The worn/damaged division 5 is removed and a new division 5 is installed.
At this time, a gap 7 is formed between the divided portions 5 arranged adjacent to each other. Since the gap 7 is formed in this manner, the divided portion 5 can be easily removed without the adjacent divided portion 5 competing with the removed divided portion 5 and without being disturbed by the adjacent divided portion 5.例文帳に追加In addition, the mounting work can be performed without being disturbed by the adjacent divided portion 5. - 特許庁

[Second embodiment]
A second embodiment according to the present invention will be described below with reference to FIG. The description of the same parts as in the first embodiment will be omitted, and mainly the different parts will be described.

Gear 1 in the second embodiment is a driven gear and rotates with the rotation of another meshed gear (not shown).
Gear 1 rotates in the direction of the arrow shown in FIG. 5 as the other gears rotate. Therefore, a rotational moment in the direction of rotation of the divided portion 5 caused by the rotation of the other gear acts on the divided portion 5 .

Correspondingly, the distance from the rotation center of the detachable portion 2 where the first bolt 8a is arranged is set to The bolt 8 is arranged so as to be shorter than the distance from the center of rotation. By doing so, it is possible to increase the resistance against the rotational moment acting on the divided portion 5 in the rotational direction due to the rotation of the other gears.

[Third embodiment]
A third embodiment according to the present invention will be described with reference to FIGS. 6 and 7. FIG. The description of the same parts as those in the first or second embodiment will be omitted, and mainly the different parts will be described.

As shown in FIGS. 6 and 7, the outer shape of the fixed platen 3 is a regular polygon (regular octagon in this embodiment) having the same number of sides as the divided portions 5, and along the outer peripheral edge of the fixed platen 3 A regular polygonal convex portion 11 is formed.
As shown in FIG. 6, the recessed portions 12 provided on the joint surfaces of the split portion 5 are provided in a shape that is bent according to the shape of the convex portions 11 at the vertices of the regular octagon of the stationary platen 3. 5 are attached to the positions of the vertices of the regular octagon of the stationary platen 3 .
By constructing in this way and providing the protrusions 11 and the recesses 12 so as to include a straight line parallel to the tangent line of a circle concentric with the stationary platen 3 , the dividing portion 5 is arranged radially and circumferentially with respect to the stationary platen 3 . , the rattling of the divided portion 5 can be more reliably suppressed, and the alignment of the bolt holes 9 and 10 is further facilitated.

[Fourth Embodiment]
A fourth embodiment according to the present invention will be described with reference to FIG. Note that the description of the same parts as any of the first to third embodiments will be omitted, and mainly the different parts will be described.

4th Embodiment attaches the division|segmentation part 5 to the position of each side of a regular octagon to the stationary platen 3 of 3rd Embodiment.
As shown in FIG. 8 , recesses 12 that engage with the protrusions 11 of the fixed platen 3 are formed on the surface of the divided portion 5 that is joined to the fixed platen 3 . The concave portion 12 is provided in a straight line according to the shape of the convex portion 11 on each side of the regular octagon of the stationary platen 3, and the dividing portion 5 is attached to the position of each side of the regular octagon of the stationary platen 3. can be done.
With such a configuration, when the projection 11 and the recess 12 are provided so as to include a straight line parallel to the tangent line of a circle concentric with the stationary platen 3, the dividing portion 5 is positioned radially and circumferentially with respect to the stationary platen 3. Therefore, the rattling of the divided portion 5 can be more reliably suppressed, and the alignment of the bolt holes 9 and 10 is further facilitated.

[Other Modifications]
The present invention is not limited to the above embodiments. Examples include:

In this embodiment, the attachment/detachment portion is divided into eight divided portions, but the number of divisions can be appropriately changed depending on the size of the gear, the number of gears to be meshed, and the like.

In this embodiment, the fixed platen is formed with the convex portion and the divided portion is formed with the concave portion, but of course, the fixed platen may be formed with the concave portion and the partial wheel may be formed with the convex portion.

In the present embodiment, the circular convex portion 11 is formed along the entire outer peripheral edge of the fixing portion 31, but it is not limited to this. It may be intermittently provided instead of along the entire outer peripheral edge. Also, the protrusion may be formed on the inner joint surface instead of the outer peripheral edge. The shape of the convex portion is not limited to the embodiment either. In this embodiment, it is curved in the circumferential direction or provided in a regular polygonal shape, but it may be provided long in the radial direction. In that case, it is needless to say that the engaging concave portion is also formed in a corresponding position shape.

In this embodiment, each divided portion is attached to the stationary platen with two bolts, the first bolt and the second bolt, but it is not limited to this, and may be attached to the stationary platen with one bolt.

In this embodiment, each split portion is attached to the stationary platen with two bolts, the first bolt and the second bolt, but it may be attached with three or more bolts depending on the size of the split portion.

In the present embodiment, each divided portion is divided at the troughs, but in cases where deterioration in rigidity does not pose a problem, it may be divided at the peaks.

It is good also as an example by applying each technical matter in any embodiment to other embodiments.

REFERENCE SIGNS LIST 1 gear 2 attachment/detachment part 3 stationary platen 4 tooth 5 split part 7 gap 8 bolt 8a first bolt 8b second bolt 9, 10 bolt hole 30 cylindrical part 31 fixing part 32 fixing flange

Claims (7)

A detachable part having a large number of teeth on the outer peripheral surface and a stationary platen,
The detachable portion is divided into a plurality of divided portions in the circumferential direction, and each divided portion is detachably attached to the stationary platen by a fastener,
Among the joint surfaces of the fixed platen and the divided portion, a convex portion is formed along the entire outer peripheral edge of the fixed platen , and a concave portion is formed in the divided portion ,
A gear, wherein the convex portion and the concave portion are engaged with each other. A plurality of the fasteners detachably attach the divided portion to the stationary platen,
The plurality of fasteners have a first fastener and a second fastener arranged behind the first fastener in the rotational direction of the attachment/detachment section,
2. A distance from the center of rotation of the attachment/detachment section where the first fixture is arranged differs from a distance from the center of rotation of the attachment/detachment section where the second fixture is arranged. Gears described. A detachable part having a large number of teeth on the outer peripheral surface and a stationary platen,
The detachable portion is divided into a plurality of divided portions in the circumferential direction, and each divided portion is detachably attached to the stationary platen by a fastener,
A convex portion is formed on one of the joint surfaces of the stationary platen and the divided portion, and a concave portion is formed on the other;
the protrusion and the recess are engaged,
A plurality of the fasteners detachably attach the divided portion to the stationary platen,
The plurality of fasteners have a first fastener and a second fastener arranged behind the first fastener in the rotational direction of the attachment/detachment section,
The distance from the center of rotation of the attachment/detachment section where the first fixture is arranged differs from the distance from the center of rotation of the attachment/detachment section where the second fixture is arranged.
A gear characterized by: The gear is a drive gear,
The distance from the center of rotation of the attachment/detachment section where the first fixture is arranged is longer than the distance from the center of rotation of the attachment/detachment section where the second fixture is arranged. Item 3. The gear according to item 3 . The gear is a driven gear,
The distance from the center of rotation of the attachment/detachment section where the first fixture is arranged is shorter than the distance from the center of rotation of the attachment/detachment section where the second fixture is arranged. Item 3. A gear according to item 3 . 6. The gear according to any one of claims 1 to 5 , wherein a gap is formed between the adjacent divided portions. 7. A gear according to any one of the preceding claims, wherein the division is circumferentially divided through the roots of the teeth.

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