JP2020200920A - Chain sprocket wheel - Google Patents

Abstract

To provide a chain sprocket wheel which allows some partial wheels to be exchanged without stopping driving, and in which the partial wheels do not easily rattle with respect to the stationary board.SOLUTION: A chain sprocket wheel 1 drives a chain, engaged along an outer circumference, in a lengthwise direction, and includes a wheel part 2 having many teeth 4 with which the chain engages, and a stationary board 3. The wheel part 2 is divided into a plurality of partial wheels 5 in a circumferential direction. Each partial wheel 5 is individually exchangeably attached to the stationary board 3. The stationary board 3 has an abutment surface 33 which comes into abutment with an inner peripheral surface of the partial wheel 5 to restrict rotation of the partial wheel 5 in the circumferential direction relative to the stationary board 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a chain sprocket wheel that moves a chain hung on the outer circumference in the length direction.

A plurality of chain sprocket wheels of a general chain mechanism are arranged, a chain is hung on the outer circumference thereof, at least one chain sprocket wheel is rotated by a drive device, and the rotational force is transmitted to the chain in the length direction. It is designed to be moved.
Since the chain is engaged with a part of the teeth of the chain sprocket wheel, a large load is applied to these teeth, which is liable to be damaged or worn. In particular, in a chain conveyor for transporting heavy objects and a chain mechanism of a sludge scraping device, the teeth are severely damaged, so that the chain sprocket wheel is frequently replaced. At this time, replacing the entire large chain sprocket wheel not only required a large amount of labor and working time, but was also very costly.
The same applies to the driven chain sprocket wheel.

Therefore, conventionally, Patent Document 1 discloses a chain sprocket wheel which is composed of a wheel main body and a fixing plate for attaching and fixing the wheel main body, and the wheel main body is formed into a replaceable split type.
In such a split type chain sprocket wheel, when a tooth is partially damaged or worn out and cannot be used, a part of the split piece of the wheel body is left while the chain is hung. It can be repaired just by replacing it.

JP-A-2002-356217

However, in a chain sprocket wheel as described in Patent Document 1, since the split piece and the fixing plate of the wheel body are attached and fixed only by bolts and nuts, when a large force is applied to a part of the teeth, the split piece There was a risk that the wheel would rattle against the fixed plate and the force would not be sufficiently transmitted to and from the chain.
An object to be solved by the present invention is to provide a chain sprocket wheel in which only a part of a partial wheel can be replaced without removing the chain and the partial wheel does not rattle with respect to a fixed plate. ..

The invention according to claim 1 of the present application is a chain sprocket wheel that hangs a chain on the outer circumference, and includes a wheel portion having a large number of teeth on which the chain engages and a fixing plate, and the wheel portion is provided in the circumferential direction. It is divided into a plurality of partial wheels, and each partial wheel is detachably joined to the fixing plate by a fixing tool, and the fixing plate is in contact with the inner peripheral surface of the partial wheel to be in contact with the fixing plate of the partial wheel. It is a chain sprocket wheel characterized in that a contact surface for restricting rotation in the circumferential direction is formed.

In the invention according to claim 2 of the present application, a convex portion is formed on one of the joint surfaces of the fixed plate and the partial wheel, and a concave portion is formed on the other, and the convex portion and the concave portion engage with each other. The chain sprocket wheel according to claim 1, wherein the chain sprocket wheel is characterized in that.

In the invention according to claim 3 of the present application, there are a plurality of the fixing tools for detachably attaching the partial wheel to the fixing plate, and the plurality of fixing tools are more than the first fixing tool and the first fixing tool. It has a second fixing tool arranged rearward in the rotation direction of the partial wheel, the distance from the rotation center of the wheel portion on which the first fixing tool is arranged, and the second fixing tool arranged. The chain sprocket wheel according to claim 1 or 2, wherein the distance from the center of rotation of the wheel portion is different.

In the invention according to claim 4 of the present application, the chain sprocket wheel is a drive chain sprocket wheel, and the second fastener is arranged at a distance from the rotation center of the wheel portion on which the first fastener is arranged. The chain sprocket wheel according to claim 3, wherein the distance from the rotation center of the wheel portion is longer than that of the wheel portion.

According to the fifth aspect of the present application, the chain sprocket wheel is a driven chain sprocket wheel, and the second fastener is arranged at a distance from the rotation center of the wheel portion on which the first fastener is arranged. The chain sprocket wheel according to claim 3, wherein the distance from the rotation center of the wheel portion is shorter than that of the wheel portion.

The invention according to claim 6 of the present application is the chain sprocket wheel according to any one of claims 1 to 5, wherein a gap is formed between the adjacent partial wheels. is there.

The chain according to claim 7, wherein the wheel portion is divided in the circumferential direction through the valley portion of the tooth, and the chain according to any one of claims 1 to 6. It is a sprocket wheel.

According to the present invention, if any of the partial wheels fails, the partial wheel is moved to a position where it does not engage with the chain, and only the worn or damaged partial wheel can be easily replaced without removing the chain. This makes it possible to significantly reduce the labor and cost required for replacement.
Further, since the fixed plate is formed with a contact surface that comes into contact with the inner peripheral surface of the partial wheel to regulate the rotation of the partial wheel in the circumferential direction, the rotation of the partial wheel 5 with respect to the fixed plate 3 in the circumferential direction is restricted. The partial wheel 5 does not rattle and is stably fixed.

In addition, by engaging the concave portion and the convex portion formed on the joint surface between the partial wheel and the fixing plate joined by the fixing tool, the partial wheel is fixed even if a large force is applied to a part of the tooth. It is possible to prevent rattling on the board.

In addition, the number of fixing tools for detachably attaching the partial wheel to the fixing plate is at least a plurality of the first fixing tool and the second fixing tool arranged behind the first fixing tool in the rotation direction of the partial wheel. By making the distance from the rotation center of the wheel part to be arranged different from the distance from the rotation center of the wheel part where the second fastener is arranged, a large force is applied to the teeth in the movable direction of the chain. However, the partial wheel can further prevent rattling with respect to the fixed plate.

In addition, when the chain sprocket wheel is a drive chain sprocket wheel, the distance from the rotation center of the wheel portion on which the first fixing tool is arranged is set to the rear of the first fixing tool in the rotation direction of the wheel. By making the distance from the rotation center of the wheel portion of the fastener longer than the distance from the rotation center, it is possible to increase the resistance to the rotational moment acting on the opposite side of the rotation direction of the partial wheel from the chain caused by the rotation of the drive chain sprocket wheel.

In addition, when the chain sprocket wheel is a driven chain sprocket wheel, the distance from the rotation center of the wheel portion on which the first fixing tool is arranged is set to the rear of the first fixing tool in the rotation direction of the wheel. By making the distance from the rotation center of the wheel portion of the fastener shorter than the distance from the center of rotation, it is possible to increase the resistance to the rotational moment acting in the rotational direction of the partial wheel from the chain caused by the movement of the chain.

In addition, by forming a gap between the partial wheels arranged adjacent to each other, it is possible to prevent the partial holes from competing with each other and facilitate the attachment / detachment of the partial wheels.

In addition, since the wheel portion is divided in the circumferential direction through the valley portion of the tooth, the contact surface is reduced and the attachment / detachment becomes easier as compared with the division between the peak portions.

The front view of the chain sprocket wheel which shows the 1st Embodiment of this invention. FIG. 3 is a cross-sectional view of a chain sprocket wheel showing a first embodiment of the present invention. The front view of the fixing plate which concerns on 1st Embodiment of this invention. The rear view of the partial wheel which concerns on 1st Embodiment of this invention. The front view of the chain sprocket wheel which shows the 2nd Embodiment of this invention. The front view of the chain sprocket wheel which shows the 3rd Embodiment of this invention. The figure explaining the effect in 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Needless to say, the present invention is not limited to the embodiments.

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 is a front view of the chain sprocket wheel showing the first embodiment, FIG. 2 is a cross-sectional view of the chain sprocket wheel showing the first embodiment, and FIG. 3 is a fixing plate according to the first embodiment. FIG. 4 is a rear view of the partial wheel according to the first embodiment.

In the first embodiment, the chain sprocket wheel 1 is a drive chain sprocket wheel that moves a chain (not shown) spanning the outer circumference in the longitudinal direction.
As shown in FIGS. 1 and 2, the chain sprocket wheel 1 includes a wheel portion 2 and a disk-shaped fixing plate 3.
The wheel portion 2 has a large number of teeth 4 with which a chain is engaged on the outer periphery thereof, and the teeth 4 include peak portions 41 and valley portions 42. Further, the inner peripheral surface of the wheel portion 2 has a regular polygonal shape (a regular octagonal shape in this embodiment).

The wheel portion 2 is divided into a plurality of (8 in this embodiment) partial wheels 5 at equal intervals in the circumferential direction. This number of divisions may be set as the number of divisions so that at least one partial wheel 5 with which the chain does not engage can exist even when the chain is hung in a U-turn shape.
The wheel portion 2 is divided along a dividing line extending in the radial direction through the peak portion 41 of the tooth 4 and the apex of the regular polygon formed on the inner circumference of the wheel portion 2, and all the partial wheels 5 are provided in the circumferential direction. By combining with, it is formed into a disk shape as a whole. Further, when all the partial wheels 5 are combined, a slight gap 7 is formed between the adjacent partial wheels 5.

The partial wheel 5 is independently detachably joined to one surface of the fixing plate 3 by a bolt 8 inserted into a bolt hole 9 (see FIG. 3) of the fixing plate 3 and a bolt hole 10 (see FIG. 4) of the partial wheel 5. Wheel.
Two bolts 8 are provided for one partial wheel 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 partial wheel 5. It is composed of 8b. The bolt 8, the first bolt 8a, and the second bolt 8b correspond to the fixing tool, the first fixing tool, and the second fixing tool of the present invention, respectively.

The distance from the rotation center of the wheel portion 2 where the first bolt 8a is arranged and the distance from the rotation center of the wheel portion 2 where the second bolt 8b is arranged are different.
By arranging in this way, even if a large force is applied to the teeth 4 in the movable direction of the chain, the partial wheel 5 can further prevent rattling with respect to the fixed plate 3.

Specifically, the distance from the rotation center of the wheel portion 2 where the first bolt 8a is arranged is set to be longer than the distance from the rotation center of the wheel portion 2 where the second bolt 8b is arranged. ..
As a result, since it is a drive chain sprocket wheel, it is possible to increase the resistance to a rotational moment acting on the opposite side of the rotation direction of the partial wheel 5 from the chain caused by the rotation of the chain sprocket wheel 1 to prevent rattling. Can be done.

As shown in FIGS. 2 and 3, the fixing plate 3 includes a tubular portion 30 for passing a shaft (not shown) and a circular collar-shaped wheel fixing portion 31 for attaching the wheel portion 2.
A fixing flange 32 is formed along the inner peripheral edge on one surface of the wheel fixing portion 31 (the surface to which the wheel portion 2 is joined), and the inner peripheral surface of the fixing flange 32 is welded to the outer peripheral surface of the tubular portion 30. Is fixed by.
Further, the outer peripheral surface of the fixing flange 32 has a regular polygonal shape (regular octagonal shape in the present embodiment) corresponding to the inner peripheral surface of the wheel portion 2, and a plurality of abutment to the inner peripheral surface of each partial wheel 5. Contact surfaces (8 in this embodiment) are formed.

As shown in FIGS. 2 and 3, a circular convex portion 11 is formed on one surface of the wheel fixing portion 31 along the entire outer peripheral edge, and as shown in FIG. 4, the fixing plate 3 of the partial wheel 5 is formed. A concave portion 12 that engages with the convex portion 11 of the fixing plate 3 is formed on the surface to be joined along the circumferential direction.
When the inner peripheral surface of the partial wheel 5 is brought into contact with the contact surface 33 of the fixing flange 32, the partial wheel 5 and the fixing plate 3 are positioned in the radial direction, and the convex portion 11 and the concave portion 12 can be easily engaged. At the same time, the bolt holes 9 and 10 can be easily aligned. Further, since the inner peripheral surface of the partial wheel 5 and the contact surface 33 of the fixed plate 3 are flat surfaces, the rotation of the partial wheel 5 with respect to the fixed plate 3 in the circumferential direction is restricted when they are brought into contact with each other.

Since the circular convex portion 11 is formed along the entire outer peripheral edge of the wheel fixing portion 31, it is easy to process the convex portion 11.
When the chain sprocket wheel 1 is rotated to drive the chain, an uneven force is applied to the teeth 4 of the partial wheel 5, and the partial wheel 5 tries to rattle against the fixed plate 3, but extends in the circumferential direction. The convex portion 11 of the fixing plate 3 and the concave portion 12 of the partial wheel 5 are engaged with each other to suppress rattling.
Further, since the inner peripheral surface of the partial wheel 5 and the contact surface of the fixing plate 3 are flat and parallel to the tangent line of the circle concentric with the wheel portion 2, the inner peripheral surface of the partial wheel 5 is the contact surface of the fixing plate 3. When it comes into contact with 33, the movement of the partial wheel 5 with respect to the fixing plate 3 in the circumferential direction is restricted, and the rattling of the partial wheel 5 can be further suppressed.

If any of the partial wheels 5 is worn or damaged, the partial wheels 5 are moved to a position where they do not engage with the chain without removing the chain from the chain sprocket wheel 1, and the first bolt 8a and the second bolt 8b are moved. The partial wheel 5 that has been pulled out, worn or damaged is removed, and a new partial wheel 5 is attached.
At this time, a gap 7 is formed between the partial wheels 5 arranged adjacent to each other. Since the gap 7 is formed in this way, the partial wheel 5 can be easily removed without competing with the adjacent partial wheel 5 and without being disturbed by the adjacent partial wheel 5. Further, even in the installation, the work can be performed without being disturbed by the adjacent partial wheel 5.

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

The chain sprocket wheel 1 in the second embodiment is a driven chain sprocket wheel, and rotates as the chain (not shown) hung on the outer circumference moves.
The chain sprocket wheel 1 rotates in the direction of the arrow shown in FIG. 5 as the chain moves. Therefore, a rotational moment in the rotational direction of the partial wheel from the chain generated by the movement of the chain acts on the partial wheel 5.

Correspondingly, the distance from the rotation center of the wheel portion 2 where the first bolt 8a is arranged is set to the wheel portion 2 of the second bolt 8b which is arranged behind the first bolt 8a in the rotation direction of the wheel portion 2. The bolt 8 is arranged shorter than the distance from the center of rotation. By doing so, it is possible to increase the yield strength against the rotational moment acting in the rotational direction of the partial wheel 5 from the chain caused by the movement of the chain.

[Third Embodiment]
Hereinafter, a third embodiment according to the present invention will be described together with FIGS. 6 and 7. The same parts as those in the first and second embodiments will be omitted, and different parts will be mainly described.

In the third embodiment, the wheel portion 2 is divided into a plurality of partial wheels 5 along a dividing line extending in the radial direction through the valley portion 42 of the tooth 4.
When the wheel portion 2 is divided by the valley portion 42 of the tooth 4 in this way, the strength is slightly lower than that divided by the mountain portion 41 and the partial wheels 5 are easily opened. Since the portion that can come into contact with the partially arranged partial wheels 5 is reduced, the adjacently arranged partial wheels 5 do not get in the way and can be easily attached and detached. Further, as compared with the one divided by the mountain portion 41, the portion that can come into contact with the adjacent partial wheel 5 is reduced during attachment / detachment, so that the possibility of pinching a finger is reduced and safe attachment / detachment work is performed. be able to.

The eight attached partial wheels 5 are provided so as to be flush with the joint surface of the wheel fixing portion 31, but there is a step between the adjacent partial wheels 5 when attaching and detaching. May occur. Even in such a case, if the plurality of partial wheels 5 are divided along the dividing line extending in the radial direction through the valley portion 42 of the tooth 4, the presence of a step on the movement of the chain has an effect. It can be made smaller and contributes to the smooth movement of the chain. This effect will be specifically described with reference to FIG.
FIG. 7 is a view for explaining this effect, and FIG. 7A is an enlarged plan view of a portion of the wheel portion 2 divided by the mountain portion 41 of the tooth 4 (viewed from the direction A in FIG. 5). ), FIG. 7 (b) shows a third embodiment, which is an enlarged plan view of a portion of the wheel portion 2 divided by the valley portion 42 of the tooth 4 (viewed from the B direction in FIG. 6). Is.

When a step Z occurs in the adjacent partial wheels 5 and 5 arranged through the gap 7, the distance of the divided mountain portion 41 with respect to the step Z is as shown in FIG. 7 (a) of the tooth 4. In the case of being divided by the mountain portion 41, the distance of the divided mountain portion 41 is L1 of the gap 7. On the other hand, in the case where the teeth 4 are divided by the valleys 42 as shown in FIG. 7B, the distance between the divided peaks 41 is L2, which is larger than the gap 7 by the valleys 42 and 42 minutes. In the case of being divided by 42, the distance at which the same step Z of the mountain portion 41 occurs becomes longer.
From this, the influence of the step of the mountain portion 41 on the chain is relatively smaller in the case of being divided by the valley portion 42 of FIG. 7 (b). Moreover, in the case of being divided by the mountain portion 41 of FIG. 7 (a), a step Z is generated between the mountain portions 41 engaged with one hole of the chain, but the step Z is divided by the valley portion 42 of FIG. 7 (b). In this case, a step Z is generated between the mountain portions 41 that engage with the two holes of the chain, and the influence of the step on the chain is reduced.

[Other variants]
The present invention is not limited to the above embodiments. For example, the following are also included.

In the present embodiment, the wheel portion is divided into eight partial wheels, but the number of divisions can be appropriately changed depending on the size of the chain sprocket wheel, the angle at which the chains are engaged, and the like. Along with this, a number of contact surfaces corresponding to the number of partial wheels are formed on the outer peripheral surface of the fixing flange of the fixing plate.

In the present embodiment, the inner peripheral surface of the partial wheel and the contact surface of the fixed plate are flat, but any shape that restricts the movement of the partial wheel in the circumferential direction may be used, such as a bent surface or an uneven surface. You can also do it.

In the present embodiment, the contact surface 33 is formed on the outer peripheral surface of the fixing flange 32 of the wheel fixing portion 31 fixed to the outer peripheral surface of the tubular portion 30 of the fixing plate 3, but the present invention is not limited to this. When there is no fixing flange and the inner peripheral surface of the partial wheel is in direct contact with the outer peripheral surface of the tubular portion, a contact surface is formed on the outer peripheral surface of the tubular portion.

In the present embodiment, the contact surface is a surface where the outer peripheral surface on the fixed plate side and the inner peripheral surface of the partial wheel are in contact with each other, but the contact surface is not limited to the one that is in constant contact with the contact surface. For example, when the partial wheel is joined to the fixed plate, even if there is a slight gap, a force acts on the partial wheel and after a slight movement in the circumferential direction, it comes into contact with the outer peripheral surface on the fixed plate side. The case where the movement is restricted is also included in the contact surface of the present invention.

In the present embodiment, a convex portion is formed on the fixed plate and a concave portion is formed on the partial wheel, but of course, a concave portion may be formed on the fixed plate and a convex portion may be formed on the partial wheel.

In the present embodiment, the circular convex portion 11 is formed along the entire outer peripheral edge of the wheel fixing portion 31, but the present invention is not limited to this. It may be provided intermittently rather than along the entire outer periphery. Further, a convex portion may be formed on the inner joint surface instead of the outer peripheral edge. Further, in that case, it goes without saying that the engaging recess is also formed at the corresponding position.

In the present embodiment, each partial wheel is attached to the fixing plate with two bolts, the first bolt and the second bolt, but the present invention is not limited to this, and one bolt may be attached to the fixing plate.

In the present embodiment, each partial wheel is attached to the fixing plate 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 partial wheel.

Although the present invention relates to the structure of a chain sprocket wheel, the technical idea described in the present specification may be applied to the structure of a gear to invent the gear. In this case, it is not the chain but the teeth of the other gear that engage the many teeth.

Each technical matter in any embodiment may be applied to other embodiments as an embodiment.

1 Chain sprocket wheel 2 Wheel part 3 Fixing plate 4 Tooth 5 Part wheel 7 Gap 8 Bolt 8a 1st bolt 8b 2nd bolt 9,10 Bolt hole 30 Cylindrical part 31 Wheel fixing part 32 Fixing flange 33 Contact surface

Claims (7)

A chain sprocket wheel that hangs the chain around the circumference
A wheel portion having a large number of teeth to which the chain is engaged and a fixing plate are provided.
The wheel portion is divided into a plurality of partial wheels in the circumferential direction, and each partial wheel is detachably joined to the fixing plate by a fixing tool.
The chain sprocket wheel is characterized in that the fixed plate is in contact with the inner peripheral surface of the partial wheel to form a contact surface that regulates the rotation of the partial wheel in the circumferential direction with respect to the fixed plate. The first aspect of the present invention, wherein a convex portion is formed on one of the joint surfaces of the fixing plate and the partial wheel, and a concave portion is formed on the other, and the convex portion and the concave portion engage with each other. Chain sprocket wheel. There are a plurality of the fixing tools for attaching and detaching the partial wheel to the fixing plate.
The plurality of fixing tools include a first fixing tool and a second fixing tool arranged behind the first fixing tool in the rotational direction of the partial wheel.
1 or claim 1, wherein the distance from the rotation center of the wheel portion on which the first fixing tool is arranged is different from the distance from the rotation center of the wheel portion on which the second fixing tool is arranged. The chain sprocket wheel according to 2. The chain sprocket wheel is a drive chain sprocket wheel.
The third aspect of claim 3, wherein the distance from the rotation center of the wheel portion on which the first fastener is arranged is longer than the distance from the rotation center of the wheel portion on which the second fastener is arranged. Chain sprocket wheel. The chain sprocket wheel is a driven chain sprocket wheel.
The third aspect of claim 3, wherein the distance from the rotation center of the wheel portion on which the first fixing tool is arranged is shorter than the distance from the rotation center of the wheel portion on which the second fixing tool is arranged. Chain sprocket wheel. The chain sprocket wheel according to any one of claims 1 to 5, wherein a gap is formed between the adjacent partial wheels. The chain sprocket wheel according to any one of claims 1 to 6, wherein the wheel portion is divided in the circumferential direction through the valley portion of the tooth.

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