KR101725201B1

KR101725201B1 - Chain sprocket having noise reduction portion

Info

Publication number: KR101725201B1
Application number: KR1020150136833A
Authority: KR
Inventors: 허용수; 오명훈; 최정식
Original assignee: 한국에스케이에프씰 주식회사
Priority date: 2015-09-25
Filing date: 2015-09-25
Publication date: 2017-04-11
Also published as: KR20170037351A

Abstract

A chain sprocket comprising a chain plate and a chain bush having a hinge shaft, the chain sprocket being rotatable in engagement with a timing chain, the chain sprocket comprising a cylindrical body, And a noise reduction unit disposed between the periphery of the chain plate and the chain plate. The noise reduction unit is made of a rubber material, do.
Therefore, since the noise reduction part is integrally formed in the sprocket, the structure is simple, so that the productivity is improved, the manufacturing cost is reduced, the noise reduction effect is improved, and the durability is not easily deteriorated.

Description

CHAIN SPROCKET HAVING NOISE REDUCTION PORTION WITH NOISE REDUCTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain sprocket having a noise reduction part, and more particularly, to a chain sprocket having a noise reduction part, which is configured to reduce noise generated when a timing chain and a chain sprocket are engaged and rotated.

An O-ring made of an elastic material is used to reduce the noise generated when the conventional timing chain 10 and the chain sprocket are engaged and rotated, as shown in FIGS. 1 and 2. FIG.

The timing chain 10 is composed of a chain plate 11 and a chain bushing 12. The sprocket 1 is formed with ring grooves 5 on the circumferential surface 3 on both sides of the sprocket teeth 2, (5) is fitted with an O-ring (4).

The O-ring 4 is made of a rubber material having elasticity and durability and the chain plate 11 is brought into contact when the timing chain 10 is engaged with the O-ring 4, ) And the sprocket (1) are engaged with each other and the noise generated when the sprocket (1) is rotated is reduced.

However, since the sprocket 1 having the above-described structure requires the ring groove 5 in which the O-ring 4 is held to be formed on the circumferential surface 3 on both sides of the sprocket teeth 2, the productivity is low, There is a problem that the manufacturing unit cost becomes high.

In addition, since the O-ring is a simple shape having a circular cross section mounted on the sprocket 1, there is a problem that the noise generated when the timing chain 10 and the sprocket 1 are engaged and rotated can not be effectively reduced.

In addition, when the timing chain 10 and the sprocket 1 are rotated at high speed, durability is easily deteriorated.

Therefore, it is necessary to improve these problems.

(Document 1) Korean Patent Publication No. 10-2003-0018526 (Mar. 06, 2003)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a chain sprocket having a simple structure.

Further, it is an object of the present invention to provide a chain sprocket which can effectively reduce noises generated in the process of engagement of a timing chain and a sprocket, and which does not easily deteriorate durability even when the timing chain and the sprocket rotate at high speed.

A chain sprocket having a noise reduction part according to the present invention is a chain sprocket rotated in engagement with a timing chain composed of a chain plate and a chain bush having a hinge shaft, the chain sprocket comprising a cylindrical body part, And a noise reduction unit disposed between the periphery and the chain plate. The noise reduction unit is made of a rubber material, and the noise reduction unit is made of a rubber material .

Preferably, a plurality of protrusions are formed on the outer surface of the noise reduction portion in the circumferential direction of the body portion, and the protrusions are protruded in the radial direction of the body portion.

At this time, a first plane that comes into surface contact with the chain plate may be formed at an upper end of the protrusion.

The protrusions may be formed with a pair of second planes extending downward at both ends of the first plane.

A pair of first curved surfaces may be formed at a portion where the first plane and the pair of second planes meet.

A pair of second curved surfaces may be formed at a portion where the pair of the second planes meet the outer surface of the noise reduction portion.

At least one depression recessed in the radial direction of the body may be formed on the first plane.

The chain sprocket provided with the noise reduction part according to the present invention has a simple structure because the noise reduction part is integrally formed in the sprocket, thereby improving the productivity and reducing the manufacturing cost.

In addition, it is possible to form the protrusions on the noise reduction portion and to form a plurality of planes and curved surfaces on the protrusions, thereby effectively reducing noise generated when the timing chain and the sprocket engage with each other. When the timing chain and the sprocket rotate at high speed The durability is not easily deteriorated.

1 is a sectional view of a chain sprocket according to the background art;
2 is a side view of a chain sprocket according to the background art;
3 is a perspective view of a chain sprocket according to the present invention;
4 is a side view showing the timing chain and the chain sprocket according to the present invention engaged.
FIGS. 5 and 6 are enlarged side views of the protrusions of the chain sprocket according to the present invention, FIG. 5 is a view showing protrusions according to an embodiment, and FIG. 6 is a view showing protrusions according to another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a perspective view of a chain sprocket according to the present invention, FIG. 4 is a side view showing a timing chain and a chain sprocket according to the present invention engaged, and FIGS. 5 and 6 are enlarged views 5 is a view showing a protrusion according to an embodiment, and Fig. 6 is a view showing a protrusion according to another embodiment.

3 and 4, a chain sprocket with a noise reduction unit according to the present invention will be described.

The present invention relates to a chain sprocket 20 which rotates in engagement with a timing chain 10 constituted by a chain plate 11 and a chain bush 12 having a hinge shaft. The chain sprocket 20 includes a cylindrical body 100, And includes a latching part 200 for receiving the chain bush 12 and a peripheral part 300 on both sides of the latching part 200 on which the chain plate 11 is seated, And a noise reduction unit 400 disposed between the chain plate 11 and the chain plate 11. The noise reduction unit 400 is made of a rubber material.

Generally, the whine noise of the timing chain 10 is such that when the timing chain 10 enters the chain sprocket 20, the impact energy of the chain bush 12 and the sprocket 20 is generated as noise.

In the present embodiment, the noise reduction unit 400 is provided at a portion where the chain plate 11 and the sprocket 20 collide with each other to reduce noise. The noise reduction unit 400 is made of an elastic material, .

In addition, in the present embodiment, a plurality of protrusions 410 are formed on the outer surface of the noise reduction unit 400. The protrusion 410 is formed along the circumferential direction P of the cylindrical body portion 100.

At this time, the protrusion 410 is preferably protruded in the radial direction R of the body 100. With this configuration, the distance between the chain plate 11 and the noise reduction unit 400 is shortened, and noise can be effectively reduced.

5 and 6 are enlarged side views of the protrusions of the chain sprocket according to the present invention, FIG. 5 is a view showing protrusions according to an embodiment, FIG. 6 is a view showing protrusions according to another embodiment, Together.

According to the present embodiment, a first plane 411 may be formed on the upper surface of the protrusion 410 so as to be in surface contact with the chain plate 11.

When the first plane 411 is formed on the upper end of the protrusion 410 as described above, the chain plate 11 and the protrusion 410 are in surface contact with each other. As a result, the effect of dispersion of the load per unit area is large, Can be reduced. In addition, there is an effect that the durability is not lowered even at high speed rotation.

In this embodiment, a pair of second planes 412 extending downward from both ends of the first plane 411 are formed on the protrusions 410.

The second plane 412 serves to support the protrusion 410 by preventing the protrusion 410 from being pushed by a predetermined amount even when the protrusion 410 is pressed by the chain plate 11 due to material properties. That is, since the pair of second planes 412 are provided, it is possible to prevent the durability of the projection 410 from being deteriorated.

In this embodiment, a pair of first curved surfaces 413 is formed at a portion where the first plane 411 and the pair of second planes 412 meet. When the first curved surface 413 is formed as described above, a large force is applied to the protrusion 410 at a high rotation speed, thereby supporting the protrusion 410 so as not to be pressed over a predetermined amount even when the protrusion 410 is pressed. 410 is prevented from deteriorating in durability.

In this embodiment, a pair of second curved surfaces 414 are formed at a portion where the pair of second planes 412 and the outer surface of the noise reducing portion 410 meet.

As described above, when the second curved surface 414 is formed, even if a large force is applied to the protrusion 410 due to high-speed rotation, the protrusion 410 effectively supports the chain plate 11, And the durability of the projection 410 can be prevented from decreasing.

6, at least one depression 411a recessed in the radial direction R of the body 100 is formed on the first plane 411 according to another embodiment of the present invention.

As described above, the first plane 411 is provided to apply the load of the chain plate 11 to the protrusion 410 in a dispersed state. That is, as the contact area between the chain plate 11 and the protrusion 410 increases, the load is more smoothly dispersed.

When the chain plate 11 presses the protrusion 410 in a state where the depression 411a is formed on the first plane 411 as in the present embodiment, the protrusion 410 located on both sides of the depression 411a The upper end of the protrusion 410 is pressed down to the lower end of the depression 411a so that the inner surface of the depression 411a also supports the chain plate 11, As a result, the contact area between the chain plate 11 and the protrusion 410 is increased, and the load is distributed more smoothly.

Comparison result in no-lubrication condition

Rotation speed
(RPM)
Noise measurement result (dB)

Conventional technology

Invention of the present invention

1,500
97.5
91.5
1,600
97.8
94.2
1,700
98.1
95.8
1,800
98.0
95.6
1,900
98.6
95.3
2,000
100.2
96.3
2,100
99.0
96.5
2,200
99.4
97.7
2,300
100.2
97.2
2,400
100.4
97.5

Comparison results in lubrication conditions
Rotation speed
(RPM)
Noise measurement result (dB)

Conventional technology

Invention of the present invention

1,500

95.0
90.3
1,600

95.6
92.0
1,700

96.0
97.5
1,800

96.3
94.7
1,900

97.0
95.6
2,000

99.3
95.7
2,100

98.0
95.4
2,200

98.5
96.2
2,300

98.0
96.8
2,400

98.5
96.9

Table 1 and Table 2 show the results of noise measurements for no-lubrication condition and lubrication condition, respectively. As can be seen from Tables 1 and 2, it can be seen that the present invention has a noise reduction effect of at least 1.6% to at most 6% compared to the prior art.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it should be understood that the embodiments disclosed herein are not intended to limit the scope of the present invention, but rather to illustrate the present invention, and thus the scope of the present invention is not limited by these embodiments. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Timing Chain 11: Chain Plate
12: Chain Bush
100: body part 200:
300: circumference part 400: noise reduction part
410: protrusion 411: first plane
412: second plane 413: first curved surface
414: second curved surface
P: circumferential direction of the body portion R: radial direction of the body portion

Claims

A chain sprocket (20) which rotates in engagement with a timing chain (10) composed of a chain plate (11) and a chain bush (12) with a hinge shaft,
A cylindrical body portion 100;
A latching part 200 formed on the body part 100 to receive the chain bushing 12;
A circumferential portion 300 provided at both sides of the latch portion 200 and on which the chain plate 11 is seated;
And a noise reduction part (400) disposed between the peripheral part (300) and the chain plate (11)
The noise reduction unit 400 is made of rubber and a plurality of protrusions 410 are formed on the outer surface of the noise reduction unit 400 in the circumferential direction P of the body 100,
The protrusion 410 protrudes in the radial direction R of the body 100;
A first plane 411 is formed on the upper surface of the protrusion 410 so as to be in surface contact with the chain plate 11;
A pair of second planes 412 extending downward from both ends of the first plane 411 are formed on the protrusion 410;
A pair of first curved surfaces 413 is formed at a portion where the first plane 411 and the pair of second planes 412 meet;
A pair of second curved surfaces 414 are formed at a portion where the pair of the second planes 412 and the outer surface of the noise reducing portion 400 meet;
Wherein at least one depression (411a) recessed in the radial direction (R) of the body (100) is formed on the first plane (411).

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