CN212717817U - Novel silent chain - Google Patents
Novel silent chain Download PDFInfo
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- CN212717817U CN212717817U CN202020798880.2U CN202020798880U CN212717817U CN 212717817 U CN212717817 U CN 212717817U CN 202020798880 U CN202020798880 U CN 202020798880U CN 212717817 U CN212717817 U CN 212717817U
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Abstract
The utility model discloses a novel silence chain, its technical scheme: the chain consists of a working chain plate, a pin shaft connected with the working chain plate and a guide plate, wherein the pin shaft is inserted into the working chain plate and is in interference fit with the guide plate; the pretension force is 60-90% of the breaking load of the chain, and the pretension holding time is 0-120 seconds; the working chain plate can increase the contact area of the hinge and effectively reduce the contact stress of the hinge by reducing the fit clearance between the working chain plate and the pin shaft on the premise of not reducing the strength of the chain plate, thereby obtaining the best wear resistance. The design increases the oil storage space, promotes the production efficiency of silence chain, can effectively promote chain drive system's life.
Description
Technical Field
The utility model relates to a chain technical field, especially a novel silence chain.
Background
The silent chain is widely used for high-speed transmission engine timing systems of automobiles, motorcycles and the like. Compared with a roller chain, the mute chain has better NVH characteristic, can effectively reduce the noise of a chain transmission system, and improves the sound quality. The silent chain is composed of a plurality of same guide plates, working chain plates and connecting pin shafts. Because there is certain limitation in structural design in traditional silence chain, can influence wear resistance. As shown in fig. 1, in the conventional working link plate of the silent chain, the pin shaft and the working link plate are in shaft hole clearance fit, the pin hole is of a standard circular structure, the radius of curvature of the circular arc of the pin shaft inserted into the pin hole of the link plate is R1', the radius of curvature of the circular arc of the pin hole of the link plate is R2', in order to ensure that the pin shaft can be loosely inserted into the pin hole of the link plate, R1' and R2' need to satisfy a relational expression, R2' + N ', and N ' ═ 0.02-0.04, although the problems of assembly quality and efficiency of the silent chain can be fundamentally solved, the center of curvature of the circular arc of the pin hole of the pin shaft is the pitch center of the chain, the center of curvature of the circular arc of the pin hole of the pin shaft and the pitch center of the chain are on the same straight line, and the clearance between the pin shaft and the pin hole is large.
Because of the improvement of global energy conservation and environmental awareness, the automobile tends to be light in weight, and the engine is more and more compact, the timing chain of the engine is required to be designed to be as small as possible, so that the difficulty in producing and manufacturing the chain is greatly increased. The main dimension of the silent chain is called pitch, and the specifications of the silent chain are as follows: 6.35mm, 8mm, 9.525mm and the like. The fit clearance of the pin holes of the silent chain is designed to be smaller, the precision is higher, the manufacturing difficulty is higher, the pin shafts and the chain plate holes are easily extruded and cut, and defective products such as eyebrow-shaped scrap irons, tight joints, dead joints and the like are generated. The existence of the iron chips can compress an oil storage space of the pin hole and even block a lubricating oil circulating system of the oil pump, so that the normal work of the engine is seriously influenced, and the service life of the engine is finally reduced.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model provides a novel silence chain, wear resistance is good, when increasing the oil storage space, promote production efficiency, reduce the manufacturing risk, effectively promote life.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a novel silence chain, comprises a plurality of work link joint, the round pin axle and the baffle of connecting the work link joint, the round pin axle inserts in the work link joint, and with baffle interference fit, there is side clearance between work link joint and the baffle. The requirements of installation matching and meshing transmission are met.
Preferably: the working chain plate consists of a pair of pin holes, a pair of teeth and a tooth top, the pin holes are of irregular circular structures formed by multiple sections of circular arcs, and the pin shafts are inserted into the circular pin holes.
Preferably: the pin hole is composed of an engaged working arc AB section, a transition arc BC section, a transition arc CD section, a transition arc EF section, a transition arc FA section and an assembly oil storage arc DE section which are of a certain length.
Preferably: the arc curvature centers O1 and O1' of the pin shaft are the pitch centers of the chain, and the curvature center O2 of the meshing working arc AB section and the curvature center O3 of the assembly oil storage arc DE section of the pin hole are on the same straight line with the pitch center of the chain.
Preferably: the radius of curvature R2 of the engagement working arc AB section of the pin hole is greater than or equal to the radius of curvature R1 of the arc of the pin inserted into the hole.
Preferably: the curvature radius R3 of the DE section of the oil storage arc for assembling the pin hole is larger than the curvature radius R2 of the AB section of the meshing working arc, so that R1, R2 and R3 meet the relation that R3 is larger than R2 and is larger than or equal to R1, and the pin shaft can be easily inserted into the pin hole.
A silent chain assembling method is characterized by comprising the following steps:
s1, assembling the working chain plate, the pin shaft for connecting the working chain plate and the guide plate into a chain;
s2, pre-tensioning is needed, the pre-tensioning force is 60% -90% of the broken load of the chain, and the pre-tensioning holding time is 0-120 seconds;
s3, after pre-tensioning, the arc at one side of the pin shaft is tightly attached to the side of the AB section of the engagement working arc of the working chain plate, and a gap is formed between the assembly oil storage arc DE and the arc at the other side of the pin shaft.
Preferably: the size of a gap between the assembling oil storage arc DE and the arc on the other side of the pin shaft is 1% -5% of the chain pitch, lubricating oil is filled in the gap, a precondition is laid for formation of a dynamic pressure oil film, the pin shaft is always wrapped in the oil film and is in contact with pin holes of the working chain plates, the oil storage space is enlarged, lubrication of the chain system is promoted, noise is reduced when the silent chain moves at a high speed due to the dynamic pressure oil film, and the service lives of the silent chain system and an engine are prolonged.
The utility model discloses it does to have beneficial effect:
the working chain plate can increase the contact area of the hinge by reducing the fit clearance between the working chain plate and the pin shaft on the premise of not reducing the strength of the chain plate, and effectively reduces the contact stress of the hinge, thereby obtaining the best wear resistance. Design assembly oil storage circular arc DE section, when increasing the oil storage space, promote the production efficiency of silence chain, in the pinhole of the work chain board of inserting that the round pin axle can be relaxed promptly, fundamentally has reduced manufacturing process and has taken place risk such as cutting the eye and tight festival, the utility model discloses can effectively promote chain drive system's life.
Drawings
Fig. 1 is a view of a conventional silent chain with its link plate and pin engaged, as described in the background of the invention.
Fig. 2 is a front view of a working link plate according to the present invention;
FIG. 3 is a schematic view of the present invention with the pin shaft loosely inserted into the link plate;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a view showing the engagement between the pre-stretched link plate and the pin shaft of the present invention;
FIG. 6 is an enlarged view of the pin bore of FIG. 5;
fig. 7 is a front view of the silent chain of the present invention;
fig. 8 is a top view of a silent chain in the present invention;
FIG. 9 is an enlarged fragmentary schematic view of the reservoir space of FIG. 8;
FIG. 10 shows the relationship between the pin hole fit clearance and the hinge contact stress in the present invention;
fig. 11 the utility model discloses in novel silence chain and the wear performance contrast test result of traditional silence chain.
Reference numerals: 1. a silent chain; 2. a working chain plate; 3. a pin shaft; 4. a guide plate; 21. a pin hole; 22. teeth; 23. tooth top; 22a, an inner side surface; 22b, an outer side surface; 31. an oil storage space.
Detailed Description
The preferred embodiments of the present invention will be further described in detail with reference to the accompanying drawings.
The novel silent chain as shown in fig. 2-11 comprises a plurality of working chain plates 2, pin shafts 3 connecting the working chain plates 2, and guide plates 4, wherein the pin shafts 3 are inserted into the working chain plates 2 and are in interference fit with the guide plates 4, and lateral gaps are formed between the working chain plates 2 and the guide plates 4. The requirements of installation matching and meshing transmission are met. The link plate 2 is composed of a pair of pin holes 21, a pair of teeth 22 formed by an inside flank surface 22a and an outside flank surface 22b hanging downward from the pin holes 21 in a triangular shape, and a tooth crest 23, the pin holes 21 are formed by a plurality of circular arcs into an irregular circular structure, and the pin shafts 3 are inserted into the circular pin holes 21. The pin hole 21 is composed of an engagement working arc AB section, a transition arc BC section, a transition arc CD section, a transition arc EF section, a transition arc FA section and an assembly oil storage arc DE section with certain length.
The arc curvature centers O1 and O1' of the pin shaft 3 are the pitch centers of the chain, and the curvature center O2 of the meshing working arc AB section and the curvature center O3 of the assembly oil storage arc DE section of the pin hole 21 are on the same straight line with the pitch centers of the chain. The radius of curvature R2 of the engagement working arc AB section of the pin hole 21 is similar to or equal to the radius of curvature R1 of the arc of the pin shaft 3 inserted into the hole. The curvature radius R3 of the assembly oil storage arc DE section of the pin hole 21 is larger than the curvature radius R2 of the engagement working arc AB section, so that R1, R2 and R3 meet the relation that R3 is larger than R2 and is larger than or equal to R1, R2 is R1+ N, N is 0-0.04, and the pin shaft 3 can be easily inserted into the pin hole 21. The design can increase the contact area of the hinge and reduce the contact stress, when the tight edge tension of the chain is kept at 2000N, when the fit clearance between R1 and R2 is changed, the contact stress of the hinge is changed to a certain extent, when R2 is closer to R1, the clearance fit between the R1 and the R2 is smaller, the contact area of the hinge is increased, and the contact stress is reduced, so that the wear elongation of the silent chain is reduced fundamentally, the wear resistance of the silent chain is improved greatly, and the service life of an engine is prolonged.
According to the invention, the working chain plate 2 can reduce the fit clearance between the working chain plate 2 and the pin shaft 3 on the premise of not reducing the strength of the chain plate, so that the contact area of the hinge is increased, the contact stress of the hinge is effectively reduced, and the optimal wear resistance is obtained. The DE section of the oil storage arc is designed and assembled, the production efficiency of the silent chain is improved while the oil storage space is increased, namely, the pin shaft 3 can be easily inserted into the pin hole 21 of the working chain plate 2, the risks of hole cutting, joint tightening and the like in the manufacturing process are fundamentally reduced, and the service life of the chain transmission system can be effectively prolonged.
A novel silent chain assembling method comprises the following steps:
s1, assembling the working chain plate, the pin shaft for connecting the working chain plate and the guide plate into a chain;
s2, pre-tensioning is needed, the pre-tensioning force is 60% of the breaking load of the chain, and the pre-tensioning holding time is 70 seconds;
s3, after pre-tensioning, one side arc of the pin shaft is tightly attached to one side of an AB section of an engaged working arc of the working chain plate, a gap is formed between an assembly oil storage arc DE and the other side arc of the pin shaft, the gap between the assembly oil storage arc DE and the other side arc of the pin shaft is 1% -5% of the chain pitch, the gap is represented by delta 2, an oil storage space where the gap is located can be used for storing enough lubricating oil, a precondition is laid for the formation of a dynamic pressure oil film, the timing chain system of the automobile engine belongs to typical high-speed transmission and needs continuous pressure oil injection lubrication, the lubricating oil flows from one side of a larger oil storage space to a smaller gap, the pin shaft slides relatively in a pin hole of the working chain plate, the pin shaft is always wrapped in the oil film to be in contact with the pin hole of the working chain plate, and the oil storage space is increased to be beneficial to improving the lubrication, the presence of the hydrodynamic oil film ensures that the silent chain reduces noise during high speed motion and extends the life of the silent chain system and the engine.
The delta 2 value and the P value in the invention need to satisfy the following relational expression: Δ 2 ═ (1% to 5%) of P, e.g., P ═ 8mm, R1 ═ 1.66mm, R2 ═ 1.68 mm; r3 is 1.85mm, the residual gap delta 2 is 0.32mm after the chain plate is tightly fit with the pin shaft, and the area of the corresponding oil storage space is 1.6mm2. Referring to fig. 1 of the prior art, the gap delta 1 left after the working chain plate is matched with the pin shaft is 0.06mm, and the corresponding oil storage space area is 0.21 mm2. Obviously, the area of the oil storage space is multiplied by the thickness of the chain plate to form the oil storage space, and the oil storage amount in the silent chain is more than 7 times larger than that of the traditional silent chain.
As can be seen from fig. 7, 8 and 9, the position and the flowing direction of the lubricating oil in the silent chain have the condition of forming a dynamic pressure oil film, the lubricating oil can flow into the pin hole from the side clearance between the guide plate and the operating link plate, the side clearance is represented by Δ H, the oil is stored in the clearance between the pin shaft and the pin hole, the Δ H value can be designed to be 0.4-0.8 mm according to the requirement of the manufacturing process, the Δ H value in the embodiment is 0.5, the transverse width of the end of K1 is 0.32mm, and the transverse width of the minimum end of K2 is 0.04 mm. The pin shaft of the silent chain is driven by a load to slide relative to the working chain plate, lubricating oil is extruded, continuously flows into the large-section K1 end of the wedge-shaped hole and flows out of the small-section K2 end of the wedge-shaped hole, the forming condition of a dynamic pressure oil film is met, heat dissipation during hinge friction is facilitated, the lubricating effect is improved, friction loss is reduced, and the service life of the whole chain transmission system is finally prolonged.
Example II,
The working chain plates shown in the figure 3 are alternately inserted into pin shafts to be assembled to form the novel silent chain shown in the figure 7 and the figure 8, the number of the sections is 88, 70% of the breaking strength of the chain is used as pretensioning force, after the pretensioning is kept for 100 seconds, the chain is installed on 19-tooth and 38-tooth matched chain wheels and operates at the rotating speed of 6500 r/min, continuous pressure oil injection lubrication is provided in the process, the tension of the tight edge of the chain is always subjected to a load of 1000N during the test, and the abrasion elongation (%) index of the chain is measured at regular time after the chain is continuously operated for a certain time. The silent chain in the same background technology is assembled by adopting the chain plates and the pin shafts shown in figure 1, the silent chain is assembled into the same number of sections by adopting the same method, and the comparison test is carried out on the same test bed.
As a comparative test of fig. 11, a1, a2, and a3 are silent chains in the embodiment of the present invention, respectively, and b1 and b2 are conventional silent chains as a comparison. The a1, a2 and a3 are three kinds of clearance fit chains designed by the embodiment of the invention, and are abbreviated as a1 chains: r2 ═ R1+0.03, chain a 2: r2 ═ R1+ 0.02. Chain a 3: r2 ═ R1+ 0.01. The R1 is the arc curvature radius of the pin shaft; r2 is the curvature radius of AB section of the meshing working arc; r3 is the radius of curvature of the segment DE of the oil storage circular arc for assembling the embodiment of the invention.
Where b1 and b2 are two different clearance fit conventional silent chains of comparative implementation, b1 chain: r2'═ R1' +0.03, chain b 2: r2 ═ R1' + 0.02. R1' is the arc curvature radius of the pin shaft; r2' is the radius of curvature of the arc of the pin aperture of the link plate. The test result shows that compared with the traditional silent chain, the silent chain has smaller abrasion elongation rate under the condition of the same fit clearance and after the silent chain continuously runs at high rotating speed for a certain time. Likewise, with a reduced fit clearance, a lower wear elongation indicates a more wear resistant chain. The comparison test result shows that the wear resistance of the silent chain can be obviously improved.
Example III,
Example three was about the same as example one except that the pretension force was 90% of the chain breaking load and the pretension hold time was 120 seconds.
The above-mentioned embodiments are only used for explaining the inventive concept of the present invention, and do not limit the protection of the claims of the present invention, and any insubstantial modifications of the present invention using this concept shall fall within the protection scope of the present invention.
Claims (4)
1. The utility model provides a novel silence chain comprises the round pin axle and the baffle of work link joint, connection work link joint, its characterized in that: the pin shaft is inserted into the working chain plate and is in interference fit with the guide plate, a lateral gap is formed between the working chain plate and the guide plate, the working chain plate comprises a pair of pin holes, a pair of teeth and a tooth crest, the pin holes are formed by multiple sections of circular arcs, the pin shaft is inserted into the circular pin holes, and the pin holes are formed by a meshing working circular arc AB section, a transition circular arc BC section, a transition circular arc CD section, a transition circular arc EF section, a transition circular arc FA section and an assembly oil storage circular arc DE section which are of certain lengths.
2. A novel silent chain as claimed in claim 1, wherein: the arc curvature centers O1 and O1' of the pin shaft are the pitch centers of the chain, and the curvature center O2 of the meshing working arc AB section and the curvature center O3 of the assembly oil storage arc DE section of the pin hole are on the same straight line with the pitch center of the chain.
3. A new silent chain, according to claim 1 or 2, characterized in that: the radius of curvature R2 of the engagement working arc AB section of the pin hole is greater than or equal to the radius of curvature R1 of the arc of the pin inserted into the hole.
4. A novel silent chain as claimed in claim 3, wherein: the curvature radius R3 of the DE section of the oil storage arc for assembling the pin hole is larger than the curvature radius R2 of the AB section of the engaged working arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020798880.2U CN212717817U (en) | 2020-05-14 | 2020-05-14 | Novel silent chain |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020798880.2U CN212717817U (en) | 2020-05-14 | 2020-05-14 | Novel silent chain |
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| CN212717817U true CN212717817U (en) | 2021-03-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594575A (en) * | 2020-05-14 | 2020-08-28 | 杭州东华链条集团有限公司 | Novel silent chain and assembling method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594575A (en) * | 2020-05-14 | 2020-08-28 | 杭州东华链条集团有限公司 | Novel silent chain and assembling method thereof |
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