CN114703453A

CN114703453A - Motorcycle racing sprocket and manufacturing method thereof

Info

Publication number: CN114703453A
Application number: CN202210345244.8A
Authority: CN
Inventors: 王帅; 颜霞
Original assignee: Chongqing Juelang New Energy Technology Co ltd
Current assignee: Chongqing Jue Lang Motorcycle Spare Parts Co ltd
Priority date: 2022-04-02
Filing date: 2022-04-02
Publication date: 2022-07-05
Anticipated expiration: 2042-04-02
Also published as: CN114703453B; WO2023185611A1

Abstract

The invention provides a motorcycle racing chain wheel and a manufacturing method thereof, wherein the motorcycle racing chain wheel comprises a chain wheel disc body, wherein a shaft hole and gear teeth are arranged on the chain wheel disc body, and a plurality of first lightening holes and a plurality of second lightening holes are formed in the chain wheel disc body; all surfaces of the chain wheel disc body are deposited with antifriction coatings through a physical vapor deposition method, the antifriction coatings sequentially comprise a Cr layer, an AlCrN layer and an Al-DLC layer from inside to outside, wherein the thickness of the Cr layer is 0.4-0.5 mu m, the thickness of the AlCrN layer is 0.6-0.7 mu m, and the thickness of the Al-DLC layer is 1.1-1.4 mu m; the carbon fiber paster is attached to two disc surfaces of the chain wheel disc body, the two disc surfaces of the chain wheel disc body sink to form a sinking platform for mounting the carbon fiber paster, and the carbon fiber paster is fixedly embedded on the sinking platform. The invention provides a motorcycle racing sprocket with excellent comprehensive performance, which has low friction coefficient and good wear resistance.

Description

Motorcycle racing sprocket and manufacturing method thereof

Technical Field

The invention relates to the technical field of transmission system parts, in particular to a motorcycle racing chain wheel and a manufacturing method thereof.

Background

There are many mechanical devices for chain transmission, and one of them is a motorcycle, on which a driving sprocket and a driven sprocket are required to realize a good transmission effect.

The chain wheel of the motorcycle racing car is required to be light in weight, high in strength, strong in wear resistance, high-temperature resistant and low in friction coefficient, so that the high-performance requirement of the motorcycle racing car is met. At present, most of conventional chain wheels are made of aluminum alloy or steel, the aluminum chain wheels are low in strength and relatively weak in wear resistance, and the steel chain wheels are heavy in weight. At present, the conventional chain wheel cannot meet the higher performance requirements of motorcycle racing, and friction and abrasion are two important factors causing chain wheel failure.

Therefore, how to design a motorcycle racing sprocket with excellent performance to make it light in weight, high in strength, strong in wear resistance, high temperature resistant and low in friction coefficient becomes a technical problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention provides a motorcycle racing sprocket and a manufacturing method thereof, so as to produce a motorcycle racing sprocket with light weight, high strength, strong wear resistance, high temperature resistance and low friction coefficient.

In order to achieve the purpose, the invention provides a motorcycle racing sprocket which comprises a sprocket disc body, wherein a shaft hole and gear teeth are arranged on the sprocket disc body;

a plurality of first lightening holes and a plurality of second lightening holes are formed in the chain wheel disc body;

all surfaces of the chain wheel disc body are deposited with antifriction coatings through a physical vapor deposition method, the antifriction coatings sequentially comprise a Cr layer, an AlCrN layer and an Al-DLC layer from inside to outside, wherein the thickness of the Cr layer is 0.4-0.5 mu m, the thickness of the AlCrN layer is 0.6-0.7 mu m, and the thickness of the Al-DLC layer is 1.1-1.4 mu m;

the carbon fiber paster is attached to two disc surfaces of the chain wheel disc body, the two disc surfaces of the chain wheel disc body sink to form a sinking platform for mounting the carbon fiber paster, and the carbon fiber paster is fixedly embedded on the sinking platform.

Preferably, the first lightening holes are triangular holes, and a plurality of the first lightening holes are located on the same circumference and are uniformly distributed along the circumferential direction;

the second lightening holes are circular holes, a plurality of second lightening holes are located on the same circumference and are evenly distributed along the axial direction, and the second lightening holes are located on the periphery of the first lightening holes.

Preferably, the hole edge of the second lightening hole is provided with an outward convex flange.

Preferably, the carbon fiber patch is provided with a positioning hole matched with the flange of the second lightening hole, and the carbon fiber patch is sleeved on the flange of the second lightening hole through the positioning hole.

Compared with the introduction content of the background technology, the invention provides the motorcycle racing chain wheel, the weight of the chain wheel is reduced by arranging the lightening holes on the body of the chain wheel, and the weight of the chain wheel is reduced. Simultaneously, paste the carbon fiber paster through the heavy platform on two quotations of sprocket disk body, the carbon fiber paster has the advantage that the quality is light, intensity is high, under the prerequisite of realizing the lightweight, satisfies sprocket intensity demand.

In addition, the performance of the chain wheel is enhanced by the three layers of functional coatings deposited on the surface of the chain wheel disc body. The innermost coating is a Cr layer, and the Cr layer is used for priming, so that the wear-resistant chain wheel has high hardness and good chemical stability, and the wear resistance of the chain wheel is improved; the middle coating is an AlCrN layer, the AlCrN layer is introduced as a transition layer, the overall binding force of the coating is improved, and meanwhile, the AlCrN layer has better oxidation resistance, so that the chain wheel is more resistant to high-temperature oxidation, and the service life of the chain wheel is prolonged; the outermost coating is an Al-DLC coating which forms a self-lubricating friction amplitude on the surface of the sprocket disc body, so that the outer surface of the sprocket disc body has an extremely low friction coefficient, and the power loss of the sprocket is reduced.

The invention also provides a method of manufacturing a motorcycle racing sprocket as described in any one of the above, comprising the steps of:

s1, processing the outline of the sprocket disc body by a numerical control machine;

s2, firstly, removing an oxide layer or other stains on the surface of the sprocket disc body by a shot blasting method; then polishing the surface of the sprocket wheel body to increase the smoothness of the surface of the sprocket wheel body; then carrying out acid cleaning and rust removal on the chain wheel disc body; then the chain wheel disc body is wiped clean;

s3, loading the cleaned sprocket wheel body on a rotary tool frame at the center of a film coating vacuum chamber, keeping the sprocket wheel body in an upright state and keeping the sprocket wheel body rotatable for 360 degrees;

s3, vacuumizing the film coating vacuum chamber to 2-4 multiplied by 10 < -4 > Pa, and keeping the chain wheel disc body rotating at the speed of 3 r/min; opening a high-voltage pulse power supply, introducing argon and hydrogen, and enabling the flow ratio of the argon to the hydrogen to be 2: 1; keeping the air pressure at 2-3 Pa, adjusting the bias voltage at 1000-2000V, the frequency at 450Hz, the duty ratio at 10%, and cleaning for 20-30 min;

s4, sequentially depositing a Cr layer, an AlCrN layer and an Al-DLC layer on the outer surface of the sprocket disc body from inside to outside through a physical vapor deposition method.

Preferably, the method for depositing the Cr layer in step S4 is:

the vacuum chamber has the air pressure of 1.2-1.6 Pa, the flow ratio of argon to hydrogen is 3:1, a direct-current pulse power supply is started, the bias voltage is adjusted to 700-800V, a Cr target is started, the arc current is 11-13A, the pulse frequency is 30-39 Hz, the duty ratio is 45%, deposition is carried out for 25-30 min, and a Cr layer is deposited on the surface of the gear substrate.

Preferably, the method for depositing the AlCrN layer in step S4 includes:

the air pressure of the vacuum chamber is 1.2-1.6 Pa, and the flow ratio of argon to hydrogen is 3: 1; and (3) turning on a direct current pulse power supply, adjusting the bias voltage to 700-800V, turning on an AlCrN target, setting the arc current to be 20-30A, the pulse frequency to be 30-39 Hz, the duty ratio to be 45%, and depositing for 30-40 min.

Preferably, the method for depositing the Al-DLC layer in step S4 is:

the air pressure of the vacuum chamber is 1.2-1.6 Pa, and the flow ratio of argon to hydrogen is 3: 1; and (3) turning on a direct current pulse power supply, adjusting the bias voltage to 1000-1500V, turning on an AlCrN target, setting the arc current to be 20-30A, the pulse frequency to be 30-39 Hz, the duty ratio to be 50%, and depositing for 70-100 min.

The invention provides a method for manufacturing the motorcycle racing sprocket wheel, which is characterized in that a Cr layer, an AlCrN layer and an Al-DLC layer are sequentially deposited on the surface of the sprocket wheel by a physical vapor deposition method to realize the performance enhancement of the sprocket wheel. During deposition, the chain wheel disc body is kept in a vertical state and can rotate for 360 degrees, so that coatings at all positions of the chain wheel disc body are uniform, and the generation of a male surface and a female surface is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a perspective view of a motorcycle racing sprocket according to an embodiment of the present invention;

FIG. 2 is an exploded view of the motorcycle racing sprocket of FIG. 1;

FIG. 3 is a schematic structural diagram of a sprocket disc according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a sprocket for a sprocket motorcycle race according to an embodiment of the present invention;

reference numerals

1-sprocket wheel body; 1 a-an axial hole; 1 b-gear teeth; 2-first lightening holes; 3-a second lightening hole; 3 a-a flange; 4-carbon fiber patch; 4 a-locating hole.

Detailed Description

The core of the invention is to provide a motorcycle racing chain wheel and a manufacturing method thereof, so as to solve the technical problem of poor performance of the motorcycle racing chain wheel.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, fig. 1 is a perspective view of a motorcycle racing sprocket according to an embodiment of the present invention;

FIG. 2 is an exploded view of the motorcycle racing sprocket of FIG. 1; FIG. 3 is a schematic structural diagram of a sprocket disc according to an embodiment of the present invention; FIG. 4 is a schematic plane view of a sprocket according to an embodiment of the present invention.

The invention discloses a motorcycle racing sprocket, which comprises a sprocket disc body 1, wherein a shaft hole 1a and a gear tooth 1b are arranged on the sprocket disc body 1. In order to reduce the weight of the chain wheel, a plurality of first lightening holes 2 and a plurality of second lightening holes 3 are formed in a chain wheel disc body 1. The first lightening holes 2 are triangular holes, and the plurality of first lightening holes 2 are located on the same circumference and are uniformly distributed along the circumferential direction. The second lightening holes are circular holes, the plurality of second lightening holes 3 are located on the same circumference and are evenly distributed along the circumferential direction, and the second lightening holes 3 are located on the periphery of the first lightening holes 2.

The weight of the chain wheel is reduced by arranging the lightening holes, so that the weight is reduced. It should be noted that the shape of the first lightening hole 2 and the second lightening hole 3 may be set by those skilled in the art according to the actual vehicle model and the sprocket parameters, and is not limited thereto in more detail. For convenience of understanding, in the present embodiment, the first lightening hole 2 is a triangular hole, and the second lightening hole 3-bit circular hole is taken as an example for explanation.

Carbon fiber patches 4 are attached to two disc surfaces of the sprocket disc body 1. Specifically, two quotations of sprocket disk body 1 all sink and form the heavy platform 1c (see fig. 3) that is used for installing the carbon fiber paster, and carbon fiber paster 4 is fixed to inlay to be adorned on heavy platform 1 c. As shown in FIG. 3, the disk surface between the shaft hole 1a and the gear teeth 1b of the sprocket disk body sinks to form a sinking platform 1c, and the carbon fiber patch 4 is fixedly embedded on the bearing platform 1 c. The carbon fiber patch 4 has the advantages of light weight and high strength, the weight of the chain wheel is further reduced by the way of pasting the carbon fiber patch 4, and the strength requirement of the chain wheel is met on the premise of realizing light weight. The sprocket of more lightweight can bring better effect of accelerating under the condition of same tooth ratio to promote the acceleration performance of motorcycle racing car.

As shown in figure 4, before the carbon fiber patches 4 are attached, all the surfaces of the sprocket disc body 1 are deposited with antifriction coatings by a physical vapor deposition method, wherein the antifriction coatings comprise a Cr layer, an AlCrN layer and an Al-DLC layer from inside to outside in sequence, the thickness of the Cr layer is 0.4-0.5 μm, the thickness of the AlCrN layer is 0.6-0.7 μm, and the thickness of the Al-DLC layer is 1.1-1.4 μm.

In the invention, the antifriction coating is deposited on the surface of the chain wheel disc body 1 to enhance various performances of the chain wheel. Specifically, the innermost coating is a Cr layer, and the Cr layer is used for priming, so that the wear-resistant chain wheel has high hardness and good chemical stability, and the wear resistance of the chain wheel is improved.

The middle coating is the AlCrN layer, and meanwhile, the AlCrN layer has better oxidation resistance, so that the chain wheel is more resistant to high-temperature oxidation, and the service life of the chain wheel is prolonged. The invention introduces the AlCrN layer as the transition layer, and the AlCrN layer has better bonding performance with the chain wheel aluminum substrate, and the physical properties of the AlCrN layer, such as thermal expansion coefficient, hardness and the like, are between the chain wheel substrate and the Al-DLC layer, thereby improving the overall bonding force of the coating. Before the AlCrN layer is deposited, a Cr layer is deposited, namely the transition layer structure of the Al-DLC layer and the chain wheel base body is a Cr/AlCrN coating, so that the bonding force between the Al-DLC layer and the chain wheel base body is further improved, the smooth transition between metal and nonmetal is realized, and the transition layer is favorable for improving the bonding force of the layer film.

The outermost coating is an Al-DLC coating which forms a self-lubricating friction amplitude on the surface of the sprocket disc body, so that the outer surface of the sprocket disc body has a very low friction coefficient, power loss caused by transmission is effectively reduced, and the horsepower on the wheel is closer to the horsepower of a machine head.

The existing DLC coating (diamond-like carbon coating) has excellent properties such as high elastic modulus, bottom friction coefficient, excellent wear resistance, etc., but it has problems such as high internal stress and poor film-substrate bonding force, which seriously affect the use range and life of the diamond-like carbon coating. Based on the Al-DLC coating, the outermost layer of the antifriction coating adopts the Al-DLC coating with the Al-doped diamond-like coating with high bonding strength, so that the problems of high internal stress, poor film-substrate bonding force and the like of the traditional DLC coating are solved.

In conclusion, the motorcycle racing chain wheel disclosed by the invention meets the strength requirement of the motorcycle racing chain wheel on the premise of realizing the lightweight of the chain wheel by arranging the lightening holes on the chain wheel body and sinking and embedding the carbon fiber patches on the disc surface. In addition, the three-layer functional coating is deposited on the surface of the chain wheel disc body, so that the wear resistance of the chain wheel is improved, the friction coefficient of the chain wheel is reduced, and the failure of parts caused by large friction and poor wear resistance of the chain wheel in the prior art is overcome.

The applicant carries out a plurality of loading tests on the motorcycle racing chain wheel disclosed by the invention, and the motorcycle racing chain wheel disclosed by the invention is loaded on a super racing car to run, the motorcycle racing chain wheel can ensure the optimal working condition to be more than 1-3 hours, the temperature can be endured to be more than 350 ℃, and the optimal working condition time is increased by more than one time compared with the traditional all-aluminum all-steel ordinary chain wheel.

In a further technical solution, as shown in fig. 2 and 3, the hole edge of the second lightening hole 3 is provided with an outwardly protruding flange 3a, and the carbon fiber patch 4 is provided with a positioning hole 4a matched with the flange 3a of the second lightening hole. When pasting carbon fiber paster 4, carbon fiber paster 4 overlaps through its locating hole 4a and establishes on the flange 3a of second lightening hole 3, realizes the location to carbon fiber paster 4, makes things convenient for carbon fiber paster 4's installation more. In addition, the flanges 3a of the second lightening holes 3 protrude out of the sunken platforms 1c, and the strength of the chain wheel disc body 1 is enhanced.

The method for depositing the Cr layer in step S4 specifically includes:

The method for depositing the AlCrN layer in step S4 specifically includes:

The method for depositing the Al-DLC layer in the step S4 specifically comprises the following steps:

According to the invention, the Cr layer, the AlCrN layer and the Al-DLC layer are sequentially deposited on the surface of the sprocket disc body 1 by a physical vapor deposition method, so that the performance of the sprocket is enhanced. During deposition, the chain wheel disc body 1 is kept in a vertical state and can rotate for 360 degrees, so that coatings at all positions of the chain wheel disc body are uniform, and the generation of a male surface and a female surface is avoided.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements. An element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A motorcycle racing chain wheel comprises a chain wheel disc body, wherein a shaft hole and wheel teeth are arranged on the chain wheel disc body; it is characterized in that the preparation method is characterized in that,

2. The motorcycle racing sprocket as claimed in claim 1, wherein the first lightening holes are triangular holes, and a plurality of the first lightening holes are located on the same circumference and are uniformly distributed along the circumferential direction;

3. A motorcycle racing sprocket as claimed in claim 2, wherein the edge of the second lightening hole has an outwardly projecting flange.

4. The motorcycle racing sprocket of claim 3, wherein the carbon fiber patches have positioning holes for fitting with the flanges of the second lightening holes, and the carbon fiber patches are fitted on the flanges of the second lightening holes through the positioning holes.

5. A method of manufacturing a motorcycle racing sprocket as claimed in any one of claims 1 to 4, comprising the steps of:

6. The method of manufacturing a motorcycle racing sprocket as claimed in claim 5, wherein the Cr layer is deposited in step S4 by:

the air pressure of a vacuum chamber is 1.2-1.6 Pa, the flow ratio of argon to hydrogen is 3:1, a direct-current pulse power supply is turned on, the bias voltage is adjusted to 700-800V, a Cr target is turned on, the arc current is 11-13A, the pulse frequency is 30-39 Hz, the duty ratio is 45%, the deposition is carried out for 25-30 min, and a Cr layer is deposited on the surface of the gear substrate.

7. The method of manufacturing a motorcycle racing sprocket as claimed in claim 5, wherein the AlCrN layer is deposited in step S4 by:

8. The method of manufacturing motorcycle racing sprocket as claimed in claim 5, wherein the method of depositing the Al-DLC layer in step S4 is: