Sprocket guard and sprocket suitable for the sprocket guard

Abstract

A sprocket guard and a sprocket suitable for the sprocket guard, wherein the sprocket guard comprises a side plate and a tooth sleeve, the side plate has the same cross-sectional shape as the sprocket, the periphery of the side plate is provided with tooth protrusions corresponding to the sprocket teeth, and a through hole is formed in the center of the side plate; the tooth sleeve has tooth covering portions protruding outward corresponding to the tooth protrusions, the periphery contour of the side plate corresponds to the two side opening contours of the tooth sleeve, the tooth sleeve is combined with the periphery of the side plate through one side opening to form a containing space with one side opening, and the sprocket is fixedly arranged in the containing space through the side opening so that the sprocket teeth are fixedly covered by the tooth covering portions and the shaft hole of the sprocket is aligned with the through hole. In this way, the sprocket guard is used to protect the sprocket and the transmission components cooperating with the chain, which can reduce the damage of the sprocket during transmission, and the maintenance cost of the equipment can be reduced by replacing the worn sprocket guard.

Description

Technical Field

[0001] This utility model relates to the technical field of sprockets, and in particular to a sprocket protective cover and a sprocket suitable for the sprocket protective cover. Background Technology

[0002] A sprocket is a component that works in conjunction with a chain to transmit power. Transmission systems consisting of sprockets and chains are widely used in manufacturing, transportation, and many other fields. Since the main transmission component of a sprocket is the chain teeth, power is transmitted through the meshing of the teeth with chain links. However, long-term, high-frequency contact, stress, and friction between the teeth and chain leads to wear on the surface of the teeth, and the degree of wear intensifies with increased usage time. Traditional sprockets typically employ a one-piece structure, meaning the chain teeth and the sprocket body are integrally molded. This means that when the chain teeth are damaged and cannot reliably mesh with the chain links, the entire sprocket must be replaced. This results in high operating and maintenance costs and significant resource waste. Therefore, reducing the use and maintenance costs of sprockets and improving resource utilization has become one of the urgent technical problems to be solved in this field. Utility Model Content

[0003] The technical problem this solution aims to solve is how to reduce the cost of using and maintaining sprockets and improve resource utilization.

[0004] To solve the above-mentioned technical problems, this technical solution provides a sprocket protective cover, which includes: a side plate and a toothed sleeve. The side plate has the same shape as the cross-sectional shape of the sprocket, and the periphery of the side plate has several tooth protrusions corresponding to several teeth of the sprocket in the circumferential direction. A circular through-hole is provided in the center of the side plate. The toothed sleeve is cylindrical and has several tooth-encasing portions protruding outward on the circumferential sidewall corresponding to the tooth protrusions. The periphery contour of the side plate corresponds to the contours of the two side edges of the toothed sleeve. The toothed sleeve is fixedly attached to the periphery of the side plate through one side edge so that the toothed sleeve and the side plate enclose a receiving space with an opening on one side. The sprocket is fixedly installed in the receiving space through the side opening so that several teeth of the sprocket are fixedly covered by the several tooth-encasing portions and the shaft hole of the sprocket is aligned with the through-hole. Accordingly, by covering one and the circumferential sides of the sprocket with a sprocket guard, the sprocket teeth are protected by the toothed protrusions of the side plate and the toothed portion of the guard, making the toothed portion of the sprocket guard the part that contacts the chain links to withstand contact wear caused during transmission. The sprocket located inside the sprocket guard provides structural support for the overall sprocket structure. Since the sprocket does not contact the chain links during transmission, it does not wear and can effectively extend the sprocket's service life. In addition, the toothed portion of the sprocket guard undergoes slight deformation under transmission force, making it more tightly wrapped with the chain teeth, thereby improving the stability of the connection between the sprocket and the sprocket guard. When the sprocket guard wears out due to long-term operation, it can be simply removed from the sprocket and replaced with a new sprocket guard to reuse the sprocket structure. Furthermore, since the cost of the sprocket guard is much lower than that of the sprocket, it reduces the operating and maintenance costs of the equipment and improves resource utilization due to the reusability of the sprocket.

[0005] As another implementation of this technical solution, at least one through hole is provided on the side plate. Accordingly, by using a tool such as a hammer to push against the sprocket through the through hole, the sprocket can be removed from the sprocket guard.

[0006] As another implementation of this technical solution, the diameter of the through-hole is larger than the diameter of the sprocket's shaft hole. Accordingly, the sprocket guard is suitable for sprocket structures mounted on the output shaft via a spline.

[0007] As another implementation of this technical solution, the side plate is provided with several threaded holes corresponding to the threaded holes of the sprocket. This makes the sprocket guard suitable for sprocket structures that are mounted on the hub by bolt fastening.

[0008] As another implementation of this technical solution, the diameter of the through-hole is greater than or equal to the diameter of the sprocket's shaft hole. This facilitates the insertion of the output shaft.

[0009] As another implementation of this technical solution, the distance between the two end edges of the toothed portion in the axial direction of the toothed sleeve gradually decreases along the direction away from the axis of the toothed sleeve, and the tooth protrusion gradually tilts towards the accommodating space along the direction away from the center of the side plate. Accordingly, the structure of the toothed portion with its thickness gradually decreasing from the inside to the outside along the radial direction of the sprocket guard is better suited for covering the chain teeth of some sprockets with an outwardly tapering structure, that is, the thickness change of the toothed portion is consistent with the thickness change of the sprocket teeth. This tooth tapering structure is more conducive to the engagement space of the chain teeth entering and exiting the chain links.

[0010] As another implementation of this technical solution, the side plate and tooth guard are made of metal sheet by stamping and integral molding. This makes the sprocket guard easier to manufacture and reduces manufacturing costs.

[0011] As another implementation of this technical solution, the metal plate is made of carbon steel or alloy steel. This ensures that the sprocket guard has high structural strength.

[0012] To address the aforementioned technical problems, this technical solution provides a sprocket suitable for sprocket guards where the side plate lacks threaded holes and the diameter of the through-hole is larger than the diameter of the sprocket's shaft hole. The sprocket's shaft hole has at least one spline on its edge. When the sprocket is fixedly installed within the accommodating space, the edge of the through-hole is located outside the upper edge of the spline. The sprocket and sprocket guard are fixedly mounted on the output shaft by fitting the output shaft through the shaft hole and engaging the spline with the key teeth of the output shaft. The sum of the thickness of the sprocket teeth and the thickness of the toothed protrusions of the side plate is equal to the thickness of the teeth of a standard sprocket. The sum of the width of the sprocket teeth and the thickness of the two sidewalls of the toothed portion is equal to the width of the teeth of a standard sprocket. The sum of the diameter of the sprocket and the thickness of the two sidewalls of the toothed portion is equal to the diameter of a standard sprocket. Therefore, the sprocket structure consisting of this sprocket and a suitable sprocket guard can be mounted and fixed on the output shaft for use.

[0013] To address the aforementioned technical problems, this technical solution also provides a sprocket. This sprocket is suitable for sprocket guards with threaded holes on the side plate, the diameter of which is greater than or equal to the diameter of the sprocket's shaft hole. The sprocket has several threaded holes. When the sprocket is fixedly installed within the accommodating space, several bolts are aligned and pass through the threaded holes and the threaded holes on the side plate to screw the sprocket and sprocket guard onto the hub. The sum of the thickness of the sprocket teeth and the thickness of the toothed protrusions on the side plate is equal to the thickness of the teeth of a standard sprocket. The sum of the width of the sprocket teeth and the thickness of the two side walls of the toothed portion is equal to the width of the teeth of a standard sprocket. The sum of the diameter of the sprocket and the thickness of the two side walls of the toothed portion is equal to the diameter of a standard sprocket. Therefore, the sprocket structure consisting of this sprocket and a suitable sprocket guard can be installed and fixed onto the hub for use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first embodiment of the sprocket protective cover of this utility model;

[0015] Figure 2 A side cross-sectional view of the first embodiment of the sprocket guard, showing the placement of the adapter sprocket.

[0016] Figure 3 A front view of the sprocket placed within the first embodiment of the sprocket guard;

[0017] Figure 4 This is a schematic diagram of the second embodiment of the sprocket guard of this utility model;

[0018] Figure 5 A side cross-sectional view of the second embodiment of the sprocket guard, showing the placement of the adapter sprocket towards the sprocket guard.

[0019] Figure 6 A front view of the sprocket placed within the second embodiment of the sprocket guard;

[0020] Figure 7 This is a partially enlarged schematic diagram of the toothed portion of the sprocket guard.

[0021] Explanation of symbols in the attached diagram:

[0022] A. Sprocket guard; A'. Sprocket guard; a1. Side plate; a11. Tooth protrusion; a12. Through opening; a12'. Through opening; a13. Through hole; a14'. Threaded hole; a2. Tooth sleeve; a21. Tooth covering part; a3. Accommodation space; L. Distance; B. Sprocket; B'. Sprocket; b1. Sprocket tooth; b2. Shaft hole; b21. Spline; b2'. Shaft hole; b3'. Threaded hole. Detailed Implementation

[0023] The detailed description and technical content of this utility model are explained below with reference to the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit this utility model.

[0024] In the context of this specification, any two or more embodiments of this utility model can be arbitrarily combined, and the resulting technical solutions are part of the original disclosure of this specification and also fall within the protection scope of this utility model.

[0025] like Figure 1The diagram shown is a schematic representation of the first embodiment of the sprocket protective cover of this utility model. The sprocket protective cover A of this first embodiment includes a side plate a1 and a toothed sleeve a2. The side plate a1 has the same surface shape as the cross-sectional shape of the sprocket, and several tooth protrusions a11 are formed on the periphery of the side plate a1 corresponding to several circumferential teeth of the sprocket. A circular through-hole a12 is provided in the center of the side plate a1. The toothed sleeve a2 is cylindrical, and several toothed portions a21 are formed on the circumferential sidewall of the toothed sleeve a2 corresponding to the tooth protrusions a11. The periphery contour of the side plate a1 corresponds to the contours of the two side edges of the toothed sleeve a2. The toothed sleeve a2 is fixedly attached to the periphery of the side plate a1 through one side edge so that the toothed sleeve a2 and the side plate a1 enclose a receiving space a3 with an opening on one side. Figure 2 and Figure 3 As shown, sprocket B can be fixedly installed in the accommodating space a3 through the side opening, so that several sprocket teeth b1 of sprocket B are fixedly covered by several tooth-encasing parts a21, and the shaft hole b2 of sprocket B is aligned with the through opening a12. To facilitate the removal of the sprocket protective cover A, at least one through hole a13 can be provided on the side plate a1, such as... Figure 1 Only one through hole a13 is opened on the middle side plate a1. The through hole a13 is used to remove the sprocket B, which is fixedly installed in the sprocket guard A, from the accommodating space a3. The removal method is to use a tool such as a hammer (not shown in the figure) to pass through the through hole a13 from the other side of the accommodating space a3 and push against the sprocket B, so that the sprocket B can be pushed out from the sprocket guard A and removed.

[0026] Furthermore, in this first embodiment, the diameter of the through-hole a12 is larger than the diameter of the shaft hole b2 of the adapted sprocket B, thereby making the sprocket guard A suitable for a sprocket structure mounted on the output shaft (not shown) via spline b21. Additionally, to improve the stability of the combined structure of the sprocket guard A and the sprocket B, one or more internal threaded holes (not shown) can be aligned and opened on the side plate a1 and the adapted sprocket B, and fastened with bolts. This invention does not particularly limit the bolting structure; it can be provided, but it may also be omitted.

[0027] Combination Figure 4 , Figure 5 and Figure 6 The diagram shown is a schematic representation of the second embodiment of the sprocket protective cover of this utility model. The structure of the sprocket protective cover A' in this second embodiment is largely the same as that in the first embodiment, and the identical structures will not be described again. The difference lies in that: several screw holes a14' are provided on the side plate a1 corresponding to several screw holes b3' of the sprocket B'. Figure 4The diagram shows four threaded holes a14', and the corresponding sprocket B' also has four threaded holes b3'. However, this invention does not limit the number of threaded holes b3' and threaded holes a14'. Furthermore, the diameter of the through-hole a12' is greater than or equal to the diameter of the shaft hole b2' of the sprocket B' to facilitate the insertion of the output shaft. The sprocket guard A' of this second embodiment is suitable for sprocket structures mounted on a hub (not shown) by bolts (not shown).

[0028] Combination Figure 7 As shown, in the sprocket guards A and A' of the first and second embodiments described above, the distance L between the two end edges of the toothed portion a21 in the axial direction of the toothed sleeve a2 gradually decreases along the direction away from the axis of the toothed sleeve a2, and combined with Figure 2 and Figure 5 As shown, the toothed protrusion a11 gradually tilts towards the accommodating space a3 in a direction away from the center of the side plate a1. Thus, the structure of the toothed portion a21 with its thickness gradually decreasing from the inside to the outside along the radial direction of the sprocket guards A and A' is better suited for covering the outwardly tapering teeth b1 of some sprockets B and B'. That is, the thickness change of the toothed portion a21 is consistent with the thickness change of the teeth b1 of sprockets B and B'. This tooth tapering structure is more conducive to the engagement space of the teeth b1 entering and exiting the chain link.

[0029] Furthermore, in the sprocket guards A and A' of the first and second embodiments described above, the side plate a1 and the toothed sleeve a2 can be integrally formed by stamping metal plates, making the sprocket guards A and A' easier to manufacture and reducing manufacturing costs. Of course, the side plate a1 and the toothed sleeve a2 can also be combined by welding first and then grinding, or integrally formed by powder metallurgy injection molding. In addition, the side plate a1 can also be provided with various patterns of perforated holes to match the hollow structure (such as flower holes) on the sprocket and other mounting holes. This utility model does not limit the above manufacturing process and the hollow structure provided on the side plate a1. The metal plate material used to manufacture the sprocket guards A and A' can be carbon steel, such as low carbon steel, high carbon steel, etc., or alloy steel, such as manganese alloy steel or chromium alloy steel, etc., to ensure that the sprocket guards A and A' have high structural strength.

[0030] To adapt to the structure of the first embodiment of the sprocket guard A described above, this utility model also provides a sprocket B, combined with... Figure 2 and Figure 3 As shown, the sprocket B is suitable for a sprocket guard A on a side plate a1 where no bolt holes are provided and the diameter of the through opening a12 is larger than the diameter of the shaft hole b2 of the sprocket B, wherein the shaft hole b2 of the sprocket B has at least one spline b21 on its edge. Figure 3(As shown in the figure), when sprocket B is fixedly installed in the accommodating space a3, the edge of the through-hole a12 is located outside the upper edge of the spline b21. The output shaft is sleeved through the shaft hole b2 and the spline b21 is engaged with the key teeth (not shown) of the output shaft, thereby fixing the combined structure of sprocket B and sprocket guard A onto the output shaft. The sum of the thickness of the sprocket teeth b1 of sprocket B and the thickness of the tooth protrusions a11 of the side plate a1 is equal to the thickness of the sprocket teeth of a normal sprocket. The sum of the width of the sprocket teeth b1 of sprocket B and the thickness of the two side walls of the toothed portion a21 is equal to the width of the sprocket teeth of a normal sprocket. The sum of the diameter of sprocket B and the thickness of the two side walls of the toothed portion a21 is equal to the diameter of a normal sprocket. Accordingly, the sprocket structure composed of sprocket B and the sprocket guard A of the first embodiment can be installed and fixed on the output shaft for use, for example, as the front sprocket structure (small sprocket) of a motorcycle.

[0031] To adapt to the structure of the second embodiment of the sprocket guard A' described above, this utility model also provides another sprocket B', combined with... Figure 5 and Figure 6 As shown, the sprocket B' is suitable for a sprocket guard A' with a threaded hole a14' on the side plate a1 and a through opening a12' having a diameter greater than or equal to the diameter of the shaft hole b2' of the sprocket B'. The sprocket B' has several threaded holes b3'. When the sprocket B' is fixedly installed in the accommodating space a3, several bolts (not shown) are aligned and pass through the several threaded holes b3' and the several threaded holes a14' on the side plate a1 to secure the sprocket. The combined structure of wheel B' and sprocket guard A' is screwed and fixed to the wheel hub. The sum of the thickness of the chain tooth b1 of sprocket B' and the thickness of the tooth protrusion a11 of side plate a1 is equal to the thickness of the chain tooth of a normal sprocket. The sum of the width of the chain tooth b1 of sprocket B' and the thickness of the two side walls of the toothed portion a21 is equal to the width of the chain tooth of a normal sprocket. The sum of the diameter of sprocket B' and the thickness of the two side walls of the toothed portion a21 is equal to the diameter of a normal sprocket. Accordingly, the sprocket structure formed by sprocket B' and the sprocket guard A' of the adapted second embodiment can be installed and fixed to the wheel hub for use, for example, as the rear sprocket structure (large sprocket) of a motorcycle.

[0032] In summary, this utility model covers one and the circumferential sides of the sprocket with a sprocket guard, so that the sprocket teeth are protected by the toothed protrusions of the side plate and the toothed portion of the toothed sleeve. The toothed portion of the sprocket guard becomes the contact point with the chain links to withstand contact wear caused during transmission. The sprocket inside the sprocket guard provides structural support for the overall sprocket structure. Since the sprocket does not contact the chain links during transmission, it does not experience wear, effectively extending its service life. Furthermore, the chain... Under transmission force, the toothed part of the sprocket guard will undergo slight deformation to more tightly cover the sprocket teeth, thereby improving the stability of the connection between the sprocket and the sprocket guard. When the sprocket guard wears out due to long-term operation, the sprocket structure can be reused simply by removing the sprocket guard from the sprocket and replacing it with a new sprocket guard. Since the cost of the sprocket guard is much lower than that of the sprocket, it not only reduces the operating and maintenance costs of the equipment, but also improves the utilization rate of resources by reusing the sprocket.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the patent scope of the present utility model. Other equivalent changes made using the patent concept of the present utility model should all fall within the patent protection scope of the present utility model.

Claims

1. A sprocket protective cover, characterized in that, include: The side plate and the tooth protector sleeve are provided. The side plate has the same shape as the cross-sectional shape of the sprocket, and the periphery of the side plate has several tooth protrusions corresponding to several teeth of the sprocket. A circular through-hole is provided in the center of the side plate. The tooth protector sleeve is cylindrical and has several tooth-encasing portions protruding outward on its circumferential sidewalls corresponding to the tooth protrusions. The periphery of the side plate corresponds to the side edge contours of the tooth protector sleeve. The tooth protector sleeve is fixedly attached to the periphery of the side plate through one side edge so that the tooth protector sleeve and the side plate enclose a receiving space with one side opening. The sprocket is fixedly installed in the receiving space through the side opening so that several teeth of the sprocket are fixedly covered by the several tooth-encasing portions and the shaft hole of the sprocket is aligned with the through-hole.

2. The sprocket protective cover according to claim 1, characterized in that, At least one perforation is provided on the side plate.

3. The sprocket protective cover according to claim 2, characterized in that, The diameter of the through-hole is larger than the diameter of the sprocket's shaft hole.

4. The sprocket protective cover according to claim 2, characterized in that, The side plate is provided with several threaded holes corresponding to the threaded holes of the sprocket.

5. The sprocket protective cover according to claim 4, characterized in that, The diameter of the through-hole is greater than or equal to the diameter of the sprocket's shaft hole.

6. The sprocket protective cover according to claim 1, characterized in that, The distance between the two end edges of the toothed portion in the axial direction of the toothed sleeve gradually decreases along the direction away from the axis of the toothed sleeve, and the toothed protrusion gradually tilts towards the accommodating space along the direction away from the center of the side plate.

7. The sprocket protective cover according to claim 1, characterized in that, The side plate and tooth guard are made of metal sheet by stamping and forming.

8. The sprocket protective cover according to claim 7, characterized in that, The metal plate is made of carbon steel or alloy steel.

9. A sprocket suitable for the sprocket guard of claim 3, characterized in that, The sprocket has at least one spline on the edge of its shaft hole. When the sprocket is fixedly installed in the accommodating space, the edge of the through hole is located outside the upper edge of the spline. The sprocket and sprocket guard are fixedly installed on the output shaft by sleeve of the output shaft through the shaft hole and engaging the spline with the key teeth of the output shaft. The sum of the thickness of the sprocket teeth and the thickness of the tooth protrusion of the side plate is equal to the thickness of the teeth of a normal sprocket. The sum of the width of the sprocket teeth and the thickness of the two side walls of the toothed portion is equal to the width of the teeth of a normal sprocket. The sum of the diameter of the sprocket and the thickness of the two side walls of the toothed portion is equal to the diameter of a normal sprocket.

10. A sprocket suitable for the sprocket guard of claim 5, characterized in that, The sprocket has several threaded holes. When the sprocket is fixedly installed in the accommodating space, several bolts are aligned and pass through the several threaded holes and the several threaded holes of the side plate to screw and fix the sprocket and sprocket guard onto the hub. The sum of the thickness of the sprocket teeth and the thickness of the tooth protrusion of the side plate is equal to the thickness of the teeth of a normal sprocket. The sum of the width of the sprocket teeth and the thickness of the two side walls of the toothed portion is equal to the width of the teeth of a normal sprocket. The sum of the diameter of the sprocket and the thickness of the two side walls of the toothed portion is equal to the diameter of a normal sprocket.

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