A drive element and sprocket for a saw chain

Abstract

A kind of transmission element and sprocket applied to saw chain, relate to chain transmission technical field, the transmission element is the structure of toothed chain plate, the first protruding tooth of the bottom of the transmission element is non-complete tooth shape, the second protruding tooth is complete tooth shape, the outer periphery of the sprocket is evenly distributed with several tooth groove structures, which are engaged with the first protruding tooth and the second protruding tooth, the tooth groove structure between adjacent tooth groove structures forms the gear teeth of the sprocket, the tooth groove structure includes the left tooth groove wall matched with the left side wall of the first protruding tooth and the right tooth groove wall matched with the right side wall of the second protruding tooth.The transmission element and sprocket applied to saw chain are provided, the transmission element and sprocket are not only improved the strength of the sprocket and ensured the system reliability on the basis of ensuring lightweight, but also have certain benefits for system lubrication and transmission accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chain transmission technology, in particular to a transmission element and a sprocket applied to a saw chain. BACKGROUND

[0002] In the field of chain transmission, in order to improve transmission efficiency and reduce transmission loss, the demand for lightweight products is becoming more and more prominent. In the field of saw chain, this demand is also urgent, especially with the popularization and promotion of lithium electric saw, higher requirements are put forward for the portability of the product, but due to the limitation of traditional saw chain structure and meshing transmission mode, the lightweight improvement of saw chain has not made breakthrough progress.

[0003] According to the defects of the prior art, it is necessary to improve the transmission element and the sprocket of the existing saw chain, to improve the strength and reliability of the system on the basis of lightweight, so as to improve the quality of the transmission system of the lithium electric saw. SUMMARY

[0004] The present application provides a transmission element and a sprocket applied to a saw chain, which is designed on the basis of ensuring lightweight, and the shape of the sprocket is designed creatively, which not only improves the strength of the sprocket and ensures the reliability of the system, but also helps the system lubrication and transmission accuracy.

[0005] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0006] A transmission element and a sprocket applied to a saw chain, the transmission element is a tooth-shaped chain plate structure, the first protruding tooth at the bottom of the transmission element is a non-complete tooth shape, and the second protruding tooth is a complete tooth shape, a plurality of tooth groove structures which are engaged with the first protruding tooth and the second protruding tooth are uniformly distributed on the outer periphery of the sprocket, and the adjacent tooth groove structures form the gear teeth of the sprocket, and the tooth groove structure includes a left tooth groove wall matched with the left side wall of the first protruding tooth and a right tooth groove wall matched with the right side wall of the second protruding tooth.

[0007] Preferably, the non-complete tooth shape is a tooth shape structure with the bottom sharp corner removed, and the tooth groove structure is provided with a boss matched with the bottom of the non-complete tooth shape.

[0008] Preferably, the boss is provided with a protrusion away from the left tooth groove wall, and the protrusion is matched with the right end of the bottom of the non-complete tooth shape.

[0009] Preferably, when the left side wall of the first protruding tooth and the right side wall of the second protruding tooth are worn to a certain degree, the boss is in contact with the bottom of the non-complete tooth shape, and the non-complete tooth shape is lifted to avoid the saw chain containing the transmission element from being subjected to excessive tension due to the transmission element sinking too deep into the tooth groove.

[0010] Preferably, when the first protruding tooth left side wall and the second protruding tooth right side wall are worn to a certain extent, the protruding table contacts the bottom of the incomplete tooth shape, and the protrusion engages the right end of the bottom of the incomplete tooth shape to prevent the first protruding tooth left side wall and the second protruding tooth right side wall from being worn to cause the saw chain containing the transmission element to engage the sprocket poorly.

[0011] Preferably, a first groove is provided between the incomplete tooth shape and the complete tooth shape, and the first groove includes a left groove wall, a right groove wall, and a groove bottom in the middle.

[0012] Preferably, a second groove is provided between the protrusion and the right tooth groove wall.

[0013] Preferably, the transmission element is provided with two chain plate holes, and the center of gravity of the transmission element is located near the median line of the line connecting the centers of the two chain plate holes.

[0014] Preferably, the center of gravity of the transmission element is within a range of 20% of the hole center distance offset to the left and right of the median line.

[0015] Preferably, the left shoulder and the right shoulder of the transmission element are both chamfered structures.

[0016] The transmission element and the sprocket applied to the saw chain have the following advantages: The present application breaks through the design idea of the traditional lithium electric saw transmission element and sprocket, and through the structural design of the transmission element and the sprocket, the weight reduction effect is obvious, the lightweight of the lithium electric saw transmission system is realized, and the sprocket has the characteristics of high strength and accurate positioning. The transmission element and the sprocket cooperate to have good lubrication effect, and when the transmission element is worn to a certain extent, the transmission element can be lifted by the protruding table and engaged by the protrusion in two stages, thereby avoiding the problems of excessive stress and poor engagement of the saw chain caused by excessive wear of the transmission element. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The transmission element structure diagram of the present application;

[0018] Figure 2 The center of gravity range diagram of the transmission element of the present application;

[0019] Figure 3 The sprocket structure diagram of the present application;

[0020] Figure 4 The schematic diagram of the transmission element and the sprocket engagement of the present application (provided with a protrusion);

[0021] Figure 5 The schematic diagram of the transmission element and the sprocket engagement of the present application (not provided with a protrusion);

[0022] 1. left shoulder; 2. top; 3. right shoulder; 4. right wall; 5. second protrusion right wall; 6. right groove wall; 7. groove bottom; 8. left groove wall; 9. non-complete tooth shape bottom; 10. first protrusion left wall; 11. left wall; 12. center of gravity; 13. center of gravity range; 14. left gullet wall; 15. right gullet wall; 16. boss; 17. protrusion; 18. second groove; 19. position of two-step engagement; 20. position of complete tooth shape easy to wear; 21. position without protrusion. DETAILED DESCRIPTION

[0023] The following detailed description of the embodiments of the application is provided as an example to the preferred embodiment of the application, and is not intended to limit the scope of protection of the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the scope of protection of the application.

[0024] In the description of the application, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as a limitation on the application.

[0025] Example 1

[0026] A transmission element and a sprocket applied to a saw chain, as shown in Figure 1 、 2 , the transmission element is a tooth-shaped chain plate structure, the first protrusion at the bottom of the transmission element is a non-complete tooth shape, and the second protrusion is a complete tooth shape, as shown in Figure 3 、 4 , 5, the sprocket is uniformly distributed with a plurality of gullet structures which are engaged with the first protrusion and the second protrusion at the same time, and the adjacent gullet structures form the teeth of the sprocket, the gullet structure includes the left gullet wall 14 matched with the left wall of the first protrusion 10 and the right gullet wall 15 matched with the right wall of the second protrusion 5.

[0027] In this embodiment, as shown in Figure 4 、 5 , by improving the sprocket, the transmission element and the engagement mode of the two, the stable transmission relationship between the sprocket and the saw chain containing the transmission element can be maintained, and at the same time, the mass of the transmission element and the sprocket can be greatly reduced by this improvement, realizing the lightweight of the lithium electric saw chain transmission system. The gullet structure of the sprocket and the gullet of the chain plate are completely filled in the traditional regular sprocket and chain plate engagement, resulting in a large mass of the chain system and inconvenience for lubrication.

[0028] AsFigure 1 、 2 As shown in the figure, the first protruding tooth left side wall 10 and the second protruding tooth right side wall 5 are the main force receiving parts of the transmission element, wherein, as shown in the figure, Figure 4 、 5 The second protruding tooth right side wall 5 receives greater force compared with the first protruding tooth left side wall 10. The first protruding tooth is designed as a non-complete tooth shape, which not only reduces the mass of the first protruding tooth, but also prevents the problem that the chain containing the transmission element is subjected to excessive tension after the transmission element is worn to a certain extent. In addition, the non-complete tooth shape cooperates with the tooth groove structure of the sprocket to realize two-stage meshing transmission after the transmission element is worn to a certain extent, thereby avoiding the poor meshing of the chain and the sprocket caused by excessive wear of the transmission element.

[0029] As shown in the figure, Figure 3 After improvement of the sprocket, the outer periphery of the sprocket is different from the regular tooth structure of the conventional sprocket. The tooth groove structure of the sprocket realizes greater weight reduction effect, facilitates storage of lubricating oil, and prolongs the service life of the chain system.

[0030] In summary, the application breaks through the limitations of the conventional sprocket and chain plate design ideas, designs a sprocket and a transmission element with a unique structure, and realizes the above beneficial effects.

[0031] Example 2:

[0032] Based on example 1, the present embodiment further discloses:

[0033] As shown in the figure, Figures 1-5 The non-complete tooth shape is a tooth shape structure with the bottom sharp corner removed, and the tooth groove structure bottom is provided with a boss 16 cooperating with the non-complete tooth shape bottom 9.

[0034] As shown in the figure, Figures 1-5 The boss 16 away from the left tooth groove wall is provided with a protrusion 17, and the protrusion 17 cooperates with the right end of the non-complete tooth shape bottom 9.

[0035] As shown in the figure, Figures 1-5 When the first protruding tooth left side wall and the second protruding tooth right side wall are worn to a certain extent, the boss 16 contacts the bottom of the non-complete tooth shape, and the non-complete tooth shape bottom is lifted to avoid the problem that the saw chain containing the transmission element is subjected to excessive tension caused by the transmission element sinking into the tooth groove too deeply. As shown in the figure, Figure 4 、 5 After excessive wear, if there is no boss, the contact area of the right tooth groove wall and the second protruding tooth right side wall will increase significantly, resulting in that the saw chain is subjected to greater tension.

[0036] As shown in the figure, Figures 1-4As shown, when the first protruding tooth left side wall and the second protruding tooth right side wall are worn to a certain extent, the boss 16 contacts the bottom of the non-complete tooth shape, and the protrusion 17 engages the right end of the bottom of the non-complete tooth shape to prevent the first protruding tooth left side wall and the second protruding tooth right side wall from being worn to cause the saw chain containing the transmission element to be not engaged with the sprocket.

[0037] In this embodiment, the second protruding tooth right side wall 5 is the main stress area, and in the process of engaging with the sprocket to transmit power, this area is subjected to the largest stress. In order to ensure transmission efficiency and improve the reliability of the transmission element, the stress area should be as large as possible, so the second protruding tooth is designed as a complete tooth shape. The design of the non-complete tooth shape bottom removing the sharp corner can avoid interference with the sprocket tooth top during transmission, in addition to the aforementioned effects. In addition to the above effects, the boss can also strengthen the strength of the sprocket tooth part, prolong the service life of the sprocket, and at the same time, the boss, the protrusion and the left tooth groove wall form an oil storage structure, which is convenient for storing lubricating oil. After rotating a certain angle, the lubricating oil splashes outward along the left tooth groove wall under the action of inertia, which plays a role in lubrication and cooling.

[0038] Embodiment 3:

[0039] Based on embodiments 1 and 2, this embodiment further discloses:

[0040] As shown in Figures 1-5 , the non-complete tooth shape and the complete tooth shape are provided with a first groove, and the first groove includes a left groove wall 8, a right groove wall 6 and a groove bottom 7 located in the middle. The first groove can significantly reduce the weight of the transmission element, and at the same time, the existence of the groove can bring out more lubricating oil during the operation of the saw chain, which plays a role in lubrication and cooling of the entire system, prolonging the service life.

[0041] As shown in Figures 3-5 , the protrusion 17 and the right tooth groove wall 15 are provided with a second groove 18, and the effect of the second groove 18 is the same as that of the first groove. The first groove of the transmission element and the irregular tooth groove structure of the outer periphery of the sprocket together increase the surface area and improve the heat dissipation efficiency.

[0042] Embodiment 4:

[0043] Based on embodiments 1, 2 and 3, this embodiment further discloses:

[0044] As shown in Figures 1-2 , the transmission element is provided with two chain plate holes, and the center of gravity of the transmission element is located near the median line of the line connecting the centers of the two chain plate holes.

[0045] As shown in Figures 1-2 , the center of gravity range 13 of the transmission element is located within the range of the center distance offset by 20% to the left and right of the median line.

[0046] Embodiment 5:

[0047] On the basis of Embodiments 1, 2, 3 and 4, this embodiment further discloses that:

[0048] As shown in Figures 1-2 the left shoulder 1 and the right shoulder 3 of the transmission element are both chamfered structures, and the purpose of the chamfered structure is to remove excess weight and prevent interference with related elements during transmission.

[0049] As shown in Figure 5 the protrusion 17 can also be cancelled in the case of low machining precision and technical effect requirement.

Claims

1. A drive assembly for a saw chain, said drive assembly comprising a drive element and a sprocket, characterized in that: The transmission element is a toothed chain plate structure, the first protruding tooth at the bottom of the transmission element is a non-complete tooth shape, the second protruding tooth is a complete tooth shape, the outer periphery of the sprocket is uniformly distributed with a plurality of tooth groove structures which are simultaneously engaged with the first protruding tooth and the second protruding tooth, and the adjacent tooth groove structures form the sprocket teeth, the tooth groove structure comprises a left tooth groove wall matched with the left side wall of the first protruding tooth and a right tooth groove wall matched with the right side wall of the second protruding tooth; The non-complete tooth shape is a tooth shape structure with the bottom sharp corner removed, and the tooth groove structure is provided with a boss matched with the bottom of the non-complete tooth shape; The end of the boss away from the left tooth groove wall is provided with a protrusion matched with the right end of the bottom of the non-complete tooth shape; When the left side wall of the first protruding tooth and the right side wall of the second protruding tooth are worn to a certain extent, the boss is in contact with the bottom of the non-complete tooth shape, and the non-complete tooth shape bottom is lifted to avoid the saw chain containing the transmission element from being subjected to excessive tension due to the transmission element sinking into the tooth groove too deep; When the left side wall of the first protruding tooth and the right side wall of the second protruding tooth are worn to a certain extent, the boss is in contact with the bottom of the non-complete tooth shape, and the protrusion is engaged with the right end of the bottom of the non-complete tooth shape to prevent the saw chain containing the transmission element from being engaged with the sprocket due to the wear of the left side wall of the first protruding tooth and the right side wall of the second protruding tooth; The non-complete tooth shape and the complete tooth shape are provided with a first groove, and the first groove comprises a left groove wall, a right groove wall and a groove bottom in the middle; The protrusion and the right tooth groove wall are provided with a second groove; When the transmission element is engaged with the sprocket, the first groove and the second groove form a non-filled area.

2. A drive assembly for a saw chain as defined in claim 1, characterized in that The transmission element is provided with two chain plate holes, and the center of gravity of the transmission element is located near the median line of the connecting line of the two chain plate hole centers.

3. A drive assembly for a saw chain as defined in claim 2, characterized in that: The center of gravity of the transmission element is located in the range of 20% offset of the hole center distance to the left and right of the median line.

4. A drive assembly for a saw chain as claimed in claim 1 or 2 or 3, characterized in that: The left shoulder and the right shoulder of the transmission element are both chamfered structures.

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