Improved chain saw clutch

Abstract

The utility model belongs to the field of oil saw accessory, especially relate to an improved oil saw clutch, it includes clutch drum and clutch shaft, clutch drum include clutch drum disc and clutch drum shell, the centre of clutch drum disc is punch formed with round recess area, is equipped with a through -hole in the centre of recess area, clutch shaft includes clutch shaft body, is equipped with mounting hole on the axis of clutch shaft body, the surface of clutch shaft body is equipped with transmission tooth part, is equipped with the installation peripheral surface on clutch shaft body in transmission tooth part side, still is equipped with extension shaft body in one end of installation peripheral surface, the outer peripheral surface of extension shaft body is polygon, the through -hole of clutch drum disc is covered on the installation peripheral surface, transmission tooth part is located the outside of clutch drum shell, the extension shaft body of the utility model is located the inside of clutch drum shell, the utility model is convenient for to the positioning and fixed of clutch shaft, is favorable to guarantee the positioning accuracy of clutch drum and clutch shaft, thereby has guaranteed the dimensional accuracy of product.

Description

Technical Field

[0001] This utility model belongs to the field of chainsaw accessories, and specifically relates to an improved chainsaw clutch. Background Technology

[0002] A chainsaw, also known as a gasoline chainsaw or gasoline-powered chainsaw, is a commonly used garden machinery tool. It includes a clutch, which transmits power between the power source and the saw blade. Current clutches consist of a clutch shaft and a clutch drum, with the clutch drum welded to the cross-section of the clutch shaft. During the welding process, the positioning accuracy of both components cannot be guaranteed, resulting in poor dimensional accuracy and a high defect rate. Furthermore, the high temperature during welding causes the thickness of the clutch drum to differ from that of the clutch shaft, and the clutch drum is also prone to welding deformation, further affecting product quality.

[0003] Previously, our company applied for a chainsaw clutch, but the chainsaw clutch encountered difficulties during installation, so we made improvements to the chainsaw clutch. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides an optimized chainsaw clutch, which has an extension shaft on the clutch shaft body, and the surface of the extension shaft body is polygonal, which facilitates the installation and fixation of the clutch shaft.

[0005] The technical solution of this utility model is as follows: An improved chainsaw clutch includes a clutch drum and a clutch shaft. The clutch drum comprises an integrally formed clutch drum disc and a clutch drum shell along the edge of the clutch drum disc. A circular recessed area is stamped at the center of the clutch drum disc, and a through hole is provided at the center of the recessed area. The clutch shaft includes a clutch shaft body with a mounting hole on its axis. A transmission gear is provided on the surface of the clutch shaft body, and a mounting circumferential surface is provided on the clutch shaft body next to the transmission gear. An extension shaft is also provided at one end of the mounting circumferential surface. The outer circumferential surface of the extension shaft is polygonal. The through hole of the clutch drum disc fits onto the mounting circumferential surface, and the outer surface of the recessed area is in close contact with the surface of the transmission gear. The transmission gear is located outside the clutch drum shell, and the extension shaft is located inside the clutch drum shell.

[0006] A groove is provided at the connection between the mounting peripheral surface and the side of the transmission gear. The groove includes a vertical surface extending from the surface of the transmission gear along the axial direction. An arc surface is connected to the end of the vertical surface, and an inclined surface is connected to the end of the arc surface. The end of the inclined surface is connected to the surface of the transmission gear.

[0007] Furthermore, the angle between the inclined surface and the surface of the transmission teeth is 30°±5°.

[0008] Furthermore, a chamfer is provided on the mounting surface near one end of the extension shaft.

[0009] Furthermore, the transmission gear section includes seven transmission teeth evenly distributed on the clutch shaft, and the included angle between the tooth surfaces of adjacent transmission teeth is 80°±0.5°.

[0010] Furthermore, the transmission gears are connected to the clutch shaft via a circular arc surface, the radius of which is 1.8 ± 0.1 mm.

[0011] Furthermore, the clutch shaft is machined from 20CrMo.

[0012] In summary, this utility model has the following beneficial effects: This utility model improves the structure of the chainsaw clutch, specifically by modifying the clutch shaft by adding an extension shaft. The outer circumference of the extension shaft is designed as a polygon, which facilitates the positioning and fixing of the clutch shaft and helps to ensure the positioning accuracy of the clutch drum and the clutch shaft, thereby ensuring the dimensional accuracy of the product. Attached Figure Description

[0013] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model; Figure 2 for Figure 1 A cross-sectional view of AA; Figure 3 This is a perspective view of a clutch shaft according to an embodiment of the present invention; Figure 4 This is a front view schematic diagram of the clutch shaft according to an embodiment of the present invention; Figure 5 for Figure 4 A cross-sectional view of BB; Figure 6 for Figure 5 A magnified view of a portion of the image; In the diagram, 1 represents the clutch drum, 10 represents the clutch drum disc, 11 represents the clutch drum housing, 100 represents the recessed area, and 12 represents the through hole. 2 is the clutch shaft, 20 is the clutch shaft body, 21 is the mounting hole, 22 is the transmission gear, 23 is the mounting circumferential surface, 24 is the extension shaft, 25 is the groove, 250 is the vertical surface, 251 is the arc surface, and 252 is the inclined surface. 220 is the transmission gear, and 230 is the chamfer. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0015] It should be noted that when a component is referred to as being "set on" or "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as being "fixed to" another component, or "fixedly connected" to another component, the fixing method can be detachable or non-detachable. When a component is considered to be "connected" or "rotatably connected" to another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used are for illustrative purposes only and do not represent the only possible implementation.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0017] In this invention, terms such as "first," "second," and "third" are used not to represent specific quantities or orders, but merely to distinguish names.

[0018] See Figures 1 to 6 As shown, an improved chainsaw clutch includes a clutch drum 1 and a clutch shaft 2. The clutch drum 1 includes an integrally formed clutch drum disc 10 and a clutch drum shell 11 disposed along the edge of the clutch drum disc. The clutch drum disc 10 has a circular recessed area 100 stamped in the center. Plastic processing is used here to increase the material strength at the center of the clutch drum disc, while simultaneously forming a convex area to reduce the contact area between the chainsaw chain and the clutch drum disc, thereby reducing wear between them. A through hole 12 is provided in the center of the recessed area 100. The clutch shaft 2 includes a clutch shaft body 20, with a mounting hole 21 on the axis of the clutch shaft body 20. The surface of the clutch shaft body 20 is provided with a transmission tooth 22. A mounting peripheral surface 23 is provided on the clutch shaft body 20 next to the transmission tooth 22. An extension shaft 24 is also provided at one end of the mounting peripheral surface 23. The outer peripheral surface of the extension shaft 24 is polygonal. The through hole 12 of the clutch drum 10 is fitted onto the mounting peripheral surface 23, and the outer surface of the recessed area 100 is in close contact with the surface of the transmission tooth. The transmission tooth is located outside the clutch drum, and the extension shaft is located inside the clutch drum.

[0019] This utility model discloses an improved chainsaw clutch, specifically improving the clutch shaft of the chainsaw clutch by adding an extension shaft. The outer circumference of the extension shaft adopts a polygonal design, which facilitates the positioning and fixing of the clutch shaft and helps to ensure the positioning accuracy of the clutch drum and the clutch shaft, thereby ensuring the dimensional accuracy of the product.

[0020] A groove 25 is provided at the connection between the mounting peripheral surface 23 and the side of the transmission gear 22. The groove 25 includes a vertical surface 250 extending from the surface of the transmission gear along the axial direction. An arc surface 251 is connected to the end of the vertical surface 250, and an inclined surface 252 is connected to the end of the arc surface 251. The end of the inclined surface is connected to the surface of the transmission gear 22. The structure of the groove has been improved, specifically the location of the groove has been improved. The groove is now located on the surface of the transmission gear. First, the groove provides a space for accommodating excess brazing material during the brazing process between the clutch drum and the clutch shaft, ensuring the uniformity of the brazing material between the end faces of the clutch drum and the transmission gear, and ensuring the coaxiality between the clutch drum and the clutch shaft. Second, by relocating the groove to the transmission gear, the channel between the surface of the clutch drum and the groove is increased, allowing the brazing material to enter the groove smoothly. This overcomes the problem of poor brazing material flow caused by the small channel between the groove and the surface of the clutch drum in the previous generation product.

[0021] The angle between the inclined surface and the surface of the transmission teeth is 30°±5°. The angle of the inclined surface is limited here to ensure the volume of the groove on the one hand, and to prevent the angle of the inclined surface from being too large and encroaching on the contact area between the end face of the transmission teeth and the clutch drum, thus ensuring the reliability of the connection between the clutch shaft and the clutch drum.

[0022] A chamfer 230 is provided on the mounting peripheral surface 23 near one end of the extension shaft. The chamfer angle is 30°, which serves as a guide, allowing the mounting peripheral surface of the clutch shaft to quickly enter the through hole and improve the assembly speed.

[0023] The transmission gear section of this utility model is described below. The transmission gear section 22 includes seven transmission teeth 220 evenly distributed on the clutch shaft. The included angle between the tooth surfaces of adjacent transmission teeth is 80°±0.5°. Specifically, the transmission teeth are evenly distributed on the clutch shaft circumferentially.

[0024] The transmission teeth are connected to the clutch shaft by a circular arc surface with a radius of 1.8 ± 0.1 mm. By limiting the structure of the transmission teeth, the reliability of the connection between the transmission teeth and the saw chain is ensured.

[0025] The clutch shaft is machined from 20CrMo.

[0026] In summary, this utility model has the following beneficial effects: This utility model improves the structure of the chainsaw clutch, specifically by modifying the clutch shaft by adding an extension shaft. The outer circumference of the extension shaft is designed as a polygon, which facilitates the positioning and fixing of the clutch shaft and helps to ensure the positioning accuracy of the clutch drum and the clutch shaft, thereby ensuring the dimensional accuracy of the product.

[0027] Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. An improved chainsaw clutch, comprising a clutch drum and a clutch shaft, characterized in that: The clutch drum includes an integrally formed clutch drum disc and a clutch drum shell disposed along the edge of the clutch drum disc. The clutch drum disc has a circular recessed area stamped in the center, and a through hole is provided in the center of the recessed area. The clutch shaft includes a clutch shaft body, and a mounting hole is provided on the axis of the clutch shaft body. The surface of the clutch shaft body is provided with transmission teeth, and a mounting peripheral surface is provided on the clutch shaft body next to the transmission teeth. An extension shaft is also provided at one end of the mounting peripheral surface. The outer peripheral surface of the extension shaft is polygonal. The through hole of the clutch drum disc is fitted onto the mounting peripheral surface, and the outer surface of the recessed area is in close contact with the surface of the transmission teeth. The transmission teeth are located outside the clutch drum shell, and the extension shaft is located inside the clutch drum shell.

2. The improved chainsaw clutch according to claim 1, characterized in that: A groove is provided at the connection between the mounting peripheral surface and the side of the transmission gear. The groove includes a vertical surface extending from the surface of the transmission gear along the axial direction. An arc surface is connected to the end of the vertical surface, and an inclined surface is connected to the end of the arc surface. The end of the inclined surface is connected to the surface of the transmission gear.

3. The improved chainsaw clutch according to claim 2, characterized in that: The angle between the inclined surface and the surface of the transmission teeth is 30°±5°.

4. The improved chainsaw clutch according to claim 1, characterized in that: A chamfer is provided on the mounting circumference near one end of the extension shaft.

5. The improved chainsaw clutch according to claim 1, characterized in that: The transmission gear section includes seven transmission teeth evenly distributed on the clutch shaft, and the included angle between the tooth surfaces of adjacent transmission teeth is 80°±0.5°.

6. The improved chainsaw clutch according to claim 5, characterized in that: The transmission gears are connected to the clutch shaft by a circular arc surface, the radius of which is 1.8±0.1mm.

7. The improved chainsaw clutch according to any one of claims 1-6, characterized in that: The clutch shaft is machined from 20CrMo.

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