Chain saw clutch

Abstract

The utility model belongs to the field of chain saw accessories, and particularly relates to a chain saw clutch. The chain saw clutch comprises a clutch drum and a clutch shaft, and is characterized in that the clutch drum comprises an integrally formed clutch drum disc and a clutch drum shell arranged along the edge of the clutch drum disc, a through hole is formed in the center of the clutch drum disc, and the clutch shaft comprises a clutch shaft body. A mounting hole is formed in the axis of the clutch shaft body, transmission teeth are arranged on the surface of the clutch shaft body, a mounting circumferential surface is arranged on the clutch shaft body beside the transmission teeth, the mounting circumferential surface is sleeved with the through hole of the clutch drum disc, the surface of the clutch drum disc is tightly attached to the surface of the transmission teeth, and the clutch drum disc is fixedly connected with the clutch shaft; the chain saw clutch is simple in structure, reliable in strength and high in precision.

Description

Technical Field

[0001] The utility model belongs to the field of chain saw accessories, in particular to a chain saw clutch. Background Art

[0002] A chainsaw, also known as a gasoline chain saw or a gasoline-powered saw, is a commonly used garden machinery tool.

[0003] It includes a clutch, which is used to realize power transmission between a power source and a saw blade. The clutch in the prior art includes a clutch shaft and a clutch drum. The clutch drum is welded and fixed on the cross section of the clutch shaft. During the welding process, the positioning accuracy of the two cannot be guaranteed, resulting in poor dimensional accuracy of the product and a high defective rate. In addition, during the welding process, after high-temperature welding, the thickness of the clutch drum is different from that of the clutch shaft. During the welding process, the clutch drum is also prone to welding deformation, which will also affect the quality of the product. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model designs a chain saw clutch which has a simple structure, reliable strength and high precision.

[0005] The technical solution of the utility model is as follows:

[0006] A chainsaw clutch comprises a clutch drum and a clutch shaft, wherein the clutch drum comprises an integrally formed clutch drum disc and a clutch drum shell arranged along the edge of the clutch drum disc, a through hole is arranged at the center of the clutch drum disc, and the clutch shaft comprises a clutch shaft body, a mounting hole is arranged on the axis of the clutch shaft body, a transmission tooth is arranged on the surface of the clutch shaft body, a mounting circumferential surface is arranged on the clutch shaft body next to the transmission tooth, the through hole of the clutch drum disc is sleeved on the mounting circumferential surface, and the surface of the clutch drum disc is tightly attached to the surface of the transmission tooth, and the clutch drum disc is fixedly connected to the clutch shaft.

[0007] Furthermore, a groove is provided at the connection between the mounting circumferential surface and the side surface of the transmission tooth, and the groove includes a vertical surface extending from the surface of the clutch shaft body to the axial direction, the end of the vertical surface is connected to an arc surface, the end of the arc surface is connected to an inclined surface, and the end of the inclined surface is connected to the surface of the clutch shaft body.

[0008] Furthermore, the angle between the inclined surface and the vertical surface is 55°.

[0009] Furthermore, a chamfer is provided on the mounting circumferential surface near the end of the clutch shaft body.

[0010] Furthermore, a circle of heat dissipation holes is distributed around the surface of the clutch drum.

[0011] Furthermore, the clutch shaft is made of 20CrMo.

[0012] In summary, the utility model has the following beneficial effects:

[0013] 1. The utility model improves the structure of the chain saw clutch, wherein the clutch shaft and the clutch drum are processed separately, and then the two are assembled and fixedly connected to form a whole.

[0014] 2. The utility model further improves the connection between the clutch drum and the clutch shaft by adding a groove. The groove provides a holding space. During the brazing and fixing process of the clutch drum and the clutch shaft, the brazing agent will enter between the clutch drum and the clutch shaft. The groove can hold excess brazing agent, thereby avoiding uneven brazing agent between the clutch drum and the clutch shaft. The problem of poor coaxiality between the clutch drum and the clutch shaft caused by uneven brazing agent is overcome, and the reliability of the connection between the clutch drum and the clutch shaft and the positioning accuracy between the two are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of an embodiment of the utility model;

[0016] Figure 2 for Figure 1 A schematic cross-sectional view of AA;

[0017] Figure 3 for Figure 2 The enlarged schematic diagram of P in the middle;

[0018] Figure 4 A rear view schematic diagram of an embodiment of the utility model;

[0019] In the figure, 1 is a clutch drum, 10 is a clutch drum plate, 100 is a through hole, 101 is a heat dissipation hole, 11 is a clutch drum shell,

[0020] 2 is a clutch shaft, 20 is a clutch shaft body, 21 is a mounting hole, 22 is a transmission tooth, 23 is a mounting peripheral surface, 230 is a groove, 231 is a vertical surface, 232 is an arc surface, 233 is an inclined surface, and 234 is a chamfer. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0022] It should be noted that when an element is referred to as being "disposed on" or "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "fixed on" another element, or "fixedly connected" to another element, they may be fixed in a detachable manner or in a non-detachable manner. When an element is considered to be "connected" or "rotatably connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used are for illustrative purposes only and do not represent the only implementation method.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to restrict the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] The terms “first”, “second”, “third” and the like in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0025] join Figures 1 to 4 As shown, the chain saw clutch comprises a clutch drum 1 and a clutch shaft 2, wherein the clutch drum 1 comprises an integrally formed clutch drum disc 10 and a clutch drum shell 11 arranged along the edge of the clutch drum disc, and the clutch drum can be integrally formed by a stamping and stretching process, or can be integrally cast, or can also be formed by cutting, and a through hole 100 is provided at the center of the clutch drum disc 10, and the clutch shaft 2 comprises a clutch shaft body 20, and a mounting hole 21 is provided on the axis of the clutch shaft body 20, and a transmission tooth 22 is provided on the surface of the clutch shaft body 20, and a mounting circumferential surface 23 is provided on the clutch shaft body 20 next to the transmission tooth 22, and the through hole 100 of the clutch drum disc is sleeved on the mounting circumferential surface 23, and the surface of the clutch drum disc 10 is tightly attached to the surface of the transmission tooth 22, and the clutch drum disc 10 is fixedly connected to the clutch shaft 2.

[0026] The utility model improves the structure of the oil circuit clutch, and adopts a clutch drum and a clutch shaft to be processed separately, and then connected and fixed to obtain an integral oil saw clutch. The separate processing method can simplify the manufacturing difficulty of some structures, thereby reducing the manufacturing cost. Further, the connection method between the two is improved, the clutch drum is sleeved on the mounting circumferential surface of the clutch shaft, and the surface of the clutch drum is in close contact with the surface of the transmission tooth, thereby increasing the contact area of ​​the connection, thereby ensuring the structural strength of the two after the fixed connection.

[0027] See also Figure 2 and Figure 3 As shown, a groove 230 is provided at the connection between the mounting circumferential surface 23 and the side of the transmission tooth, and the groove 230 includes a vertical surface 231 extending from the surface of the clutch shaft body to the axial direction, and the end of the vertical surface is connected to an arc surface 232, and the end of the arc surface 232 is connected to an inclined surface 233, and the end of the inclined surface is connected to the surface of the clutch shaft body. First, the provided groove provides a accommodating space, and in the process of fixing the clutch drum and the clutch shaft by brazing, a accommodating space can be provided for excess brazing material, thereby ensuring the uniformity of the brazing material between the clutch drum and the transmission tooth cross section, and preventing the problem of coaxiality between the clutch drum and the clutch shaft caused by poor uniformity of the brazing material, thereby ensuring the positioning accuracy of the two fixed, and the groove adopts an arc surface transition, and there is no sharp corner, so that there will be no stress accumulation area during the brazing process.

[0028] See also Figure 3 As shown, the angle between the inclined surface and the vertical surface is 55°. The angle is limited here. On the one hand, it ensures the volume in the groove, avoids the inclined surface from tilting too much and encroaching on the contact area between the mounting hole and the mounting surface of the clutch drum, and further ensures the connection reliability between the clutch drum and the clutch shaft.

[0029] See also Figure 3 As shown, a chamfer 234 is provided on the mounting surface 23 near the end of the clutch shaft 20. The chamfer is provided on the clutch shaft, and the angle of the chamfer is 15°, which plays a guiding role, facilitates the assembly of the clutch drum and the clutch shaft, and increases the assembly speed.

[0030] The clutch drum 10 has a circle of heat dissipation holes 101 distributed around its surface. The heat dissipation holes can increase the air flow in the clutch drum to avoid the problem of excessively high operating temperature, and also facilitate the removal of dust generated by friction in the clutch drum.

[0031] Furthermore, the clutch shaft is made of 20CrMo.

[0032] In summary, the utility model has the following beneficial effects:

[0033] 1. The utility model improves the structure of the chain saw clutch, wherein the clutch shaft and the clutch drum are processed separately, and then the two are assembled and fixedly connected to form a whole.

[0034] 2. The utility model further improves the connection between the clutch drum and the clutch shaft by adding a groove. The groove provides a holding space. During the brazing and fixing process of the clutch drum and the clutch shaft, the brazing agent will enter between the clutch drum and the clutch shaft. The groove can hold excess brazing agent, thereby avoiding uneven brazing agent between the clutch drum and the clutch shaft. The problem of poor coaxiality between the clutch drum and the clutch shaft caused by uneven brazing agent is overcome, and the reliability of the connection between the clutch drum and the clutch shaft and the positioning accuracy between the two are ensured.

[0035] Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

Claims

1. A chain saw 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 arranged along the edge of the clutch drum disc. A through hole is provided at the center of the clutch drum disc. The clutch shaft includes a clutch shaft body. A mounting hole is provided on the axis of the clutch shaft body. A transmission tooth is provided on the surface of the clutch shaft body. A mounting circumferential surface is provided on the clutch shaft body next to the transmission tooth. The through hole of the clutch drum disc is sleeved on the mounting circumferential surface, and the surface of the clutch drum disc is tightly attached to the surface of the transmission tooth. The clutch drum disc is fixedly connected to the clutch shaft.

2. The chain saw clutch according to claim 1, characterized in that: A groove is provided at the connection between the mounting circumferential surface and the side surface of the transmission tooth. The groove includes a vertical surface extending from the surface of the clutch shaft body to the axial direction. The end of the vertical surface is connected to an arc surface. The end of the arc surface is connected to an inclined surface. The end of the inclined surface is connected to the surface of the clutch shaft body.

3. The chain saw clutch according to claim 2, characterized in that: The angle between the inclined surface and the vertical surface is 55°.

4. The chain saw clutch according to claim 1, characterized in that: A chamfer is arranged on the mounting circumferential surface close to the end of the clutch shaft body.

5. The chain saw clutch according to claim 1, characterized in that: A circle of heat dissipation holes is distributed around the surface of the clutch drum.

6. The chain saw clutch according to any one of claims 1 to 5, characterized in that: The clutch shaft is made of 20CrMo.

Images