CN-121989327-A - Chain saw with saw chain tensioning structure

Abstract

The invention discloses a chain saw with a saw chain tensioning structure, which comprises a main body, a driving chain wheel, a guide plate and a saw chain, wherein the main body is provided with the saw chain tensioning structure, the saw chain tensioning structure is provided with an adjusting screw rod, and the front side of the adjusting screw rod is provided with a thread transmission part subjected to hardening heat treatment for transmission adjustment and stress support. Through the design, the invention constructs the complete core technical scheme of the chain saw chain tensioning structure, and fundamentally solves the core pain points of poor shock resistance, insufficient durability, incapability of considering both operation convenience and user suitability, poor structural tightness and high processing and manufacturing cost of the tensioning structure in the prior art.

Inventors

• Ying Yiheng
• HUANG XIDONG
• HU HONGYAN
• HUANG HUIFEI
• SUN YINGYING
• Ying Kuo
• YING XINSEN
• SUN LIANGLIANG
• Ye Maohu
• CHEN YI
• XU FENG

Assignees

• 浙江三锋实业股份有限公司

Dates

Publication Date

20260508

Application Date

20260325

Claims (10)

1. 1. A chain saw with a saw chain tensioning structure comprises a main body (1), a driving chain wheel (2), a guide plate (3) and a saw chain (4), and is characterized in that the main body (1) is provided with the saw chain tensioning structure (5), the saw chain tensioning structure (5) is provided with an adjusting screw rod (51), the front side of the adjusting screw rod (51) is provided with a thread transmission part (52) subjected to hardening heat treatment and used for transmission adjustment and stress support, the thread transmission part (52) is provided with an adjusting pin (53) connected with the guide plate (3) and used for adjusting the position of the guide plate (3), the rear side of the thread transmission part (52) is provided with a sealing pressing piece (54) and used for limiting the axial direction of the adjusting screw rod (51) and sealing the thread transmission part (52), the rear side of the adjusting screw rod (51) is provided with an adjusting knob (55) and used for preventing the adjusting screw rod (51) from being rotated by a tool, and the front side of the thread transmission part (52) is provided with a tool adjusting part (56) and used for rotating the adjusting screw rod (51) in cooperation with a tool.
2. 2. A chain saw with a saw chain tensioning structure as claimed in claim 1, wherein the rear side of the adjusting screw (51) is provided with a flat structure (57), the flat structure (57) being fitted in the adjusting knob (55).
3. 3. A chain saw with a saw chain tensioning structure according to claim 1, wherein the sealing pressing piece (54) is a U-shaped pad, the main body (1) is provided with a mounting groove (11), the sealing pressing piece (54) is clamped in the mounting groove (11), the U-shaped inner side of the sealing pressing piece (54) presses and fits with the outer peripheral surface of the adjusting screw (51), and the U-shaped outer side of the sealing pressing piece (54) seals a fit gap between the mounting groove (11) and the adjusting screw (51).
4. 4. The chain saw with the saw chain tensioning structure according to claim 1, wherein the main body (1) is provided with a sliding groove (12), the threaded transmission part (52) and the adjusting pin (53) are both located in the sliding groove (12), a buffer gasket (58) is arranged on the front side of the threaded transmission part (52), the buffer gasket (58) is clamped on the outer side of the sliding groove (12), and the tool adjusting part (56) presses against the buffer gasket (58).
5. 5. A chain saw with a saw chain tensioning structure as in claim 4, wherein the buffer spacer (58), the adjusting pin (53), and the adjusting screw (51) are pre-assembled as an integrated structure for an automatic production line.
6. 6. A chain saw with a saw chain tensioning arrangement according to claim 1, characterized in that the main body (1) is provided with a fixing bracket (14), the fixing bracket (14) limiting and fixing the saw chain tensioning arrangement (5) in the main body (1).
7. 7. A chain saw with a saw chain tensioning structure as set forth in claim 6, wherein the fixing bracket (14) is provided with a tool adjusting hole (13) corresponding to the position of the tool adjusting portion (56), and the tool adjusting portion (56) is provided with a screwdriver adjusting groove.
8. 8. A chain saw with a saw chain tensioning structure according to claim 1, characterized in that the main body (1) is provided with a cover plate (15), the cover plate (15) is provided with a compression knob (16), the compression knob (16) is in threaded connection with the main body (1), and the cover plate (15) is clamped with the main body (1).
9. 9. A chain saw with a saw chain tensioning structure as in claim 6, wherein the fixing bracket (14) is a screw fixing connection structure with the main body (1).
10. 10. A chain saw with a saw chain tensioning structure as claimed in claim 2, wherein the adjustment knob (55) is provided with a limit groove, and the flat structure (57) is embedded in the limit groove of the adjustment knob (55).

Description

Chain saw with saw chain tensioning structure Technical Field The invention relates to the technical field of chain saws, in particular to a chain saw with a saw chain tensioning structure. Background The chain saw is a portable electric tool which takes a motor as a power source and drives a saw chain to circularly move along a guide plate to realize wood cutting, and is widely applied to many scenes such as felling operation, garden pruning, wood processing, building section cutting and the like by virtue of the advantages of high cutting efficiency, flexible operation and strong portability, and is core operation equipment in the fields of forestry production, gardening maintenance and household construction. Along with the continuous expansion of the application field of the chain saw, the group of end users is continuously expanded, and higher requirements are put on the operation safety, the use convenience, the structural durability and the production economy of chain saw products. The saw chain tensioning structure is a core functional component of the chain saw, the core of which is to adjust and stably maintain the tensioning state of the saw chain on the guide plate. The saw chain tension is too loose, so that the problems of chain jump and chain release easily occur in the high-speed operation process, serious safety accidents are caused, and the saw chain tension is too tight, so that the abrasion of the saw chain, the guide plate and the driving chain wheel is increased, the operation load of a motor is increased, and the service life of the whole machine is shortened. Therefore, the performance of the saw chain tensioning structure is good and bad, and the use safety, the operation stability and the service life of the whole machine of the chain saw are directly determined. Traditional instrument auxiliary type tensioning structure, this kind of structure need drive baffle translation through rotatory adjusting screw and realize the rate of tension and adjust with the help of specialized tool such as screwdriver, and though structural principle is simple relatively, but operation flow is loaded down with trivial details, and the user is when outdoor operation if not carrying corresponding specialized tool, just can't accomplish the real-time regulation of saw chain rate of tension, seriously influences the continuity and the flexibility of operation, is difficult to satisfy the user demand of on-the-spot quick regulation. For solving the operation pain point of traditional instrument regulation formula structure, the skilled artisan has researched and developed multiple instrument-free quick tensioning structure, through setting up adjust knob and adjusting transmission mechanism, realizes the saw chain rate of tension fast adjustment that need not appurtenance, has promoted the simple operation by a wide margin. However, in practical applications, there are still many technical drawbacks that are difficult to overcome in such tool-less tensioning structures: 1. The structure has poor impact resistance and insufficient durability. The existing adjusting screw stress supporting points of the tool-free tensioning structure are concentrated at the rear end of the screw rod, which is installed by the adjusting knob, and in the chain saw operation process, the cutting reverse impact force received by the guide plate and the tensioning reaction force of the saw chain can be directly transmitted to the rear end of the screw rod, so that the adjusting screw rod is extremely easy to bend and deform and even break failure problems under the long-term high-frequency impact load effect, the service life of the tensioning structure is greatly shortened, and the safety accident of the loosening of the saw chain is more likely to be caused. In order to improve the shock resistance, part of the scheme needs to additionally add shock-resistant metal parts on the main shell to absorb the shock force, so that the number of parts is increased, the structural complexity is further improved, and the problem of easy failure caused by unreasonable stress of the screw rod cannot be fundamentally solved. 2. The production and processing difficulty is high, the manufacturing cost is high, and the assembly efficiency is low. Meanwhile, the existing tensioning adjusting assembly has a large number of parts, complicated assembly procedures, complete assembly step by relying on manpower, and cannot meet the rapid assembly requirement of an automatic production line, so that the production efficiency is low, the manufacturing cost of products is further increased, and the economic requirement of large-scale mass production is difficult to meet. 3. The structural tightness is poor and the environmental adaptability is weak. A large amount of saw dust, dust can be produced in the chain saw operation process, there is the cooperation gap between accommodate the lead screw of current tensioning structure and the main casing, an