Chain tensioning structure of a chainsaw

Abstract

The application discloses a conveniently-adjusted chain tensioning structure of a chainsaw, which comprises a box body, a guide plate and a brake assembly, the guide plate is arranged between the box body and the brake assembly, a tensioning structure is arranged on one side of the box body which is connected with the guide plate, the tensioning structure comprises a driving gear, a driven gear and a tensioning pin, one side of the driven gear is provided with a lead screw or a screw rod, the tensioning pin is movably arranged on the screw rod and one end of the tensioning pin is connected with the guide plate, and the driving gear can drive the driven gear and the screw rod to rotate, so that the tensioning pin can drive the guide plate to move.

Description

Technical Field

[0001] This application relates to the field of chainsaw technology, and in particular to a chainsaw chain tensioning structure that is easy to adjust. Background Technology

[0002] A chainsaw is a sawing machine powered by a gasoline engine or electric motor, commonly used for logging and timber processing. Its working principle relies on the lateral movement of L-shaped blades interlaced on a chain to perform a shearing action. The chainsaw guide plate is an important component, mainly used to control the direction of chain movement and stabilize the chain tension. Therefore, chainsaws often have a chain tensioning structure to keep the chain taut and relaxed.

[0003] For existing chainsaw chain tensioning structures, please refer to [link / reference]. Figure 1 The chain tensioning structure on a chainsaw is often located inside the brake assembly 3a, consisting of a drive gear 41a, a driven gear 42a, a screw 43a, and a tensioning pin 44a. When installing this type of chainsaw, the guide plate and the housing must be installed first, and then the tensioning pin and the pre-drilled adjustment hole on the guide plate must be aligned. However, due to the large size of the brake assembly 3a and the fact that the tensioning structure is often embedded inside the brake assembly 3a, it is difficult for users to accurately align the adjustment hole and the tensioning pin 43a with the naked eye.

[0004] Although there is another type of chain saw that integrates the tensioning mechanism into the housing, this type of structure abandons the use of gears and uses a screw-like structure to drive the tensioning pin to achieve chain tensioning. Although this adjustment method allows for quick installation, the adjustment method is more cumbersome. Therefore, the purpose of this application is to solve the above problems.

[0005] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is the closest prior art to this application. Summary of the Invention

[0006] Based on this, this application provides a conveniently adjustable chainsaw chain tensioning structure to solve one of the aforementioned technical problems.

[0007] The technical solution adopted by this application to solve its technical problem is a conveniently adjustable chainsaw chain tensioning structure, including: a housing, a guide plate, and a brake assembly. The guide plate is disposed between the housing and the brake assembly. The housing has a tensioning structure on the side connected to the guide plate. The tensioning structure includes a drive gear, a driven gear, and a tensioning pin. A lead screw or threaded rod is disposed on one side of the driven gear. The tensioning pin is movably disposed on the threaded rod and extends one end to connect with the guide plate. By driving the drive gear, the driven gear and the threaded rod can be rotated, so that the tensioning pin can drive the guide plate to move.

[0008] In some embodiments, a drive shaft is provided on one side of the drive gear to drive its rotation, and a slot or cross slot is provided on the end of the drive shaft for driving with a tool.

[0009] In some embodiments, the guide plate has a mounting groove, and the drive shaft can slide within the mounting groove.

[0010] In some embodiments, the brake assembly has an adjustment hole that can accommodate the drive shaft.

[0011] In some embodiments, the guide plate has a drive hole, and the tensioning pin can be inserted into the drive hole to drive the guide plate to move.

[0012] In some embodiments, the tensioning structure further includes a first fixing block, a second fixing block, and a cover plate. The first fixing block is rotatably connected to the end of a lead screw or threaded rod, the second fixing block is disposed on one side of the drive gear, and the cover plate is disposed on one side of the tensioning structure.

[0013] In some embodiments, a screw is provided on one side of the driven gear, and the tensioning pin is provided with an internal thread that mates with the screw.

[0014] In some embodiments, both the driving gear and the driven gear are helical gears.

[0015] The beneficial effects of this application are as follows: by integrating the tensioning structure into the housing, when the guide plate needs to be installed on the housing, the guide plate can be easily aligned with the drive gear and the tensioning pin, so that the adjustment hole of the guide plate can be directly connected with the tensioning pin to achieve the pre-adjustment of the guide plate and facilitate tension adjustment. At the same time, the drive shaft of the drive gear can appear on the adjustment hole to ensure that the tensioning structure can be adjusted by tools outside the brake assembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the brake assembly and tensioning structure in the existing technology.

[0018] Figure 2 This is a three-dimensional structural diagram of this application.

[0019] Figure 3 This is a schematic diagram of the installation of the housing and tensioning structure in this application.

[0020] Figure 4 This is a schematic diagram of the exploded structure of this application.

[0021] Appendix Figure 1 Icon number explanation:

[0022] 3a. Brake assembly; 41a. Drive gear; 42a. Driven gear; 43a. Screw; 44a. Tensioner pin;

[0023] Appendix Figure 2-4 Icon number explanation:

[0024] 1. Housing; 11. Connecting rod; 2. Guide plate; 21. Mounting slot; 22. Drive hole; 3. Brake assembly; 31. Adjustment hole; 4. Tensioning structure; 41. Drive gear; 411. Drive shaft; 42. Driven gear; 43. Screw; 44. Tensioning pin; 45. First fixing block; 46. Second fixing block; 47. Cover plate. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection of this application.

[0026] In the embodiments of this application, please refer to Figure 2-4 As shown, this application provides a conveniently adjustable chainsaw chain tensioning structure, mainly comprising: a housing 1, a guide plate 2, and a brake assembly 3. The guide plate 2 is disposed between the housing 1 and the brake assembly 3. A tensioning structure 4 is provided on the side of the housing 1 connected to the guide plate 2. The tensioning structure 4 includes a drive gear 41, a driven gear 42, and a tensioning pin 44. A lead screw or screw rod 43 is provided on one side of the driven gear 42. The tensioning pin 44 is movably disposed on the screw rod 43 and extends one end to connect with the guide plate 2. By driving the drive gear 41, the driven gear 42 and the screw rod 43 can be driven to rotate, so that the tensioning pin 44 can drive the guide plate 2 to move.

[0027] Specifically, by setting all the tensioning structures 4 on the housing 1, the user only needs to align the tensioning pin 44 during installation. One end of the tensioning pin 44 is exposed inside the housing 1, making it very easy to align and insert during installation.

[0028] The following will continue to describe some preferred / improved embodiments based on the above embodiments. Any one of the following embodiments can be selected, or multiple embodiments can be combined.

[0029] refer to Figure 2 As shown, in order for the user to drive the drive gear 41, a drive shaft 411 is provided on one side of the drive gear 41 to drive its rotation, and a slot or cross slot is provided on the end of the drive shaft 411 for driving with a tool.

[0030] refer to Figure 4 As shown, the mounting groove 21 can also cooperate with the connecting rod 11 provided on the housing 1 for mounting the brake assembly 3. The guide plate 2 is provided with the mounting groove 21, and the drive shaft 411 can slide in the mounting groove 21. At the same time, the connecting rod 11 and the drive shaft 411 should be located on the same straight line so that both can be set in the mounting groove 21 and slide.

[0031] Preferably, in order to enable the user to adjust the tensioning structure 4 when the brake assembly 3 is installed, the brake assembly 3 is provided with an adjustment hole 31 that can accommodate the drive shaft 411.

[0032] refer to Figure 4 As shown, the guide plate 2 has a drive hole 22, and the tensioning pin 44 can be inserted into the drive hole 22 and drive the guide plate 2 to move.

[0033] Preferably, in order to limit the movement distance of the tensioning pin 44 and make the tensioning structure 4 and the housing 1 closer to a whole, the tensioning structure 4 further includes a first fixing block 45, a second fixing block 46, and a cover plate 47. The first fixing block 45 is rotatably connected to the end of the lead screw or screw rod 43, the second fixing block 46 is disposed on one side of the drive gear 41, and the cover plate 47 is disposed on one side of the tensioning structure 4.

[0034] Preferably, a screw 43 is provided on one side of the driven gear 42, and an internal thread is provided on the tensioning pin 44 to cooperate with the screw 43. The screw 43 is cheaper and more cost-effective than the lead screw, so the screw 43 is used in this application.

[0035] Preferably, both the driving gear 41 and the driven gear 42 are helical gears. This configuration not only allows for the conversion of the direction of mechanical energy but also changes the horizontal height between the driving wheel and the tensioning pin 44, preventing the tensioning pin 44 from being positioned in the mounting groove 21 and thus losing its effect of adjusting the chain tension.

[0036] The various embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of this application. The foregoing embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A conveniently adjustable chainsaw chain tensioning structure, comprising a housing, a guide plate, and a brake assembly, characterized in that, The guide plate is disposed between the housing and the brake assembly. The housing has a tensioning structure on the side connected to the guide plate. The tensioning structure includes a driving gear, a driven gear, and a tensioning pin. A lead screw or threaded rod is disposed on one side of the driven gear. The tensioning pin is movably disposed on the threaded rod and extends one end to connect with the guide plate. By driving the drive gear, the driven gear and screw can be rotated, which in turn allows the tensioning pin to drive the guide plate to move.

2. The conveniently adjustable chainsaw chain tensioning structure according to claim 1, characterized in that, The drive gear has a drive shaft on one side that can be used to drive its rotation, and a slot or cross slot is provided on the end of the drive shaft for driving with a tool.

3. The conveniently adjustable chainsaw chain tensioning structure according to claim 2, characterized in that, The guide plate has a mounting groove, and the drive shaft can slide within the mounting groove.

4. The conveniently adjustable chainsaw chain tensioning structure according to claim 2, characterized in that, The brake assembly has an adjustment hole that can accommodate the drive shaft.

5. The conveniently adjustable chainsaw chain tensioning structure according to claim 1, characterized in that, The guide plate has a drive hole, and the tensioning pin can be inserted into the drive hole to drive the guide plate to move.

6. The conveniently adjustable chainsaw chain tensioning structure according to claim 1, characterized in that, The tensioning structure further includes a first fixing block, a second fixing block, and a cover plate. The first fixing block is rotatably connected to the end of the lead screw or threaded rod, the second fixing block is disposed on one side of the drive gear, and the cover plate is disposed on one side of the tensioning structure.

7. The conveniently adjustable chainsaw chain tensioning structure according to claim 1, characterized in that, A screw is provided on one side of the driven gear, and the tensioning pin is provided with an internal thread that mates with the screw.

8. The conveniently adjustable chainsaw chain tensioning structure according to claim 1, characterized in that, Both the driving gear and the driven gear are helical gears.

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