Chain saw tensioning mechanism
By employing a rolling connection between the limit block and the locking element in the chainsaw tensioning mechanism, the problem of scraping between the limit baffle and the tensioning support block is solved, thereby reducing abnormal noise and wear and improving the service life of the chainsaw.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-04-03
AI Technical Summary
In existing chainsaw tensioning mechanisms, the limit baffle and tensioning support block are prone to scraping when they rotate, resulting in abnormal noise and wear.
The use of rolling connection limit blocks instead of direct contact limit blocks and tension support blocks, combined with locking components and soft pad design, reduces wear and abnormal noise.
This effectively prevents the limit block from rubbing against the tensioning support block, reduces abnormal noise and wear, and ensures the stability and durability of the tensioning mechanism.
Smart Images
Figure CN224073467U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chainsaw tensioning technology, and in particular to a chainsaw tensioning mechanism. Background Technology
[0002] When tensioning a chainsaw, the chain is typically tensioned by adjusting the position of the chainsaw guide plate. Existing tensioning mechanisms generally include a tensioning support block housed within the chainsaw housing, and a tensioning plate that can be adjusted relative to the tensioning support block. A tensioning rod connected to the chainsaw guide plate is mounted on the tensioning plate. The tensioning support block has a slot with gears, one of which is located within the slot. External force rotates the other gear, which meshes with the gear in the slot, rotating a screw to adjust the tensioning plate and thus the position of the chainsaw guide plate. To prevent the gear in the slot from scraping against the sidewall of the slot due to the reaction force generated during tensioning, existing technology includes a limiting baffle. However, when the limiting baffle rotates and comes into contact with the tensioning support block, it easily scrapes against the block, causing abnormal noise and significant wear. Utility Model Content
[0003] To address the aforementioned problems, this utility model provides a chainsaw tensioning mechanism that, based on the setting of a limiting block, utilizes a rolling connection to avoid scratching, reduce abnormal noise and wear.
[0004] The technical solution of this utility model is as follows:
[0005] A chainsaw tensioning mechanism, comprising:
[0006] The tensioning support block has a gear groove on its bottom side and a limit groove on one side wall.
[0007] The tensioning plate is L-shaped and includes a connecting plate and an adjusting plate arranged perpendicularly to each other. The connecting plate is located on the top side of the tensioning support block, and a tensioning rod is provided on the side of the connecting plate facing away from the tensioning support block. The adjusting plate is located on the side where the limiting groove of the tensioning support block is located, and a screw hole is provided on the adjusting plate.
[0008] The adjustment structure includes a rotating shaft, an adjusting screw, a first bevel gear, a second bevel gear, and an adjusting shaft. One end of the rotating shaft is rotatably connected to the side of the gear groove away from the limiting groove, and the other end extends through the gear groove to the limiting groove. The first bevel gear is sleeved on the outside of the rotating shaft inside the gear groove, and the width of the gear groove is greater than the thickness of the first bevel gear. A limiting block is sleeved on the outside of the rotating shaft in the limiting groove, and a rolling element that rolls to connect with the limiting groove is provided on the side of the limiting block near the gear groove. The adjusting screw is located at the end of the rotating shaft and is connected to an adjusting plate through a screw hole. The second bevel gear is rotatably mounted on a tensioning support block through the adjusting shaft, and the second bevel gear meshes with the first bevel gear.
[0009] In a further technical solution, the limiting block is provided with a mounting groove on the side near the gear groove, and the rolling element includes a retainer disposed in the mounting groove and balls disposed on the retainer.
[0010] In a further technical solution, the end of the adjusting shaft is provided with a rotating handle.
[0011] In a further technical solution, a locking element is provided between the rotating handle and the tensioning support block.
[0012] In a further technical solution, the bottom of the rotating handle is provided with a movable sleeve fitted onto the end of the adjusting shaft, the end of the adjusting shaft is provided with a slot, and the inner side of the movable sleeve is provided with a matching slot insert; the locking component includes a locking ring and a locking block, the locking ring is located on the side of the tensioning support block near the rotating handle and is fitted onto the outside of the adjusting shaft, the locking block is located on the outside of the movable sleeve, and the inner side of the locking ring has a ring array of multiple locking grooves matching the locking blocks.
[0013] In a further technical solution, the adjusting plate is provided with a soft pad on the side near the tensioning support block.
[0014] The beneficial effects of this utility model are:
[0015] 1. By setting a rolling element on the side of the limit block near the gear groove, the rolling element rolls and connects to the tension support block instead of the limit block directly abutting against the tension support block, thus avoiding scraping when the limit block rotates relative to the tension support block and reducing abnormal noise and wear.
[0016] 2. The handle at the end of the adjusting shaft allows for easy and convenient rotation of the second bevel gear. After rotating the handle, a locking mechanism can be used to lock the handle relative to the tensioning support block, preventing loosening after tensioning.
[0017] 3. The soft pads on the adjustment plate can prevent the adjustment plate from getting too close to the tension support block and causing scratches and wear. Attached Figure Description
[0018] Figure 1 This is a front cross-sectional schematic diagram of a chainsaw tensioning mechanism according to an embodiment of the present utility model;
[0019] Figure 2 This is a top view schematic diagram of a chainsaw tensioning mechanism according to an embodiment of the present utility model;
[0020] Figure 3 This is a schematic diagram of the end of the adjusting shaft described in this embodiment of the utility model;
[0021] Figure 4 This is a schematic diagram of the structure of the rotating handle described in an embodiment of this utility model;
[0022] Figure 5This is a schematic diagram of the locking ring described in an embodiment of the present invention.
[0023] Explanation of reference numerals in the attached figures:
[0024] 10. Tensioning support block; 11. Locking ring; 12. Locking groove; 21. Connecting plate; 22. Adjusting plate; 23. Tensioning rod; 24. Soft pad; 31. Rotating shaft; 32. Adjusting screw; 33. First bevel gear; 34. Second bevel gear; 35. Adjusting shaft; 36. Limiting block; 37. Ball bearing; 38. Slot; 40. Rotating handle; 41. Movable sleeve; 42. Insert block; 43. Locking block. Detailed Implementation
[0025] The embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0026] Example:
[0027] like Figures 1-2 As shown, a chainsaw tensioning mechanism includes a tensioning support block 10, a tensioning plate, and an adjusting structure. The tensioning support block 10 has a gear groove on its bottom side and a limiting groove on one side wall. The tensioning plate is L-shaped and includes a connecting plate 21 and an adjusting plate 22 arranged perpendicularly to each other. The connecting plate 21 is located on the top side of the tensioning support block 10, and a tensioning rod 23 is located on the side of the connecting plate 21 facing away from the tensioning support block 10. The adjusting plate 22 is located on the side where the limiting groove of the tensioning support block 10 is located, and a screw hole is provided on the adjusting plate 22. The adjusting structure includes a rotating shaft 31, an adjusting screw 32, a first bevel gear 33, a second bevel gear 34, and an adjusting shaft 35. One end of the rotating shaft 31 is rotatably connected to the side of the gear groove away from the limiting groove via a bearing. A space is provided between the gear groove and the limiting groove for the rotating shaft 31 to pass through. The other end of the rotating shaft 31 extends through the through hole to the limiting groove; the first bevel gear 33 is sleeved on the outside of the rotating shaft 31 in the gear groove, and the width of the gear groove is greater than the thickness of the first bevel gear 33, so that there is a clearance for movement on both sides of the first bevel gear 33; a limiting block 36 is sleeved on the outside of the rotating shaft 31 in the limiting groove, and a mounting groove is provided on the side of the limiting block 36 near the gear groove. A rolling element is provided in the mounting groove, including a retainer in the mounting groove and a ball 37 on the retainer. The ball 37 is tactilely connected to the limiting groove; an adjusting screw 32 is provided at the end of the rotating shaft 31 and is connected to the adjusting plate 22 through a screw hole; the second bevel gear 34 is rotatably mounted on the tensioning support block 10 through the adjusting shaft 35, and the second bevel gear 34 meshes with the first bevel gear 33.
[0028] The working principle of the above technical solution is as follows:
[0029] The tensioning mechanism is housed within the chainsaw's casing. The tensioning support block 10 is fixedly connected to the casing, and the adjusting screw 32 is rotatably connected to the casing. The end of the adjusting shaft 35 extends to the outside of the casing. One end of the existing chainsaw guide plate is fitted onto the tensioning rod 23 through a tensioning hole. The casing limits the movement of both sides of the connecting plate 21, allowing the tensioning plate to move only along the axial direction of the adjusting screw 32. Furthermore, the adjusting shaft 35, located outside the casing, can be rotated, causing the second bevel gear 34 to mesh with the first bevel gear 33, thus facilitating the rotation of the shaft 31 and the adjusting screw 32. When the adjusting screw 32 rotates, it drives the tensioning plate to move along the axial direction of the adjusting screw 32, thereby moving the tensioning rod 23. When tensioning, the chainsaw guide plate will generate a reaction force that makes the rotating shaft 31 have a reaction force along the adjusting plate 22 toward the tensioning support block 10. At this time, the supporting and limiting function of the limiting block 36 and the ball 37 prevents the first bevel gear 33 from contacting the gear groove and causing scraping. The limiting block 36 can continue to rotate relative to the limiting groove through the ball 37, which prevents the limiting block 36 from scraping relative to the tensioning support block 10 when rotating, reducing abnormal noise and wear.
[0030] In another embodiment, such as Figure 2-5 As shown, to facilitate the rotation of the adjusting shaft 35, a handle 40 can be provided at the end of the adjusting shaft 35, and a locking element is provided between the handle 40 and the tensioning support block 10. Specifically, the bottom of the handle 40 is provided with a movable sleeve 41 sleeved on the end of the adjusting shaft 35, the end of the adjusting shaft 35 is provided with a slot 38, and the inner side of the movable sleeve 41 is provided with a matching insert 42 of the slot 38. The insert 42 is inserted into the slot 38 to prevent the handle 40 from rotating relative to the adjusting shaft 35. The locking element includes a locking ring 11 and a locking block 43. The locking ring 11 is located on the side of the tensioning support block 10 near the handle 40 and is sleeved on the outside of the adjusting shaft 35. The locking block 43 includes two blocks, located on opposite sides of the outer side of the movable sleeve 41. The inner side of the locking ring 11 has a ring array of multiple locking grooves 12 matching the locking blocks 43.
[0031] After the adjusting shaft 35 is rotated by the handle 40, the movable sleeve 41 can be axially extended and retracted relative to the adjusting shaft 35, so that the locking block 43 on the outside of the movable sleeve 41 can be inserted into the corresponding locking groove 12, thereby locking the handle 40 and the adjusting shaft 35 and preventing loosening after tensioning.
[0032] In another embodiment, such as Figure 1 As shown, the adjusting plate 22 has a soft pad 24 on the side near the tensioning support block 10.
[0033] The pad 24 on the adjusting plate 22 can prevent the adjusting plate 22 from getting too close to the tension support block 10 and causing scratches and wear.
[0034] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.
Claims
1. A chainsaw tensioning mechanism, characterized in that, include: The tensioning support block has a gear groove on its bottom side and a limit groove on one side wall. The tensioning plate is L-shaped and includes a connecting plate and an adjusting plate arranged perpendicularly to each other. The connecting plate is located on the top side of the tensioning support block, and a tensioning rod is provided on the side of the connecting plate facing away from the tensioning support block. The adjusting plate is located on the side where the limiting groove of the tensioning support block is located, and a screw hole is provided on the adjusting plate. The adjustment structure includes a rotating shaft, an adjusting screw, a first bevel gear, a second bevel gear, and an adjusting shaft. One end of the rotating shaft is rotatably connected to the side of the gear groove away from the limiting groove, and the other end extends through the gear groove to the limiting groove. The first bevel gear is sleeved on the outside of the rotating shaft inside the gear groove, and the width of the gear groove is greater than the thickness of the first bevel gear. A limiting block is sleeved on the outside of the rotating shaft in the limiting groove, and a rolling element that rolls to connect with the limiting groove is provided on the side of the limiting block near the gear groove. The adjusting screw is located at the end of the rotating shaft and is connected to an adjusting plate through a screw hole. The second bevel gear is rotatably mounted on a tensioning support block through the adjusting shaft, and the second bevel gear meshes with the first bevel gear.
2. The chainsaw tensioning mechanism according to claim 1, characterized in that, The limiting block has an installation groove on the side near the gear groove, and the rolling element includes a retainer disposed in the installation groove and balls disposed on the retainer.
3. A chainsaw tensioning mechanism according to claim 1, characterized in that, The adjusting shaft has a rotating handle at its end.
4. A chainsaw tensioning mechanism according to claim 3, characterized in that, A locking element is provided between the rotating handle and the tensioning support block.
5. A chainsaw tensioning mechanism according to claim 4, characterized in that, The bottom of the rotating handle is provided with a movable sleeve fitted onto the end of the adjusting shaft. The end of the adjusting shaft is provided with a slot. The inner side of the movable sleeve is provided with a matching slot insert. The locking component includes a locking ring and a locking block. The locking ring is located on the side of the tensioning support block near the rotating handle and is fitted onto the outside of the adjusting shaft. The locking block is located on the outside of the movable sleeve. The inner side of the locking ring has a ring array of multiple locking grooves that match the locking blocks.
6. A chainsaw tensioning mechanism according to claim 1, characterized in that, The adjusting plate has a soft pad on the side near the tensioning support block.