Eccentrically driven circular saw

Abstract

The present application relates to a kind of eccentric drive circular saw, drive motor is provided on the body and disc saw blade, disc saw blade is installed on the body, the fixed structure of disc saw blade is provided on the body, disc saw blade is installed on the disc saw blade of the execution cutting disc saw tooth disc, the support structure of disc saw blade is provided on the disc saw blade, disc saw tooth disc rotates relative to the installation site of disc saw blade on the body, drive motor is rotated by transmission structure and is driven disc saw tooth disc on disc saw blade, the power receiving position of disc saw blade and the rotation center of disc saw tooth disc are eccentrically arranged.The position adjusting structure of disc saw blade is also provided on the body.Oil lubrication structure is also provided, including oil can and the oil inlet hole of oil can and the oil inlet hole of disc saw blade are connected by oil line.The present application can realize the cutting depth of greater than the radius of saw blade, and the stress of saw tooth is more uniform than the stress of prior art in eccentric arrangement scheme, and eccentric vibration is not generated.

Description

Technical Field

[0001] This invention belongs to the field of power tools, and particularly relates to an eccentrically driven circular saw for cutting. Background Technology

[0002] This invention relates to cutting machines that use circular saw blades to perform cutting operations. Common examples include electric circular saws, table saws, stone cutting machines, concrete grooving machines, etc. Taking an electric circular saw as an example, an electric circular saw includes a drive mechanism and a circular saw blade driven to rotate by the drive mechanism. The electric circular saw utilizes the high-speed rotation of the circular saw blade to perform the cutting operation on the workpiece. When the thickness of the workpiece to be cut exceeds the maximum cutting depth of the electric circular saw, the user needs to replace it with an electric circular saw with a different maximum cutting depth, using a larger saw blade, and requiring greater input power. How to increase the cutting depth of the electric circular saw as much as possible without increasing the saw blade diameter and cutting power has become a problem that those skilled in the art want to overcome.

[0003] The current solution attempts to maximize the cutting depth by setting the rotation axis eccentrically and slightly upward relative to the central axis of the circular saw blade. The rotational power of the circular saw blade still originates from its central axis. However, this design still limits the cutting depth to the radius of the saw blade, only bringing it as close as possible to its central axis. While simultaneously eccentrically setting both the rotation axis and the saw blade's central hole results in a very small eccentricity (maximum 5mm), this eccentric rotation, as is well known, increases power consumption, especially during eccentric cutting, leading to greater wear. Although this method slightly increases the cutting depth, it significantly increases power consumption. While eccentrically setting the rotation axis relative to the central axis of the saw blade increases the cutting thickness somewhat, it still cannot exceed the radius of the saw blade, resulting in a very limited increase. Simultaneously eccentrically setting the drive shaft and saw blade, while increasing the cutting thickness, increases the stress on the local saw teeth, significantly increases energy consumption, and generates eccentric vibration, negatively impacting the operator's experience. Summary of the Invention

[0004] To address the above problems, the present invention provides an eccentrically driven circular saw that can achieve a cutting depth greater than the radius of the cutting saw blade.

[0005] This invention discloses an eccentrically driven circular saw, comprising a drive motor and a circular saw blade mounted on the machine body. The circular saw blade is mounted on the machine body, which has a fixing structure for the circular saw blade. A saw toothed disc for cutting is mounted on the circular saw blade, and a support structure for the saw toothed disc is provided on the circular saw blade. The saw toothed disc rotates relative to the mounting position of the circular saw blade on the machine body. The drive motor drives the saw toothed disc on the circular saw blade to rotate through a transmission structure. The power receiving position of the circular saw blade is eccentrically set with respect to the rotation center of the saw toothed disc.

[0006] The machine body is also equipped with a circular saw blade position adjustment structure.

[0007] The circular saw blade is equipped with an upper cover plate, a lower cover plate, and a fixed support plate for mounting the circular saw tooth disc. The upper and lower cover plates are located on both sides of the circular saw tooth disc. The circular saw tooth disc has a ring structure with cutting teeth on the outer side and an inner ring gear for transmission on the inner side. The fixed support plate is located inside the ring structure of the circular saw tooth disc. The upper and lower cover plates are connected to both sides of the fixed support plate. The fixed support plate has a slot to accommodate an auxiliary gear. The auxiliary gear is installed between the upper and lower cover plates and cooperates with the inner ring gear of the circular saw tooth disc to support the position of the circular saw tooth disc.

[0008] The fixed support plate is slightly thicker than the circular sawtooth plate, allowing it to rotate smoothly between the lower and upper cover plates.

[0009] The machine body is equipped with a saw blade mounting boss, on which a fixing bolt and a circular saw blade anti-sway positioning protrusion are provided. The fixing bolt passes through the circular saw blade and is tightened with a fixing nut. The circular saw blade is equipped with a circular saw blade anti-sway positioning groove, and the circular saw blade anti-sway positioning protrusion is inserted into the circular saw blade anti-sway positioning groove.

[0010] The saw blade mounting boss is equipped with a drive gear. The drive motor drives the drive gear to rotate through a reduction gearbox. The drive gear meshes with the inner ring teeth of the circular saw blade.

[0011] The saw blade mounting platform is equipped with fixing bolts and adjusting nuts. Below the adjusting nut is an adjusting screw. The adjusting nut corresponds to the oil inlet hole on one side of the circular saw blade. By adjusting the adjusting screw, the adjusting nut can be moved up and down. The adjusting nut is equipped with a support column that mates with the oil inlet hole. The height of the circular saw blade is adjusted by supporting the oil inlet hole through this support column, thereby adjusting the height of the circular saw blade and adjusting the engagement position between the saw tooth disk inside the circular saw blade and the drive gear.

[0012] It is also equipped with an oil lubrication structure, including an oil can and an oil inlet hole that connects the oil can to the circular saw blade via an oil passage.

[0013] The drive motor drives the fan to blow air into the air inlet. The air inlet is inserted into the air inlet and is connected to a one-way valve and then to an oil reservoir via a conduit. This allows air to flow into the oil reservoir, and the air pressure forces the oil in the reservoir into the oil outlet pipe, which reaches the oil outlet nozzle. The oil outlet nozzle is installed inside the machine housing at the oil outlet position. The oil then enters the circular saw blade through the oil inlet hole on the lower cover plate, providing lubrication to the lower cover plate, the circular saw tooth disc, the upper cover plate, the auxiliary gear positioning support, the auxiliary gear, and the cylindrical ball bearings.

[0014] Beneficial effects: This invention can achieve a cutting depth greater than the saw blade radius. The saw teeth are subjected to more uniform force than the eccentric setting scheme in the prior art, and no eccentric vibration is generated. At the same maximum cutting thickness, the contact area between the saw blade and the workpiece of this invention is relatively small, reducing energy consumption. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the eccentric drive circular saw principle of the present invention.

[0016] Figure 2 This is a schematic diagram of the eccentrically driven circular saw mounting structure of the present invention.

[0017] Figure 3 This is an exploded view of the circular saw blade of the present invention.

[0018] Figure 4 This is an exploded view of the eccentrically driven circular saw of the present invention.

[0019] Figure 5 This is a schematic diagram of the overall eccentrically driven circular saw of the present invention.

[0020] The attached diagram is labeled as follows: 1. Machine body; 2. Saw blade mounting boss; 3. Drive motor; 4. Anti-sway positioning boss for circular saw blade; 5. Drive gear; 6. Reduction gearbox; 7. Oil reservoir; 8. Circular saw blade; 9. Protective cover; 10. Adjusting nut; 11. Adjusting screw; 12. Lower cover plate; 13. Fixed support plate; 14. Circular saw blade toothed disc; 15. Upper cover plate; 16. Auxiliary gear positioning support column; 17. Auxiliary gear; 18. Cylindrical ball bearing; 19. Oil inlet; 20. Oil outlet; 21. Fixing bolt; 22. Fixing nut; 24. Front handle; 25. Rear handle; 26. Auxiliary gear positioning support hole; 27. Lower cover plate center positioning hole; 28. Circular saw blade anti-sway positioning groove; 29. ​​Fixed support plate center positioning hole; 30. Upper cover plate center positioning hole; 31. Fixed support plate oil guide groove; 32. Air inlet; 33. Air inlet; 34. One-way valve; 35. Oil outlet pipe; 36. Oil outlet nozzle. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific implementation examples.

[0022] This invention discloses an eccentrically driven circular saw. The machine body 1 has a saw blade mounting boss 2, on which a fixing bolt 21 and an adjusting nut 10 are mounted. An adjusting screw 11 is located below the adjusting nut 10. The adjusting nut 10 corresponds to an oil inlet hole 19 on one side of the circular saw blade 8. By adjusting the adjusting screw 11, the adjusting nut 10 can be moved up and down. The adjusting nut 10 has a support column that mates with the oil inlet hole 19. This support column supports the oil inlet hole 19, adjusting the height of the circular saw blade 8. This adjustment of the height of the circular saw blade 8 allows for adjustment of the mating position between the internal saw tooth disk 14 and the drive gear 5.

[0023] The oil inlet hole 19 on the other side of the circular saw blade 8 is used to insert the oil outlet 36. The other end of the oil outlet 36 is installed on the oil outlet 20 of the saw blade mounting boss 2. The circular saw blade 8 is provided with two symmetrical oil inlet holes 19, so that the circular saw blade 8 can be installed on both sides without distinguishing between the front and back sides, making it convenient to use.

[0024] The saw blade mounting boss 2 is equipped with a drive gear 5, a circular saw blade anti-sway positioning boss 4, a fixing bolt 21, and an adjusting nut 10.

[0025] The anti-sway positioning protrusion 4 of the circular saw blade is inserted into the anti-sway positioning groove 28 of the circular saw blade. The circular saw blade is limited by the cooperation between the two sides of the anti-sway positioning protrusion 4 and the anti-sway positioning groove 28 of the circular saw blade.

[0026] In this embodiment, the insertion positions of the drive gear 5 and the fixing bolt 21 are set in the same groove as the anti-sway positioning groove 28 of the circular saw blade. The drive gear 5 is inserted into the upper end of the groove, and the drive gear 5 engages with the inner ring teeth of the circular saw blade 14 to achieve transmission. The fixing bolt 21, which passes through the circular saw blade 8, is inserted into the lower end of the groove. The integrated groove design facilitates processing and reduces the space occupied by the above functions on the circular saw blade 8.

[0027] The saw blade mounting boss 2 on the machine body 1 can be used to install the circular saw blade 8 by passing the fixing bolt 21 through the circular saw blade 8 and the protective cover 9 and then tightening the fixing nut 22. Alternatively, the fixing bolt 21 can be passed through the circular saw blade 8 and the fixing nut 22 can be tightened, and the protective cover can be installed separately by other means. The fixing bolt 21 does not coincide with the center of the circular saw blade 8, and it is located in the upper half of the circular saw blade 8 to achieve an eccentric effect.

[0028] After installation, the drive gear 5 drives the inner ring gear of the drive disc saw 14 to rotate, and the drive disc saw 14 performs cutting operations through the outer ring saw teeth.

[0029] The drive motor 3 drives the fan to blow air into the air outlet 32. The air inlet 33 is inserted into the air outlet 32. The air inlet 33 is connected to the one-way valve 34 through the conduit and then to the oil can 7, so that the airflow enters the oil can. The air pressure forces the oil in the oil can 7 into the oil outlet pipe 35 and reaches the oil outlet 36. The oil outlet 36 is installed at the oil outlet 20 inside the machine housing. The oil then enters the circular saw blade 8 through the oil inlet hole 19 on the lower cover plate 12, providing lubrication to the lower cover plate 12, the circular saw blade 14, the upper cover plate 15, the auxiliary gear positioning support 16, the auxiliary gear 17, and the cylindrical ball bearing 18.

[0030] The circular saw blade 8 is first riveted to the center of the fixed support plate 13 by spot welding from the center of the lower cover plate 12. The auxiliary gear positioning support column 16 is riveted to the lower cover plate 12. The circular saw tooth plate 14 is fitted onto the above-mentioned riveting assembly. The fixed support plate 13 is slightly thicker than the circular saw tooth plate 14 so that it can rotate smoothly between the lower cover plate 12 and the upper cover plate 15. Then, the cylindrical ball bearing 18 is placed around the auxiliary gear positioning support column 16 and the auxiliary gear 17 is fitted around its outer ring. Then, the upper cover plate 15 is placed on the fixed support plate 13 by spot welding and riveting from the center. The upper cover plate 15 is riveted to the auxiliary gear positioning support column 16.

[0031] Driven by the drive motor 3, the drive gear 5 through the reduction gearbox 6 drives the inner ring gear of the disc saw tooth disk 14 to rotate under the support of the auxiliary gear positioning support 16, the auxiliary gear 17, and the cylindrical ball 18, so that the outer ring saw teeth of the disc saw tooth disk 14 can perform cutting operations.

[0032] When the circular saw blade 8 is installed on the machine body 1, the adjusting screw 11 drives the adjusting nut 10 to adjust the meshing clearance between the internal gear of the circular saw blade 14 and the drive gear 5, and then the fixing bolt 21 and fixing nut 22 are used to lock the screw.

[0033] The breakdown structure of the circular saw blade 8 is as follows:

[0034] The lower cover plate 12 is provided with an oil inlet hole 19, a circular saw blade anti-sway positioning groove 28, an auxiliary gear positioning support hole 26, and a lower cover plate center positioning hole 27.

[0035] The fixed support plate 13 is provided with a fixed support plate center positioning hole 29, a fixed support plate oil guide groove 31, a slot to accommodate the auxiliary gear 17, and a slot corresponding to the circular saw blade anti-sway positioning groove 28.

[0036] The upper cover plate 15 is provided with an oil inlet hole 19, a circular saw blade anti-sway positioning groove 28, an auxiliary gear positioning support hole 26, and an upper cover plate center positioning hole 30; the lower cover plate 12 has the same shape as the upper cover plate 15.

[0037] The circular sawtooth disk 14 is annular, and the internal teeth of the annular disk mesh with the auxiliary gear 17. The inner ring of the auxiliary gear 17 is mounted on the cylindrical ball bearing 18, which is mounted around the auxiliary gear positioning support 16. The auxiliary gear positioning support 16 is located in the auxiliary gear positioning support hole 26, which is located on the lower cover plate 12 and the upper cover plate 15. In this embodiment, three sets of auxiliary gears 17 are arranged inside the annular disk 14.

[0038] In this invention, the center of the drive shaft is eccentrically positioned relative to the center of the circular saw blade. The circular saw blade has a structure with serrated outer rings and gear-like inner rings. Multiple sets of auxiliary gears are arranged along the center of the circular saw blade. These auxiliary gears rotate around their own axes to assist in the motion. Multiple sets of rollers are installed inside the blade, and the inner ring experiences rolling friction during rotation.

[0039] The chassis, fixed support plate, and cover plate can be fixed together by spot welding and riveting, thereby fixing the relative position of the auxiliary gear shaft. At the same time, the gap between the circular saw blade and the chassis and cover plate is set.

[0040] The fixed support plate is equipped with oil holes and oil path tracks. During the rotation of the saw blade, the oil can flow along the running path to increase the life of the saw blade. The base fixed support plate cover is fixed to the machine as a whole. The fixed position is slightly above the center axis of the saw blade. This fixed position determines the maximum depth position, which can be designed to exceed the radius of the circular saw blade according to different load specifications.

[0041] The motion logic of this invention is as follows: the driving device drives the driving shaft to rotate, the driving teeth drive the driven teeth inside the saw blade to move, and the auxiliary gear supports the rotation, thereby driving the circular saw blade to rotate.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention 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; and 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 the present invention.

Claims

1. An eccentrically driven circular saw, comprising a drive motor and a circular saw blade mounted on a machine body, the circular saw blade being mounted on the machine body, and a fixing structure for the circular saw blade being provided on the machine body, characterized in that... The circular saw blade is equipped with a saw toothed disc for cutting. A support structure for the saw toothed disc is provided on the circular saw blade. The saw toothed disc rotates relative to its mounting position on the machine body. A drive motor drives the saw toothed disc on the circular saw blade to rotate via a transmission structure. The power receiving position of the circular saw blade is eccentrically positioned relative to the rotation center of the saw toothed disc. The circular saw blade has an upper cover plate, a lower cover plate, and a fixed support plate for mounting the saw toothed disc. The upper and lower cover plates are located on both sides of the saw toothed disc. The saw toothed disc has a ring structure. The internal teeth of the ring mesh with an auxiliary gear. Cutting teeth are located on the outer side of the ring, and an inner ring gear for transmission is located on the inner side of the ring structure. The fixed support plate is located within the ring structure of the saw toothed disc. The upper and lower cover plates are connected to both sides of the fixed support plate. The fixed support plate has slots to accommodate the auxiliary gear, which is installed between the upper and lower cover plates and meshes with the inner ring gear of the saw toothed disc to support its position.

2. The eccentrically driven circular saw according to claim 1, characterized in that... The fixed support plate is slightly thicker than the circular sawtooth plate to allow it to rotate smoothly between the lower and upper cover plates.

3. The eccentrically driven circular saw according to claim 1, characterized in that... The machine body is equipped with a saw blade mounting boss. The fixed structure of the circular saw blade is that the saw blade mounting boss is equipped with a fixing bolt and a circular saw blade anti-sway positioning protrusion. The fixing bolt passes through the circular saw blade and is tightened with a fixing nut. The circular saw blade is equipped with a circular saw blade anti-sway positioning groove, and the circular saw blade anti-sway positioning protrusion is inserted into the circular saw blade anti-sway positioning groove.

4. The eccentrically driven circular saw according to claim 3, characterized in that... The saw blade mounting boss is equipped with a drive gear. The drive motor drives the drive gear to rotate through a reduction gearbox. The drive gear meshes with the inner ring teeth of the circular saw blade.

5. The eccentrically driven circular saw according to any one of claims 1-4, characterized in that... The machine body is also equipped with a circular saw blade position adjustment structure.

6. The eccentrically driven circular saw according to claim 4, characterized in that... The saw blade mounting platform is equipped with fixing bolts and adjusting nuts. Below the adjusting nut is an adjusting screw. The adjusting nut corresponds to the oil inlet hole on one side of the circular saw blade. By adjusting the adjusting screw, the adjusting nut can be moved up and down. The adjusting nut is equipped with a support column that cooperates with the oil inlet hole. The height of the circular saw blade is adjusted by supporting the oil inlet hole, thereby adjusting the height of the circular saw blade and adjusting the engagement position between the saw tooth disk inside the circular saw blade and the drive gear.

7. The eccentrically driven circular saw according to any one of claims 1-4, characterized in that... It also features an oil lubrication system, including an oil reservoir connected to the oil inlet of the circular saw blade via an oil passage.

8. The eccentrically driven circular saw according to claim 7, characterized in that... The drive motor blows air through the fan to the air inlet. The air inlet is inserted into the air inlet and connected to a one-way valve and then to an oil reservoir via a conduit. This allows air to flow into the oil reservoir, and the air pressure forces the oil in the reservoir into the oil outlet pipe, which reaches the oil outlet. The oil outlet is installed inside the machine housing at the oil outlet position. The oil then enters the circular saw blade through the oil inlet hole on the lower cover plate, providing lubrication to the lower cover plate, the circular saw tooth disc, the upper cover plate, the auxiliary gear positioning support, the auxiliary gear, and the cylindrical ball bearings.

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