An electric circular saw

Abstract

The utility model discloses a kind of electric circular saws, it is related to the technical field of cutting tool, it includes handle casing, driving motor and saw blade, the handle casing includes first half shell, second half shell and machine shell, the first half shell is fixedly connected to the second half shell, the machine shell is fixedly arranged in the first half shell and the second half shell, the machine shell is provided with the installation cavity of opening towards the first half shell;The driving motor includes stator assembly and rotor assembly, the stator assembly is fixedly arranged in the installation cavity, the rotor assembly is rotatably cooperated with the stator assembly;The stator assembly and the rotor assembly axial limit between the first half shell and the second half shell, the rotating shaft of the rotor assembly extends the first half shell and the saw blade transmission connection.The utility model reduces the number of parts, reduces processing cost and step, compact structure, layout is reasonable.

Description

Technical Field

[0001] This utility model relates to the technical field of cutting tools, and in particular to an electric circular saw. Background Technology

[0002] An electric circular saw is a cutting tool used for cutting operations. It includes a handle housing, a drive motor, and a saw blade. The drive motor is located in the handle housing, and the saw blade is located outside the handle housing and connected to the drive motor's shaft.

[0003] In related technologies, the drive motor includes a stator assembly, a rotor assembly, a cylinder, a front cover, and a rear cover. The stator assembly is housed within the cylinder, and the rotor assembly is rotatably fitted within the stator assembly. The front and rear covers cover the front and rear sides of the machine housing. After assembly, the drive motor is installed in the handle housing and connected to the saw blade.

[0004] In the aforementioned technologies, the drive motor requires front and rear end covers, which involves a large number of parts, increasing production costs and processing steps. The drive motor also occupies a large space, resulting in a large overall size of the electric circular saw. Utility Model Content

[0005] The purpose of this utility model is to provide an electric circular saw that reduces the number of parts, lowers processing costs and steps, and has a compact structure and reasonable layout.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: This utility model provides an electric circular saw, which includes a handle housing, a drive motor, and a saw blade. The handle housing includes a first half-shell, a second half-shell, and a machine housing. The first half-shell is fixedly connected to the second half-shell, and the machine housing is fixedly disposed within the first and second half-shells. The machine housing has a mounting cavity with an opening facing the first half-shell. The drive motor includes a stator assembly and a rotor assembly. The stator assembly is fixedly disposed within the mounting cavity, and the rotor assembly is rotatably fitted through and engaged with the stator assembly. The stator assembly and the rotor assembly are axially limited between the first and second half-shells, and the shaft of the rotor assembly extends out of the first half-shell and is drively connected to the saw blade.

[0007] Furthermore, the first half-shell has an output window, and a mounting bracket is detachably connected to the first half-shell. The mounting bracket blocks the output window and has an output hole. The shaft of the rotor assembly extends out of the output hole.

[0008] Furthermore, the first half-shell has a first connecting hole, and the mounting bracket has a second connecting hole aligned with the first connecting hole. The first connecting hole and the second connecting hole are both passed through a connecting bolt to connect the mounting bracket and the first half-shell.

[0009] Furthermore, the mounting bracket has a limiting groove on one side facing the second half-shell, and the output hole communicates with the limiting groove; the rotor assembly's shaft is coaxially connected to a first bearing, which is rotatably fitted into the limiting groove.

[0010] Furthermore, a shock-absorbing washer is connected to the end of the rotor assembly's shaft away from the mounting bracket, and the shock-absorbing washer abuts against the bottom wall of the housing.

[0011] Furthermore, a second bearing is fitted inside the inner ring of the damping washer, and the inner ring of the second bearing is fitted outside the shaft of the rotor assembly.

[0012] Furthermore, a wind baffle is detachably connected to the opening of the housing, and the side of the stator assembly facing the opening of the mounting cavity abuts against the wind baffle; a limiting step is provided on the inner wall of the housing, and the side of the stator assembly facing the bottom wall of the mounting cavity abuts against the limiting step.

[0013] Furthermore, the handle housing also includes a head shell, which is detachably connected to the side of the first half-shell opposite to the second half-shell, and the head shell covers the saw blade.

[0014] Furthermore, the head shell has a threaded hole, which communicates with the first connecting hole and the second connecting hole. The connecting bolt passes through the first connecting hole and the second connecting hole and then engages with the threaded hole.

[0015] Furthermore, a clearance opening is provided on the side of the second half-shell opposite to the first half-shell, and the end of the housing opposite to the first half-shell extends out of the clearance opening.

[0016] In summary, this utility model has the following beneficial effects: 1. In this utility model of an electric circular saw, the drive motor is installed inside the handle housing. Specifically, the stator assembly and rotor assembly of the drive motor are installed inside the housing and axially confined between the first half-shell and the second half-shell. The rotor assembly's shaft extends out of the first half-shell and is connected to the saw blade for transmission, thereby driving the saw blade to rotate for cutting. Thus, this electric circular saw directly installs the stator assembly and rotor assembly of the drive motor through the handle housing, eliminating the need for additional end caps, reducing the number of parts, lowering production costs, and reducing assembly complexity. This arrangement fully utilizes the space within the handle housing, reducing the overall size of the electric circular saw.

[0017] 2. The first half-shell has a mounting bracket at the output window, which can be used to install the gear set and saw blade; during maintenance, the mounting bracket can be removed from the output window to facilitate the inspection and maintenance of the stator assembly and rotor assembly.

[0018] 3. The rotor assembly's shaft is connected to the first bearing. The first bearing engages with the limiting groove of the mounting bracket to limit the rotor assembly axially and radially, making it difficult for the rotor assembly to move axially or wobble radially.

[0019] 4. A damping washer is installed at the end of the rotor assembly shaft away from the mounting bracket to reduce vibration when the rotor assembly rotates; a second bearing is installed between the shaft and the damping washer, so that both ends of the shaft are supported by bearings, making the shaft more stable and reducing wear when rotating.

[0020] 5. The opposite sides of the stator assembly abut against the wind baffle and the limiting step, respectively, to axially limit the stator assembly within the housing.

[0021] 6. The first connecting hole, the second connecting hole, and the threaded hole are aligned. After the connecting bolt passes through the first connecting hole and the second connecting hole, it engages with the threaded hole to realize the detachable connection of the first half shell, the mounting bracket, and the head shell. The connection is reliable and convenient, and the disassembly and assembly are easy. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of an electric circular saw according to an embodiment of the present invention.

[0023] Figure 2 This is an exploded structural diagram of an electric circular saw according to an embodiment of the present invention.

[0024] Figure 3 This is a three-dimensional structural diagram of the casing according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the vertical cross-sectional structure of an electric circular saw according to an embodiment of this utility model.

[0026] Figure 5 yes Figure 4 Enlarged structural diagram at point A in the middle.

[0027] Figure 6 This is a three-dimensional structural diagram of the mounting bracket according to an embodiment of the present invention.

[0028] In the picture: 1000, Circular saw; 100, Handle housing; 110, First half-shell; 111, First connecting hole; 112, Output window; 120, Second half-shell; 121, Clearance opening; 130, Housing; 131, Mounting cavity; 132, Third connecting hole; 133, Limiting groove; 134, Limiting step; 140, Mounting bracket; 141, Output hole; 142, Second connecting hole; 143, Limiting circular groove; 150, Head housing; 151, Threaded hole; 160, Wind deflector; 170, Connecting bolt; 200, Drive motor; 210, Stator assembly; 220, Rotor assembly; 221, Shaft; 222, First bearing; 223, Vibration damping washer; 224, Second bearing. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] This embodiment discloses an electric circular saw 1000, referencing... Figure 1 and Figure 2 The electric circular saw 1000 includes a handle housing 100, a drive motor 200, and a saw blade (not shown in the figure). The drive motor 200 is disposed inside the handle housing 100, and the saw blade is rotatably disposed outside the handle housing 100 and is connected to the drive motor 200 for transmission.

[0031] Reference Figure 1 and Figure 2 In this embodiment, the handle housing 100 includes a first half-shell 110, a second half-shell 120, and a housing 130. The first half-shell 110 is fixedly connected to the second half-shell 120, and the first half-shell 110 and the second half-shell 120 are detachably connected. The first half-shell 110 and the second half-shell 120 enclose an internal cavity, and the housing 130 is fixedly disposed within the internal cavity of the first half-shell 110 and the second half-shell 120.

[0032] In this embodiment, the first half-shell 110 and the second half-shell 120 are connected by bolts. In other embodiments, the first half-shell 110 and the second half-shell 120 can also be connected by snap-fit ​​or other suitable means.

[0033] Reference Figure 2 and Figure 3 In this embodiment, the housing 130 is fixedly connected to the first half-shell 110. The housing 130 is a cylindrical component with a bottom at one end, and the housing 130 is provided with a mounting cavity 131 with an opening facing the first half-shell 110. The drive motor 200 is installed inside the housing 130.

[0034] In this embodiment, the housing 130 and the first half-shell 110 are connected by bolts. Specifically, refer to... Figures 3 to 5The first half-shell 110 has a first connecting hole 111, and the end of the housing 130 facing the first half-shell 110 has a third connecting hole 132. The first connecting hole 111 and the third connecting hole 132 are aligned and a connecting bolt 170 is passed through them simultaneously to detachably connect the housing 130 and the first half-shell 110. In other embodiments, the housing 130 and the first half-shell 110 can also be detachably or non-detachably fixedly connected by other suitable methods. In other embodiments, the housing 130 can also be fixedly connected to the second half-shell 120.

[0035] Reference Figure 2 The second half-shell 120 has a clearance opening 121 on the side opposite to the first half-shell 110. The end of the housing 130 opposite to the first half-shell 110 extends out of the clearance opening 121. This allows for a reduction in the size and material consumption of the second half-shell 120 while still satisfying the installation requirements of the drive motor 200.

[0036] In this embodiment, the clearance opening 121 fits into the housing 130, that is, the shape and size of the clearance opening 121 are the same as those of the housing 130, and the housing 130 is embedded in the clearance opening 121, so that the second half-shell 120 and the housing 130 are assembled tightly and reliably.

[0037] Reference Figure 2 The drive motor 200 includes a stator assembly 210 and a rotor assembly 220. The stator assembly 210 is fixedly disposed in the mounting cavity 131, and the stator assembly 210 is annular and adapted to the mounting cavity 131.

[0038] Reference Figure 2 and Figure 4 The rotor assembly 220 is rotatably fitted into the stator assembly 210. The stator assembly 210 and the rotor assembly 220 are axially confined between the first half-shell 110 and the second half-shell 120. The rotating shaft 221 of the rotor assembly 220 extends out of the first half-shell 110 and is connected to the saw blade drive to drive the saw blade to rotate for cutting. Thus, the electric circular saw 1000 directly mounts the stator assembly 210 and the rotor assembly 220 of the drive motor 200 through the handle housing 100, without the need for additional end caps, reducing the number of parts, lowering production costs and assembly complexity; this arrangement makes full use of the space inside the handle housing 100, reducing the overall size of the electric circular saw 1000.

[0039] Reference Figure 2 and Figure 4The first half-shell 110 has an output window 112, and a mounting bracket 140 is detachably connected to the first half-shell 110 at the output window 112, the mounting bracket 140 covering the output window 112. The mounting bracket 140 is for mounting gear sets and saw blades, and has an output hole 141, through which the shaft 221 of the rotor assembly 220 extends to connect to the gear set or saw blade. During maintenance, the mounting bracket 140 can be removed from the output window 112 to facilitate inspection and maintenance of the stator assembly 210 and the rotor assembly 220.

[0040] Reference Figure 4 and Figure 5 In this embodiment, the mounting bracket 140 has a second connecting hole 142 aligned with the first connecting hole 111. The connecting bolt 170 passes through both the first connecting hole 111 and the second connecting hole 142 to connect the mounting bracket 140 and the first half-shell 110. Thus, the first half-shell 110, the mounting bracket 140, and the housing 130 can be connected simultaneously by the connecting bolt 170, reducing the number of connecting parts and facilitating the assembly of the electric circular saw 1000.

[0041] In other embodiments, the mounting bracket 140 and the first half-shell 110 may be connected by other bolts instead of sharing the connecting bolt 170 with the housing 130. In other embodiments, the mounting bracket 140 and the first half-shell 110 may also be connected by other suitable methods.

[0042] Reference Figures 1 to 5 The handle housing 100 also includes a head housing 150. The head housing 150 is detachably connected to the side of the first half housing 110 opposite to the second half housing 120, and the head housing 150 covers the saw blade to provide protection above the saw blade.

[0043] In this embodiment, the head shell 150 is provided with a threaded hole 151, which communicates with the first connecting hole 111, the second connecting hole 142 and the third connecting hole 132. The connecting bolt 170 passes through the first connecting hole 111, the second connecting hole 142 and the third connecting hole 132 and then engages with the threaded hole 151, thereby realizing the connection of the first half shell 110, the housing 130, the mounting bracket 140 and the head shell 150.

[0044] In addition, in other embodiments, the head shell 150 may also be connected to the first half shell 110 in other suitable ways.

[0045] Reference Figure 4 and Figure 6A limiting groove 143 is formed on the side of the mounting bracket 140 facing the second half-shell 120 (i.e., the side of the mounting bracket 140 facing the internal cavity of the first half-shell 110), and the output hole 141 communicates with the limiting groove 143. A first bearing 222 is coaxially connected to the rotating shaft 221 of the rotor assembly 220. The first bearing 222 is rotatably engaged with the limiting groove 143. Thus, the rotor assembly 220 is axially and radially limited by the engagement of the first bearing 222 with the limiting groove 143 of the mounting bracket 140, making it difficult for the rotor assembly 220 to move axially or wobble radially.

[0046] In this embodiment, the rotor shaft 221 of the rotor assembly 220 forms a step at the first bearing 222. The step abuts against the side of the first bearing 222 away from the bottom wall of the limiting groove 143, thereby enabling the limiting groove 143 to axially limit the first bearing 222 and the shaft 221. In other embodiments, the first bearing 222 may also be tensioned and sleeved on the outside of the shaft 221.

[0047] The end of the rotor assembly 220's shaft 221 away from the mounting bracket 140 is connected to a shock-absorbing washer 223. The shock-absorbing washer 223 abuts against the bottom wall of the housing 130. That is, the end of the shaft 221 abuts against the bottom wall of the housing 130 through the shock-absorbing washer 223 to reduce the vibration when the rotor assembly 220 rotates.

[0048] Reference Figure 3 and Figure 4 A second bearing 224 is fitted inside the inner ring of the damping washer 223, and the inner ring of the second bearing 224 is fitted outside the rotating shaft 221 of the rotor assembly 220. The second bearing 224 is provided between the rotating shaft 221 and the damping washer 223, so that both ends of the rotating shaft 221 are supported and axially limited by the bearing, making the rotating shaft 221 more stable and reducing wear when rotating.

[0049] The rotating shaft 221 also has a step at the second bearing 224. The step abuts against the side of the second bearing 224 away from the bottom wall of the mounting cavity 131 to axially limit the second bearing 224.

[0050] In this embodiment, the bottom wall of the housing 130 is provided with a limiting groove 133, and the shock-absorbing washer 223 fits into the limiting groove 133. The limiting groove 133 limits the shock-absorbing washer 223 and the rotating shaft 221 radially and axially, so that the rotor assembly 220 is not easy to move axially or deviate radially.

[0051] Reference Figures 2 to 4A baffle ring 160 is detachably connected to the opening of the housing 130, and the side of the stator assembly 210 facing the opening of the mounting cavity 131 abuts against the baffle ring 160. A limiting step 134 is provided radially inwardly protruding from the inner wall of the housing 130, and the side of the stator assembly 210 facing the bottom wall of the mounting cavity 131 abuts against the limiting step 134. The opposite sides of the stator assembly 210 abut against the baffle ring 160 and the limiting step 134 respectively, so as to axially limit the stator assembly 210 within the housing 130.

[0052] In this embodiment, the wind deflector 160 is detachably connected to the opening edge of the housing 130 by screws. In other embodiments, the wind deflector 160 may also be connected to the housing 130 in other suitable ways.

[0053] The assembly method of the electric circular saw 1000 in this embodiment is as follows: 1. Install the stator assembly 210 into the housing 130, and connect the wind baffle 160 to the housing 130 with screws.

[0054] 2. Assemble the shock-absorbing washer 223, the first bearing 222, and the second bearing 224 onto the rotor assembly 220. Insert the rotor assembly 220 into the housing 130 through the output window 112. Then, arrange the mounting bracket 140 and the head shell 150 sequentially outside the first half-shell 110, aligning the connecting hole, the second connecting hole 142, the third connecting hole 132, and the threaded hole 151. Then, pass the connecting bolt 170 through the first connecting hole 111, the second connecting hole 142, the third connecting hole 132, and the threaded hole 151.

[0055] 3. Fasten the second half shell 120 to the first half shell 110, and connect the first half shell 110 and the second half shell 120 with bolts.

[0056] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. An electric circular saw, characterized in that, The electric circular saw (1000) includes a handle housing (100), a drive motor (200), and a saw blade. The handle housing (100) includes a first half-shell (110), a second half-shell (120), and a housing (130). The first half-shell (110) is fixedly connected to the second half-shell (120). The housing (130) is fixedly disposed inside the first half-shell (110) and the second half-shell (120). The housing (130) is provided with a mounting cavity (131) with an opening facing the first half-shell (110). The drive motor (200) includes a stator assembly (210) and a rotor assembly (220). The stator assembly (210) is fixedly disposed in the mounting cavity (131), and the rotor assembly (220) is rotatably fitted through and engaged with the stator assembly (210). The stator assembly (210) and the rotor assembly (220) are axially confined between the first half-shell (110) and the second half-shell (120). The rotating shaft (221) of the rotor assembly (220) extends out of the first half-shell (110) and is connected to the saw blade drive.

2. The electric circular saw as described in claim 1, characterized in that, The first half-shell (110) has an output window (112), and the first half-shell (110) is detachably connected to a mounting bracket (140). The mounting bracket (140) covers the output window (112), and the mounting bracket (140) has an output hole (141). The shaft (221) of the rotor assembly (220) extends out of the output hole (141).

3. The electric circular saw as described in claim 2, characterized in that, The first half-shell (110) has a first connecting hole (111), and the mounting bracket (140) has a second connecting hole (142) aligned with the first connecting hole (111). The first connecting hole (111) and the second connecting hole (142) pass through a connecting bolt (170) to connect the mounting bracket (140) and the first half-shell (110).

4. An electric circular saw as described in claim 2, characterized in that, The mounting bracket (140) has a limiting groove (143) on the side facing the second half shell (120), and the output hole (141) is connected to the limiting groove (143); the rotor assembly (220) has a first bearing (222) coaxially connected to the shaft (221), and the first bearing (222) is rotatably fitted into the limiting groove (143).

5. An electric circular saw as described in claim 4, characterized in that, The rotor assembly (220) has a shaft (221) connected to a shock-absorbing washer (223) at the end away from the mounting bracket (140), and the shock-absorbing washer (223) abuts against the bottom wall of the housing (130).

6. An electric circular saw as described in claim 5, characterized in that, The inner ring of the damping washer (223) is fitted with a second bearing (224), and the inner ring of the second bearing (224) is fitted outside the rotating shaft (221) of the rotor assembly (220).

7. An electric circular saw as described in claim 1, characterized in that, A windshield ring (160) is detachably connected to the opening of the housing (130), and the side of the stator assembly (210) facing the opening of the mounting cavity (131) abuts against the windshield ring (160); a limiting step (134) is provided on the inner wall of the housing (130), and the side of the stator assembly (210) facing the bottom wall of the mounting cavity (131) abuts against the limiting step (134).

8. An electric circular saw as described in claim 3, characterized in that, The handle housing (100) also includes a head shell (150), which is detachably connected to the side of the first half-shell (110) opposite to the second half-shell (120) and covers the saw blade.

9. An electric circular saw as described in claim 8, characterized in that, The head shell (150) has a threaded hole (151) that communicates with the first connecting hole (111) and the second connecting hole (142). The connecting bolt (170) passes through the first connecting hole (111) and the second connecting hole (142) and then engages with the threaded hole (151).

10. An electric circular saw as described in claim 1, characterized in that, The second half-shell (120) has a clearance opening (121) on the side opposite to the first half-shell (110), and the end of the housing (130) opposite to the first half-shell (110) extends out of the clearance opening (121).

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