Lengthened angle grinder

Abstract

The utility model provides a lengthened angle grinder, and belongs to the technical field of electric tools. The angle grinder solves the problems that due to the fact that the total height of an existing grinding wheel and a machine shell is large, when the angle grinder is used, some narrow spaces cannot stretch into the angle grinder, and the like. A machine shell comprises a front shell body and a rear shell body, a front installation portion is arranged on the front shell body, the whole front shell body is flat and long, a containing space is formed between the lower portion of the front shell body and the front installation portion, and a grinding wheel is located in the containing space. The transmission assembly comprises a lengthened shaft, a small bevel gear fixedly connected with the lengthened shaft and a large bevel gear fixedly connected with the grinding wheel, the small bevel gear is meshed with the large bevel gear, and the lengthened shaft and an output shaft of the motor are fixedly connected and coaxially arranged. The front shell of the angle grinder has the advantages that the lengthening shaft is additionally arranged, the size of the whole front shell is lengthened, the total height of the front shell and the grinding wheel is reduced, and the angle grinder can be used in a small space.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology and relates to an extended angle grinder. Background Technology

[0002] An angle grinder is an electric tool that uses a high-speed rotating grinding wheel to grind, cut, remove rust, and polish metal components. An angle grinder mainly consists of a housing, a motor, and a grinding wheel. The motor's output shaft drives the grinding wheel to rotate through a transmission assembly, which includes a small bevel gear fixed to the motor's output shaft and a large bevel gear fixed to the grinding wheel. The small and large bevel gears mesh vertically.

[0003] The small bevel gears on existing angle grinders on the market are directly mounted on the output shaft of the motor. Therefore, the grinding wheel is very close to the motor. Since the motor has a large diameter, the size of the housing used to enclose the motor is also relatively large. Therefore, the grinding wheel must be installed below the housing so that the position of the grinding wheel does not interfere with the housing. This results in a relatively high total height of the grinding wheel and the housing. When using the angle grinder, it cannot reach into some narrow spaces.

[0004] When changing the grinding wheel on an angle grinder, a locking mechanism is usually needed to restrict the rotation of the grinding wheel shaft and lock the small or large bevel gear. Existing locking mechanisms typically consist of a pin, an end cap, and a spring. Pressing the end cap compresses the spring, inserting the pin into the hole of the small or large bevel gear. However, the installation of the pin and end cap on commercially available angle grinders usually requires fasteners or retaining rings, and the pin is in direct frictional contact with the machine housing, making it very prone to wear and seizing. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems of existing angle grinders by proposing an angle grinder that increases the distance between the grinding wheel and the motor, reduces the height between the grinding wheel and the front end of the machine housing, and facilitates operation in confined spaces.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An extended angle grinder includes a housing and a motor, a grinding wheel, and a transmission assembly for connecting the motor and the grinding wheel, all mounted on the housing. The housing includes a front housing and a rear housing. The motor is located inside the rear housing, and the transmission assembly is located inside the front housing. The front housing has a front mounting portion, and the rear housing has a rear mounting portion. The front housing and the rear housing are fixedly connected by the front mounting portion and the rear mounting portion.

[0008] The feature is that the front shell is generally flat and long, and there is a receiving space between the lower part of the front shell and the front mounting part, in which the grinding wheel is located; the transmission component includes an extended shaft, a small bevel gear fixedly connected to the extended shaft, and a large bevel gear fixedly connected to the grinding wheel, the small bevel gear meshing with the large bevel gear, and the extended shaft fixedly connected to the output shaft of the motor and the two being coaxially arranged.

[0009] In the aforementioned extended angle grinder, the extended shaft is fixedly connected to the output shaft of the motor via a sleeve assembly. The sleeve assembly includes an inner bushing and an outer bushing. The inner bushing is fixedly connected to the extended shaft, and the outer bushing is sleeved on and fixedly connected to the output shaft of the motor. The inner bushing and the outer bushing are fixedly connected.

[0010] In the aforementioned extended angle grinder, a cavity is formed on the outer bushing, and the inner bushing is embedded in the cavity; the outer end face of the inner bushing is flush with the outer bushing.

[0011] In the aforementioned extended angle grinder, the front housing is further provided with an anti-rotation mechanism for locking the small bevel gear. The anti-rotation mechanism includes a pin hole opened on the small bevel gear and a pin assembly movably disposed on the front housing. The pin assembly includes a pin shaft and a spring. The front housing has an internal and external through mounting hole. The pin shaft is disposed in the mounting hole, and the spring is sleeved on the pin shaft. The two ends of the spring are pressed against the front housing and the pin shaft respectively. Pressing the pin shaft compresses the spring, so that the pin shaft is inserted into the pin hole on the small bevel gear to form a lock.

[0012] In the aforementioned extended angle grinder, the outer end of the pin is provided with an end cap, which can rotate relative to the pin.

[0013] In the aforementioned extended angle grinder, the end cap has a through hole, a retaining ring is provided on the inner wall of the through hole, a guide slope is provided on one side of the retaining ring, and a boss is provided on the outer end of the pin. The boss presses against the retaining ring along the guide slope and passes over the retaining ring into the through hole until the end face of the boss is blocked by the retaining ring, which is used to prevent the end cap from coming off the pin.

[0014] In the aforementioned extended angle grinder, the outer end of the boss is provided with a chamfer that matches the guide slope.

[0015] In the aforementioned extended angle grinder, a sliding bushing is also fixedly sleeved on the pin. The pin is movably mounted in the mounting hole through the sliding bushing, and the outer diameter of the sliding bushing is adapted to the inner diameter of the mounting hole.

[0016] In the aforementioned extended angle grinder, the two ends of the spring are pressed against the sliding bushing and the end cap, respectively.

[0017] In the aforementioned extended angle grinder, the front housing is further provided with a recessed hole that communicates with the mounting hole. The mounting hole and the recessed hole are coaxially arranged. The inner diameter of the recessed hole is larger than the outer diameter of the end cap. Pressing the end cap compresses the spring, causing the end cap to be embedded in the recessed hole.

[0018] In the aforementioned extended angle grinder, the sliding bushing includes a copper sleeve.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Compared with ordinary angle grinders, this utility model adds an extended shaft between the motor output shaft and the small bevel gear, which lengthens the entire front shell and reduces the total height of the front shell and the grinding wheel, allowing the angle grinder to be used in relatively small spaces.

[0021] 2. The installation of the pin and end cover does not require any fasteners or snap rings. Simply press the pin into the through hole of the end cover. Through the cooperation of the inclined surfaces of the two, the boss is squeezed and passes through the retaining ring and is blocked by the retaining ring, which prevents the end cover from coming off the pin. The installation is simple, convenient and quick, and saves costs.

[0022] 3. The pin is movably mounted in the mounting hole of the front housing through a sliding bushing, which greatly reduces the wear of the pin; the copper bushing is used as a sliding bushing, which has excellent wear resistance, sliding and self-lubricating properties, and is not prone to seizing, reducing the friction between the pin and the front housing, and making the sliding smoother. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the angle grinder of this utility model;

[0024] Figure 2 This is a schematic diagram of an existing angle grinder;

[0025] Figure 3 This is a side view of the angle grinder of this utility model;

[0026] Figure 4 This is a partially enlarged sectional view of the angle grinder of this utility model;

[0027] Figure 5 This is an installation diagram of the motor, grinding wheel and transmission assembly of this utility model;

[0028] Figure 6 This is an installation diagram of the extended shaft, motor, and sleeve assembly of this utility model;

[0029] Figure 7 This is an enlarged cross-sectional view of the anti-rotation mechanism of this utility model;

[0030] Figure 8 This is an enlarged sectional view of the pin and end cap of this utility model.

[0031] In the diagram, 1. Front housing; 2. Rear housing; 3. Motor; 4. Grinding wheel; 5. Extended shaft; 6. Small bevel gear; 7. Large bevel gear; 8. Inner bushing; 9. Outer bushing; 10. Front mounting part; 11. Rear mounting part; 12. Pin; 13. End cover; 14. Spring; 15. Mounting hole; 16. Through hole; 17. Retaining ring; 18. Guide slope; 19. Boss; 20. Chamfer; 21. Sliding bushing; 22. Concave hole. Detailed Implementation

[0032] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0033] like Figure 1 As shown, the extended angle grinder of this utility model includes a housing, a motor 3, a grinding wheel 4, and a transmission assembly for connecting the motor 3 and the grinding wheel 4, all mounted on the housing. The housing includes a front housing 1 and a rear housing 2. The motor 3 is located inside the rear housing 2, and the transmission assembly is located inside the front housing 1. The front housing 1 has a front mounting part 10, and the rear housing 2 has a rear mounting part 11. The front housing 1 and the rear housing 2 are fixedly connected by the front mounting part 10 and the rear mounting part 11.

[0034] Appendix Figure 2 This is a schematic diagram of an existing angle grinder on the market. The small bevel gear 6 on the angle grinder is directly mounted on the output shaft of the motor 3. The grinding wheel 4 is located very close to the motor 3. The grinding wheel 4 is located below the front mounting part 10 and the rear mounting part 11. The overall height of the grinding wheel 4 and the front housing 1 is relatively high.

[0035] like Figure 3 As shown, the front shell 1 of this utility model is generally flat and elongated, and there is a receiving space between the lower part of the front shell 1 and the front mounting part 10, in which the grinding wheel 4 is located; as Figure 4 and Figure 5 As shown, the transmission assembly includes an extended shaft 5, a small bevel gear 6 fixedly connected to the extended shaft 5, and a large bevel gear 7 fixedly connected to the grinding wheel 4. The small bevel gear 6 and the large bevel gear 7 mesh with each other. The extended shaft 5 is fixedly connected to the output shaft of the motor 3 and the two are coaxially arranged.

[0036] like Figure 6 As shown, the extended shaft 5 is fixedly connected to the output shaft of the motor 3 via a sleeve assembly. The sleeve assembly includes an inner bushing 8 and an outer bushing 9. The inner bushing 8 is fixedly connected to the extended shaft 5, and the outer bushing 9 is sleeved on and fixedly connected to the output shaft of the motor 3. The inner bushing 8 and the outer bushing 9 are fixedly connected. A cavity is formed on the outer bushing 9, and the inner bushing 8 is embedded in the cavity. The outer end faces of the inner bushing 8 and the outer bushing 9 are flush.

[0037] like Figure 7 As shown, the front housing 1 is also provided with an anti-rotation mechanism for locking the small bevel gear 6. The anti-rotation mechanism includes a pin hole opened on the small bevel gear 6 and a pin assembly movably arranged on the front housing 1. The pin assembly includes a pin shaft 12 and a spring 14. The front housing 1 has an inner and outer through mounting hole 15. The pin shaft 12 is arranged in the mounting hole 15. The spring 14 is sleeved on the pin shaft 12, and the two ends of the spring 14 are pressed against the front housing 1 and the pin shaft 12 respectively. Pressing the pin shaft 12 compresses the spring 14 so that the pin shaft 12 is inserted into the pin hole on the small bevel gear 6 to form a lock.

[0038] The outer end of the pin 12 is provided with an end cap 13, which can rotate relative to the pin 12. Figure 8 As shown, the end cap 13 has a through hole 16, and a retaining ring 17 is provided on the inner wall of the through hole 16. A guide slope 18 is provided on one side of the retaining ring 17. A boss 19 is provided on the outer end of the pin 12. The boss 19 presses against the retaining ring 17 along the guide slope 18 and passes over the retaining ring 17 into the through hole 16 until the end face of the boss 19 is blocked by the retaining ring 17, which is used to prevent the end cap 13 from dislodging from the pin 12. The outer end of the boss 19 is provided with a chamfer 20 that cooperates with the guide slope 18. The cooperation between the chamfer 20 and the guide slope 18 facilitates the installation of the end cap 13 and the pin 12.

[0039] A sliding bushing 21 is also fixedly sleeved on the pin 12. The pin 12 is movably mounted in the mounting hole 15 through the sliding bushing 21, and the outer diameter of the sliding bushing 21 matches the inner diameter of the mounting hole 15. The two ends of the spring 14 are respectively pressed against the sliding bushing 21 and the end cap 13. The pin 12 is movably mounted in the mounting hole 15 of the front housing 1 through the sliding bushing 21, which greatly reduces the wear of the pin 12. The sliding bushing 21 includes a copper sleeve; the copper sleeve, used as the sliding bushing 21, has excellent wear resistance, sliding properties, and self-lubricating properties, and is not prone to seizing, reducing the friction between the pin 12 and the front housing 1, and making the sliding smoother.

[0040] The front shell 1 is also provided with a recessed hole 22 that communicates with the mounting hole 15. The mounting hole 15 and the recessed hole 22 are coaxially arranged. The inner diameter of the recessed hole 22 is larger than the outer diameter of the end cover 13. Pressing the end cover 13 compresses the spring 14 so that the end cover 13 is embedded in the recessed hole 22.

[0041] It should be understood that in the claims and description of this utility model, all instances of "comprising..." should be understood as having an open meaning, that is, their meaning is equivalent to "containing at least...", and should not be understood as having a closed meaning, that is, their meaning should not be understood as "containing only...".

[0042] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An elongated angle grinder, comprising a casing and a motor (3), a grinding wheel (4), a transmission assembly for connecting the motor (3) and the grinding wheel (4) arranged on the casing, the casing comprising a front casing (1) and a rear casing (2), the motor (3) being arranged in the rear casing (2) and the transmission assembly being arranged in the front casing (1), the front casing (1) being provided with a front mounting portion (10), the rear casing (2) being provided with a rear mounting portion (11), and the front casing (1) and the rear casing (2) being fixedly connected through the front mounting portion (10) and the rear mounting portion (11). characterized in that The front casing (1) is integrally formed in an elongated shape, and a receiving space is formed between the front casing (1) and the front mounting portion (10), and the grinding wheel (4) is arranged in the receiving space; the transmission assembly comprises an elongated shaft (5), a small bevel gear (6) fixedly connected with the elongated shaft (5), and a large bevel gear (7) fixedly connected with the grinding wheel (4), the small bevel gear (6) being engaged with the large bevel gear (7), and the elongated shaft (5) being coaxially arranged with an output shaft of the motor (3).

2. The extended-angle grinder of claim 1, wherein The elongated shaft (5) is fixedly connected with the output shaft of the motor (3) through a sleeve assembly, the sleeve assembly comprising an inner sleeve (8) and an outer sleeve (9), the inner sleeve (8) being fixedly connected with the elongated shaft (5), the outer sleeve (9) being sleeved on the output shaft of the motor (3) and being fixedly connected with the output shaft, and the inner sleeve (8) being fixedly connected with the outer sleeve (9).

3. The extended-angle grinder of claim 2, wherein A recess is formed in the outer sleeve (9), and the inner sleeve (8) is embedded in the recess; the outer end surface of the inner sleeve (8) is flush with the outer end surface of the outer sleeve (9).

4. The extended-angle grinder of claim 1, wherein A rotation stopping mechanism is further arranged on the front casing (1) for locking the small bevel gear (6), the rotation stopping mechanism comprising a pin hole formed in the small bevel gear (6) and a latch assembly movably arranged on the front casing (1), the latch assembly comprising a pin shaft (12) and a spring (14), an installation hole (15) being formed in the front casing (1) and extending through the front casing (1), the pin shaft (12) being arranged in the installation hole (15), the spring (14) being sleeved on the pin shaft (12), and the two ends of the spring (14) being tightly pressed against the front casing (1) and the pin shaft (12) respectively, the spring (14) being compressed by pressing the pin shaft (12) so that the pin shaft (12) is inserted into the pin hole of the small bevel gear (6) to form locking.

5. The extended-angle grinder of claim 4, wherein An end cover (13) is arranged on the outer end of the pin shaft (12), and the end cover (13) is rotatable relative to the pin shaft (12).

6. The extended-angle grinder of claim 5, wherein A through hole (16) is formed in the end cover (13), a retaining ring (17) is arranged on the inner wall of the through hole (16), a guide inclined surface (18) is arranged on one side of the retaining ring (17), a boss (19) is arranged on the outer end of the pin shaft (12), the boss (19) is pressed against the retaining ring (17) along the guide inclined surface (18) and passes through the retaining ring (17) to enter the through hole (16), until the end surface of the boss (19) is blocked by the retaining ring (17) to limit the end cover (13) from being separated from the pin shaft (12).

7. The extended-angle grinder of claim 6, wherein A chamfer (20) is arranged on the outer end of the boss (19) and cooperates with the guide inclined surface (18).

8. The extended-angle grinder of claim 5, wherein, The pin shaft (12) is further fixed with a sliding bushing (21), the pin shaft (12) is movably arranged in the mounting hole (15) through the sliding bushing (21), the outer diameter size of the sliding bushing (21) is matched with the inner diameter size of the mounting hole (15); the two ends of the spring (14) are respectively pressed against the sliding bushing (21) and the end cover (13).

9. The extended-angle grinder of claim 5, wherein, The front shell (1) is further provided with a recess (22) communicated with the mounting hole (15), the mounting hole (15) and the recess (22) are coaxially arranged, the inner diameter size of the recess (22) is greater than the outer diameter size of the end cover (13), the spring (14) is compressed by pressing the end cover (13), so that the end cover (13) is embedded in the recess (22).

10. The extended-angle grinder of claim 8, wherein The sliding bushing (21) comprises a copper sleeve.

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