CN220807226U - Electric hammer - Google Patents

Abstract

An electric hammer comprises a shell, a motor, a transmission shell, a transmission mechanism and an output shaft, wherein the motor is accommodated in the shell, the transmission mechanism is arranged in a reduction gearbox, the transmission mechanism is configured to transmit power of the motor to the output shaft, the transmission shell comprises a base and an upper cover, the base is provided with a top opening, a reduction assembly can be installed in the transmission shell from the top, and the upper cover can seal the opening to form an accommodating space for accommodating the reduction assembly; the transmission mechanism comprises an impact assembly, the impact assembly comprises an intermediate shaft and an eccentric mechanism driven by the intermediate shaft, the motor comprises a motor shaft, the intermediate shaft and the eccentric mechanism are configured to convert rotary motion of the motor shaft into impact motion of an output shaft, the electric hammer comprises a first bearing and a second bearing which are sleeved on the intermediate shaft, the first bearing is arranged at one end far away from the motor, and the second bearing is arranged at one end close to the motor.

Description

Electric hammer

Technical Field

The utility model relates to the field of electric tools, in particular to an electric hammer.

Background

Electric hammers are taken as examples of electric tools, and common multifunctional electric hammers generally have multiple functions such as a single drill, a hammer drill, a single hammer and the like, and can be switched among several functions according to different operation requirements. At present, three metal structural members (a middle cover, a box body and a front shell) are generally adopted for a gear box of the electric hammer with relatively large power in the market, and the cost is high; or the gear box adopts a metal structural member with an open top, and the shaft of the eccentric structure for realizing the impact function is generally supported by adopting a cantilever structure, namely a single bearing.

The adoption of the single box structure has the advantages of few metal supporting pieces and lower machine cost, and the defect that the gear is poor in meshing and easy to fail due to the fact that the intermediate shaft is stressed and is easy to bend. The service life of the machine is shortened, the working efficiency is greatly influenced, the use cost of a user is increased, and great trouble is brought to the user.

Disclosure of utility model

The utility model aims to overcome the defects in the prior art, changes a cantilever structure into a double-bearing supporting structure, and provides an electric hammer with a more stable supporting structure and longer service life. The utility model is realized by the following technical scheme:

The utility model provides an electric hammer, includes the casing, holds in motor, drive shell, locates drive mechanism and the output shaft in the reducing gear box of casing, drive mechanism configures to the power transmission to the output shaft of motor, its characterized in that:

The drive housing includes a base having a top opening such that the reduction assembly can be top-mounted into the drive housing, and an upper cover closing the opening to form a receiving space for receiving the reduction assembly.

The transmission mechanism comprises an impact assembly, the impact assembly comprises an intermediate shaft and an eccentric mechanism driven by the intermediate shaft, the motor comprises a motor shaft, the intermediate shaft and the eccentric mechanism are configured to convert rotary motion of the motor shaft into impact motion of an output shaft, the electric hammer comprises a first bearing and a second bearing which are sleeved on the intermediate shaft, the first bearing is arranged at one end far away from the motor, and the second bearing is arranged at one end close to the motor.

Further, the impact assembly includes a first gear positioned between the first bearing and the second bearing.

Further, the intermediate shaft defines a first axis, the first bearing and the second bearing are arranged along the first axis, the ratio of the sum of the sizes of the first bearing and the second bearing on the first axis to the length of the intermediate shaft is greater than 1/2, and the first bearing and the second bearing are respectively arranged at two ends of the intermediate shaft so as to better support the intermediate shaft.

Further, the motor shaft is provided with meshing teeth which mesh with the first gear to transmit torque.

Further, the diameter of the first gear is smaller than that of the first bearing, the diameter of the second bearing is smaller than that of the first gear, the first bearing, the first gear and the second gear are sequentially sleeved on the intermediate shaft along a first axis, and the diameters of the first bearing and the second gear are sequentially reduced along the direction close to the motor, so that the assembly is facilitated.

Further, the first bearing is a ball bearing, and the second bearing is an oil-containing bearing.

Further, the housing limits the first bearing and the second bearing.

Further, the upper cover is made of plastic, and the base is made of metal or metal alloy.

The cantilever structure is changed into a double-bearing supporting structure by the electric hammer, the intermediate shaft is supported by the first bearing and the second bearing, and the first bearing and the second bearing are respectively positioned at two ends of the intermediate shaft, so that the intermediate shaft is stably supported and is not easy to bend under stress, the stability of meshing of the meshing teeth and the first gear is improved, the service life of the electric hammer is prolonged, and the operation efficiency of a user is greatly improved. And the diameter of the first bearing is larger than that of the first gear and that of the second bearing, namely the size of the intermediate shaft is reduced from top to bottom in sequence, so that the assembly is convenient for an assembler to install, the operation is more convenient, and the working efficiency of the assembler is greatly improved.

Drawings

Fig. 1 is a schematic view, partially in section, of an electric hammer according to one embodiment of the present application.

Fig. 2 is a partial enlarged view of the electric hammer shown in fig. 1.

Fig. 3 is an assembled schematic view of the intermediate shaft, the first bearing, the first gear, and the eccentric wheel of the electric hammer shown in fig. 1.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, the present utility model provides an electric hammer including a housing 100 (not shown), a motor 200 accommodated in the housing 100, a transmission case configured to transmit power of the motor 200 to an output shaft, a transmission mechanism provided in the transmission case 300, and an output shaft (not shown), the transmission case including a base (not shown) having a top opening (not shown) so that a reduction assembly can be mounted into the transmission case from the top, and an upper cover (not shown) which can close the opening to form an accommodating space accommodating the reduction assembly. Alternatively, the base is made of metal or metal alloy for providing sufficient strength, and the upper cover is made of plastic, thereby contributing to the cost reduction of the transmission case.

The transmission mechanism comprises an impact assembly 7, the impact assembly 7 comprises a middle shaft 1 and an eccentric mechanism 400 driven by the middle shaft 1, the motor 200 comprises a motor shaft 6, the middle shaft 1 and the eccentric mechanism are configured to convert rotary motion of the motor shaft 6 into impact motion of an output shaft, the electric hammer comprises a first bearing 2 and a second bearing 3 which are sleeved on the middle shaft 1, the first bearing 2 is arranged at one end far away from the motor 200, and the second bearing 3 is arranged at one end close to the motor 200, so that the middle shaft is reliably supported, and sufficient supporting strength and supporting precision are ensured.

Preferably, the impact assembly 7 further comprises a first gear 4, said first gear 4 being located between said first bearing 2 and said second bearing 3. The intermediate shaft 1 defines a first axis 5, the first bearing 2 and the second bearing 3 are arranged along the first axis 5, and the ratio of the sum of the dimensions of the two on the first axis 5 to the length of the intermediate shaft 1 is greater than 1/2, thereby providing a sufficiently large supporting surface, which is beneficial for further improving the supporting stability.

Preferably, the motor shaft 6 is provided with engagement teeth 61, the engagement teeth 61 being engaged with the first gear 4 to transmit torque. The diameter of the first gear 4 is smaller than that of the first bearing 2, the diameter of the second bearing 3 is smaller than that of the first gear 4, the first bearing 2, the first gear 4 and the second gear are sequentially sleeved on the intermediate shaft 1 along a first axis 5, and the diameters of the first gear and the second gear are sequentially reduced along a direction close to the motor 200, so that the self-opening assembly into the base is facilitated.

Preferably, the first bearing 2 is a ball bearing, the second bearing 3 is an oil-containing bearing, and the diameter of the oil-containing bearing is smaller, so that the internal space is saved. The housing 100 positions the first bearing 2 and the second bearing 3 to support the impact assembly.

The intermediate shaft of the electric hammer is changed from a cantilever structure to a double-bearing supporting structure, the intermediate shaft 1 is supported by the first bearing 2 and the second bearing 3, and the first bearing 2 and the second bearing 3 are respectively positioned at two ends of the intermediate shaft 1, so that the intermediate shaft 1 is stably supported, the meshing stability of the meshing teeth 61 and the first gear 4 is improved, the service life of the electric hammer is prolonged, and the operation efficiency of a user is greatly improved. And the diameter of the first bearing 2 is larger than that of the first gear 4 and the diameter of the second bearing 3, namely the size of the intermediate shaft 1 is reduced from top to bottom in sequence, so that the assembly is convenient for an assembler to install, the operation is more convenient, and the working efficiency of the assembler is greatly improved.

It is to be understood that the drawings illustrate in detail exemplary embodiments, and it is to be understood that the application is not limited to the details or methods set forth in the specification or illustrated in the drawings. It is also to be understood that the terminology is for the purpose of description only and should not be regarded as limiting.

Further modifications and alternative embodiments of various aspects of the invention will be apparent to those skilled in the art in view of this description. Accordingly, this description is to be construed in an illustrative only. The configurations and arrangements shown in the various exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, many modifications (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) may be made without materially departing from the novel teachings and advantages of the subject matter described herein. Some elements shown as integrally formed may be constructed of multiple parts or elements, the positions of elements may be reversed or otherwise varied, and the nature or number or position of discrete elements may be altered or varied. The order or sequence of any process, logic algorithm, or method steps may be varied or re-sequenced according to alternative embodiments. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the various exemplary embodiments without departing from the scope of the present inventions.

Although the present application recites a particular combination of features in the appended claims, various embodiments of the invention are directed to any combination of any of the features described herein, whether or not such combination is presently claimed, and any such combination of features may be claimed in this or a future application. Any feature, element, or component in any of the exemplary embodiments discussed above may be used alone or in combination with any feature, element, or component in any of the other embodiments discussed above.

In various exemplary embodiments, the relative dimensions, including angles, lengths, and radii, as shown in the figures are drawn to scale. Actual measurements of the drawings will disclose the relative dimensions, angles, and proportions of the various exemplary embodiments. The various exemplary embodiments extend to various ranges surrounding the absolute and relative sizes, angles, and proportions that may be determined from the figures. Various exemplary embodiments include any combination of one or more relative dimensions or angles that may be determined from the figures. Furthermore, the actual dimensions not explicitly stated in this specification may be determined by using the ratio of the dimensions measured in the drawings in combination with the explicit dimensions stated in this specification.

Claims (9)

1. The utility model provides an electric hammer, includes the casing, holds in motor, drive shell, locates drive mechanism and the output shaft in the reducing gear box of casing, drive mechanism configures to the power transmission to the output shaft of motor, its characterized in that:

The transmission shell comprises a base and an upper cover, wherein the base is provided with a top opening, so that the speed reducing assembly can be installed into the transmission shell from the top, and the upper cover can seal the opening to form a containing space for containing the speed reducing assembly;

The transmission mechanism comprises an impact assembly, the impact assembly comprises an intermediate shaft and an eccentric mechanism driven by the intermediate shaft, the motor comprises a motor shaft, the intermediate shaft and the eccentric mechanism are configured to convert rotary motion of the motor shaft into impact motion of an output shaft, the electric hammer comprises a first bearing and a second bearing which are sleeved on the intermediate shaft, the first bearing is arranged at one end far away from the motor, and the second bearing is arranged at one end close to the motor.

2. The electric hammer as set forth in claim 1, wherein: the impact assembly includes a first gear positioned between the first bearing and the second bearing.

3. The electric hammer as set forth in claim 1, wherein: the intermediate shaft defines a first axis, the first bearing and the second bearing are disposed along the first axis, and a ratio of a sum of dimensions of the first bearing and the second bearing on the first axis to a length of the intermediate shaft is greater than 1/2.

4. The electric hammer as set forth in claim 2, wherein: the motor comprises a motor shaft, wherein the motor shaft is provided with meshing teeth, and the meshing teeth are meshed with the first gear.

5. The electric hammer as set forth in claim 2, wherein: the diameter of the first gear is smaller than the diameter of the first bearing.

6. The electric hammer as set forth in claim 5, wherein: the diameter of the second bearing is smaller than the diameter of the first gear.

7. The electric hammer as set forth in claim 1, wherein: the first bearing is a ball bearing, and the second bearing is an oil-containing bearing.

8. The electric hammer as set forth in claim 1, wherein: the housing positions the first bearing and the second bearing.

9. The electric hammer as set forth in claim 1, wherein: the upper cover is made of plastic, and the base is made of metal or metal alloy.