Handheld electric reciprocating saw
By designing an aluminum support shell with air trough and ventilation window in a handheld electric reciprocating saw, the problem of neck overheating is solved, and efficient heat dissipation without the need for thermal insulation rubber sleeves is achieved .
Patent Information
- Application Number
- CN202420639454.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-29
Smart Images
Figure CN222154135U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a reciprocating saw, in particular to a handheld electric reciprocating saw, belonging to the technical field of electric tools. Background Art
[0002] A handheld electric reciprocating saw is a commonly used electric tool. Its basic structure has long been disclosed in the Chinese patent document application number 00249316.0, and includes a housing, a motor, a reciprocating swing mechanism, and a saw blade chuck device. The reciprocating swing mechanism uses a swing shaft to form an inclination angle between the central axes of the two bearings in the swing bearing sleeve and the swing core shaft. When the motor drives the large gear, it drives the swing bearing sleeve and the output shaft to perform reciprocating linear motion, which has the advantages of low loss and high efficiency.
[0003] When operating, in addition to holding the handle at the rear end of the shell, you also need to grasp the neck on the front side of the shell. Since the neck on the front side of the shell supports the high-speed reciprocating knife rod through the shell, it is easy to heat up. In order to avoid excessive temperature, the existing technology uses aluminum materials with good heat dissipation performance to make the shell. But even so, when the ambient temperature is high, the temperature of the neck will still feel hot, so it is often necessary to wrap it with a heat-insulating rubber sleeve. Utility Model Content
[0004] The utility model aims to solve the problems existing in the prior art and to provide a handheld electric reciprocating saw which can effectively suppress the neck temperature without a heat-insulating rubber sleeve through structural improvement.
[0005] In order to achieve the above-mentioned purpose, the basic technical scheme of the handheld electric reciprocating saw of the utility model is as follows: it comprises a housing having a handle at the rear end and an auxiliary gripping part at the front side, an aluminum support housing is fixed inside the housing, a drive motor with a fan is installed on the rear plate of the support housing, the drive motor is connected to a reciprocating knife bar through a transmission mechanism located in the middle of the support housing, and the knife bar is supported at the front of the support housing corresponding to the auxiliary gripping part;
[0006] The support shell is provided with air slots which are spaced apart in the circumferential direction, and the rear end plate is provided with ventilation windows which allow the airflow of the fan to pass through and reach the air slots.
[0007] In this way, not only is the heat dissipation capacity enhanced as the surface area of the supporting shell is significantly increased, but also because the ventilation window directs the airflow of the motor fan to the wind slot, the heat dissipation effect is significantly improved by convection, so that heat will not be retained between the supporting shell and the neck of the outer shell, effectively suppressing the neck temperature.
[0008] The further improvement of the utility model is that the support shell is composed of a connected cylindrical front section, a disc-shaped middle section and a rear end disc; the axis of the front section is consistent with the reciprocating motion direction of the knife rod, and the axis of the middle section is perpendicular to the axis of the front section and deviates from the axis of the front section. In this way, a compact and reasonable support structure is formed.
[0009] A further improvement of the utility model is that the air passage extends from the end of the front section to the middle section, so that it is more convenient for the ventilation window to guide the airflow of the motor fan to the air passage.
[0010] A further improvement of the utility model is that the portion of the middle section outer surface that deviates from the front section has radial heat dissipation reinforcing ribs.
[0011] A further improvement of the utility model is that the ventilation windows are circumferentially spaced and distributed on the rear end plate.
[0012] The utility model is further improved in that: the air passage slot has a circular arc bottom. This structure not only has good processability, but also helps to ensure smooth airflow. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 The figure is a schematic diagram of the three-dimensional structure of the whole machine according to one embodiment of the utility model.
[0014] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure with half of the outer shell and battery pack removed.
[0015] Figure 3 for Figure 2 Schematic diagram of the three-dimensional structure from another perspective.
[0016] Figure 4 This is a schematic diagram of the three-dimensional structure of the prior art with half of the outer shell and battery pack removed. DETAILED DESCRIPTION Example
[0017] The hand-held electric reciprocating saw of this embodiment is as follows Figure 1 As shown, it includes a combined structural shell 1 with a handle 1-1 at the rear end and an auxiliary grasping portion 1-2 at the front neck, and a battery pack 1-3 is installed at one end of the handle 1-1.
[0018] like Figure 2 and Figure 3As shown, an aluminum support shell 2 is fixed in the housing 1, and the support shell 2 includes a cylindrical front section 2-1 supporting a reciprocating knife bar 3, a disc-shaped middle section 2-2 supporting a transmission mechanism for realizing rotation-linear reciprocating motion conversion, and a rear end plate 2-4 for installing a drive motor 4 with a fan 5. The axis of the cylindrical front section 2-1 is consistent with the reciprocating direction of the knife bar 3, and the axis of the disc-shaped middle section 2-2 is perpendicular to the axis of the cylindrical front section 2-1 and deviates from the axis of the cylindrical front section 2-1.
[0019] The driving motor 4 is connected to the reciprocating knife rod 3 through a transmission mechanism located in the middle of the supporting shell 2 , and the supporting position of the knife rod 3 corresponds to the auxiliary grasping part 1 - 2 of the shell 1 .
[0020] In order to effectively enhance the heat dissipation effect of the supporting shell 2 and thereby suppress the temperature of the outer shell 1, the supporting shell is provided with circular arc bottom air grooves 2-3 spaced circumferentially, and the rear end plate 2-4 is provided with ventilation windows 2-5 spaced circumferentially. The air grooves 2-3 extend from the end of the cylindrical front section 2-1 to the disc-shaped middle section 2-2, and the radial position of the ventilation windows 2-5 corresponds to the air grooves 2-3, allowing the airflow of the fan 5 to reach the air grooves 2-3. The outer surface of the disc-shaped middle section 2-2 deviates from the cylindrical front section 2-1 and has radially radiating heat dissipation reinforcement ribs 2-6, which are beneficial to heat dissipation and ensure the support rigidity.
[0021] This embodiment Figure 3 Hand-held electric reciprocating saw with Figure 4 A comparative test of the original structure without air slots and ventilation windows shows that, since the heat dissipation surface area of the support shell of this embodiment is significantly increased, and the airflow of the motor fan forms strong convection heat dissipation in the air slots with the help of the ventilation windows, the temperature rise of the support shell is effectively reduced, and even without the heat-insulating rubber sleeve, the auxiliary grasping part of the front neck of the shell will not be hot.
[0022] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.
Claims
1. A handheld electric reciprocating saw, comprising a housing having a handle at the rear end and an auxiliary gripping portion at the front side, an aluminum support housing fixed inside the housing, a drive motor with a fan mounted on the rear end plate of the support housing, the drive motor being connected to a reciprocating cutter bar through a transmission mechanism located in the middle of the support housing, the cutter bar being supported at the front of the support housing corresponding to the auxiliary gripping portion; Features: The support shell is provided with air slots which are spaced apart in the circumferential direction, and the rear end plate is provided with ventilation windows which allow the airflow of the fan to pass through and reach the air slots.
2. The handheld electric reciprocating saw according to claim 1, characterized in that: The support shell is composed of a connected cylindrical front section, a disc-shaped middle section and a rear end disc; the axis of the front section is consistent with the reciprocating motion direction of the knife rod, and the axis of the middle section is perpendicular to the axis of the front section and deviates from the axis of the front section.
3. The handheld electric reciprocating saw according to claim 2, characterized in that: The air passage extends from the end of the front section to the middle section.
4. The handheld electric reciprocating saw according to claim 3, characterized in that: The portion of the middle section outer surface that deviates from the front section has radial heat dissipation reinforcement ribs.
5. The handheld electric reciprocating saw according to claim 4, characterized in that: The ventilation windows are circumferentially spaced and distributed on the rear end plate.
6. The handheld electric reciprocating saw according to claim 5, characterized in that: The air passage has a circular bottom.