A new type of rechargeable electric wrench

Abstract

The utility model relates to electric wrench tool technical field discloses a novel charging type electric wrench, including impact subassembly and motor assembly, the outside of impact subassembly is provided with head shell, the side of head shell near motor assembly is connected with intermediate cover, the inside of intermediate cover is installed gear box subassembly, gear box subassembly is connected with impact subassembly, the utility model discloses a setting 2 exhaust holes on the intermediate cover, when the heat that impact subassembly moves produces cannot be discharged, can be discharged through the exhaust hole, reach the effect of heat dissipation, the wool felt filter membrane that adopts is wool felt material, can prevent internal grease leakage and prevent external dust from entering, reach pressure balance through effective regulation internal air pressure, avoid the failure of sealing element caused by heat accumulation, under the cooperation of regular lubrication, can reduce transmission component wear and tear, prolongs charging type electric wrench service life about 30%.

Description

Technical Field

[0001] This utility model relates to the field of electric wrench tools, and in particular to a novel rechargeable electric wrench. Background Technology

[0002] An electric wrench is a power tool used to tighten and loosen bolts and nuts. Its main components include a motor, gearbox, impact mechanism, battery, power module, and control switch. It replaces traditional manual operation with an electric drive device and is mainly used in mechanical assembly and maintenance scenarios. Cordless electric wrenches usually adopt a closed shell design. The internal transmission components (such as gearbox and impact block) require regular lubrication. Traditional maintenance requires disassembling the shell, gearbox, and other components, which is complicated and can easily damage the sealing structure. In addition, under high-intensity use, the internal heat of cordless electric wrenches can easily lead to air pressure imbalance, affecting the stability of the transmission components. Over time, this can lead to problems such as tool leakage and insufficient torque.

[0003] In view of this, a new type of rechargeable electric wrench that is easy to maintain and can balance internal air pressure is proposed. Utility Model Content

[0004] To address the technical problems of complex lubrication and maintenance and internal pressure imbalance in rechargeable electric wrenches, this utility model provides a novel rechargeable electric wrench.

[0005] This utility model is achieved using the following technical solution: A novel rechargeable electric wrench includes an impact assembly and a motor assembly. A head shell is provided on the outer side of the impact assembly. A middle cover is connected to the side of the head shell near the motor assembly. A gearbox assembly is installed on the inner side of the middle cover and is connected to the impact assembly. Two vent holes are provided on the middle cover, and a wool felt plug is installed on the inner side of each vent hole. A lubricating oil filling mechanism is provided on the upper side of the head shell. A motor drive mechanism is provided on the side of the middle cover away from the impact assembly. A handle control mechanism is provided on the lower side of the middle cover.

[0006] As a further improvement to the above solution, the lubricating oil filling mechanism includes an oil filling hole opened on the upper side of the head shell, an oil filling bolt threaded into the inner side of the oil filling hole, an O-ring provided between the oil filling bolt and the oil filling hole, and the oil filling hole communicating with the gearbox assembly.

[0007] As a further improvement to the above solution, the motor drive mechanism includes a stator housing assembly mounted on the side of the intermediate cover away from the impact assembly, a rear cover fixedly connected to one side of the stator housing assembly, the motor assembly mounted on the inner side of the rear cover, the motor assembly cooperating with the stator housing assembly, and the motor assembly connected to the gearbox assembly.

[0008] As a further improvement to the above solution, the handle control mechanism includes a handle assembly that is fixedly connected to the lower side of the middle cover and the rear cover. A switch is installed on the handle assembly, and the switch is electrically connected to the motor assembly.

[0009] As a further improvement to the above scheme, the number of wool felt plugs is two.

[0010] As a further improvement to the above solution, the vent is located at the end of the middle cover, and there is a gap between the oil filling hole and the vent.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model allows for direct injection of lubricating oil through the oil filling hole on the head shell, eliminating the need to disassemble the outer shell and reducing maintenance time by more than 60%, thus offering the advantage of convenient maintenance.

[0013] 2. This utility model features two vent holes on the middle cover. When the impact component moves and generates heat that cannot be dissipated, it can be released through the vent holes to achieve a heat dissipation effect. The wool felt filter membrane is made of wool felt material, which can prevent internal grease leakage and prevent external dust from entering. By effectively regulating the internal air pressure, pressure balance is achieved, avoiding heat accumulation that could lead to seal failure. With regular lubrication, wear on transmission components can be reduced, extending the service life of the rechargeable electric wrench by approximately 30%. Attached Figure Description

[0014] Figure 1 A cross-sectional view of a novel rechargeable electric wrench provided by this utility model;

[0015] Figure 2 for Figure 1 Schematic diagram of the structure of the O-ring and the filler bolt;

[0016] Figure 3 for Figure 1 A schematic diagram of the structure of the wool felt plug and the middle cover.

[0017] Explanation of key symbols:

[0018] 1. Impact assembly; 2. Head shell; 3. Oiling bolt; 4. O-ring; 5. Intermediate cover; 6. Wool felt plug; 7. Stator housing assembly; 8. Motor assembly; 9. Rear cover; 10. Handle assembly; 11. Switch. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0020] Example:

[0021] Please combine Figures 1-3 This embodiment of a novel rechargeable electric wrench includes an impact assembly 1 and a motor assembly 8. In this embodiment, the motor assembly 8 typically uses a brushless motor, which has the advantages of longer life and higher efficiency, with a rotation speed of 2000-8000 rpm and high torque output efficiency.

[0022] The impact assembly 1 has a head shell 2 on its outer side. The head shell 2 is connected to the middle cover 5 on the side near the motor assembly 8. The head shell 2 and the middle cover 5 are designed to be detachable.

[0023] Please combine Figure 1 As shown, a gearbox assembly is installed on the inner side of the middle cover 5. The gearbox assembly converts the high-speed rotation of the motor into high torque output. It is a common planetary gear structure with a reduction ratio of 10:1 or higher. The gearbox assembly is connected to the impact assembly 1, that is, the impact assembly 1 is driven to move through the gearbox assembly.

[0024] In this embodiment, the intermediate cover 5 has two vent holes arranged in a circular array. Each vent hole has a felt plug 6 installed inside it. The felt plug 6 is made of felt to prevent lubricant leakage and the entry of external dust. When the impact assembly 1 moves, if the heat generated by the gearbox assembly cannot be dissipated in time, the vent holes can be used for heat dissipation.

[0025] Please combine Figure 1 As shown, a lubricating oil filling mechanism is provided on the upper side of the head shell 2, a motor drive mechanism is provided on the side of the middle cover 5 away from the impact component 1, and a handle control mechanism is provided on the lower side of the middle cover 5.

[0026] Please combine Figure 1 and Figure 2 As shown, the lubricating oil filling mechanism includes an oil filling hole on the upper side of the head shell 2. An oil filling bolt 3 is threaded onto the inner side of the oil filling hole. An O-ring 4 is provided between the oil filling bolt 3 and the oil filling hole. The oil filling hole is connected to the gearbox assembly. In this utility model, the O-ring 4 is made of fluororubber, which has better high temperature resistance than silicone rubber and excellent weather resistance, ozone resistance and chemical resistance. It is resistant to most oils and solvents, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oils. The operating temperature range is -20℃ to 250℃, and it can provide a good sealing effect for lubricating oil.

[0027] Please combine Figure 1As shown, the motor drive mechanism includes a stator housing assembly 7 installed on the side of the intermediate cover 5 away from the impact assembly 1. To ensure that the motor does not vibrate when running at high speed, the internal stator needs to be limited. Stable high-speed operation of the motor helps to reduce vibration and extend the life of the electric wrench. A rear cover 9 is fixedly connected to one side of the stator housing assembly 7. The rear cover 9 is made of engineering plastic and is fixed by bolts. It is a detachable design. The motor assembly 8 is installed inside the rear cover 9. The motor assembly 8 is configured to cooperate with the stator housing assembly 7 and is connected to the gearbox assembly.

[0028] Please combine Figure 1 As shown, the handle control mechanism includes a handle assembly 10 that is fixedly connected to the lower side of the middle cover 5 and the rear cover 9. A switch 11 is installed on the handle assembly 10. The switch 11 is electrically connected to the motor assembly 8. By turning the switch 11 on and off, the motor assembly 8 can be controlled to switch on and off. The switch 11 can adjust the speed and direction.

[0029] Please combine Figure 3 As shown, there are two wool felt plugs 6. The wool felt plugs 6 can be used for air exchange and heat dissipation, while preventing the internal lubricating oil from overflowing. When the internal impact component and gearbox component operate at high speed and generate heat, causing the internal air pressure to rise, the internal air pressure can be effectively regulated through the exhaust port to avoid heat accumulation leading to seal failure.

[0030] Please combine Figure 1 As shown, the vent is located at the end of the middle cover 5. There is a gap between the oil filling hole and the vent. By maintaining a certain distance between the oil filling hole and the vent, the high-intensity stress area at the impact component and gearbox component can be avoided. This design can reduce stress concentration, achieve synergistic effect, reduce wear of transmission components, and extend the service life of the rechargeable electric wrench.

[0031] The implementation principle of a novel rechargeable electric wrench in this application embodiment is as follows: An oil filling hole with an oil filling bolt 3 is provided at the front end of the top of the head shell 2. The hole connects to the impact assembly 1. The oil filling bolt 3 uses a threaded tightening structure with an O-ring 4 to prevent lubricating oil leakage. Exhaust holes are located at the upper and lower ends of the middle cover 5, and each exhaust hole has a filter membrane inside. The filter membrane is a wool felt plug 6, connecting the internal transmission structure to the external environment. When the heat generated by the impact assembly 1 during movement cannot be dissipated, it can be cooled through the exhaust hole. The filter membrane is made of wool felt, which can prevent internal lubricating oil leakage and prevent external dust from entering. Furthermore, the distribution of the oil filling hole and exhaust hole should avoid high-intensity stress areas, preferably using an asymmetrical design to reduce stress concentration. By adding oil filling holes and exhaust holes, the lubrication and maintenance process is simplified, and internal air pressure dynamic balance is achieved. The oil filling hole is equipped with an oil filling bolt 3, allowing direct injection of lubricating oil. The exhaust hole is covered with a high-temperature resistant wool felt plug 6 filter membrane to prevent dust intrusion. This design can significantly extend the life of the transmission components and is suitable for high-intensity operation scenarios such as railway and automobile repair.

[0032] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A novel rechargeable electric wrench, comprising an impact assembly (1) and a motor assembly (8), characterized in that, The impact assembly (1) has a head shell (2) on its outer side. The head shell (2) is connected to a middle cover (5) on the side near the motor assembly (8). A gearbox assembly is installed on the inner side of the middle cover (5). The gearbox assembly is connected to the impact assembly (1). The middle cover (5) has two vent holes. A wool felt plug (6) is installed on the inner side of each vent hole. A lubricating oil filling mechanism is provided on the upper side of the head shell (2). A motor drive mechanism is provided on the side of the middle cover (5) away from the impact assembly (1). A handle control mechanism is provided on the lower side of the middle cover (5).

2. The novel rechargeable electric wrench as described in claim 1, characterized in that, The lubricating oil filling mechanism includes an oil filling hole on the upper side of the head shell (2), an oil filling bolt (3) is threaded onto the inner side of the oil filling hole, an O-ring (4) is provided between the oil filling bolt (3) and the oil filling hole, and the oil filling hole is connected to the gearbox assembly.

3. The novel rechargeable electric wrench as described in claim 1, characterized in that, The motor drive mechanism includes a stator housing assembly (7) mounted on the side of the intermediate cover (5) away from the impact assembly (1), a rear cover (9) fixedly connected to one side of the stator housing assembly (7), a motor assembly (8) mounted on the inner side of the rear cover (9), the motor assembly (8) cooperating with the stator housing assembly (7), and the motor assembly (8) connected to the gearbox assembly.

4. A novel rechargeable electric wrench as described in claim 3, characterized in that, The handle control mechanism includes a handle assembly (10) that is fixedly connected to the lower side of the middle cover (5) and the rear cover (9). A switch (11) is installed on the handle assembly (10), and the switch (11) is electrically connected to the motor assembly (8).

5. A novel rechargeable electric wrench as described in claim 1, characterized in that, The number of wool felt plugs (6) is 2.

6. A novel rechargeable electric wrench as described in claim 2, characterized in that, The vent is located at the end of the middle cover (5), and there is a gap between the oil filling hole and the vent.

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