Double-heat-insulation electric wrench
The double insulation mechanism in electric wrenches reduces heat transfer from the striking block to the handle, ensuring comfortable and prolonged operation by incorporating a heat-resistant pad and sleeve.
Patent Information
- Application Number
- CN202422367035.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-27
AI Technical Summary
Electric power tools, such as electric wrenches, generate heat at the contact point between the striking block and the outer shaft due to continuous operation, causing the handle to become increasingly hot and uncomfortable for the user during prolonged use.
The design incorporates a double insulation mechanism with a heat-resistant pad in the handle and a heat-resistant sleeve to reduce heat transfer from the outer shaft to the handle, featuring a heat-resistant pad and sleeve to minimize heat conduction.
The double insulation effectively reduces heat transfer, allowing for prolonged continuous operation without discomfort to the user by maintaining a cooler handle temperature.
Smart Images
Figure CN223099091U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electric wrenches, and particularly relates to a double-insulated electric wrench. Background Art
[0002] The electric wrench is one of the products with large sales volume in the electric tool industry and is widely used in industries such as construction, decoration, and automotive repair, mainly for the disassembly and assembly of bolts.
[0003] The working principle of the electric wrench is as follows: The inner shaft connected to the motor drives the striking block, the striking block drives the outer shaft, and the outer shaft drives the bolt sleeve, so as to disassemble and assemble the bolt. When implemented in a specific structure, an outer shaft bushing needs to be arranged in the head shell. The outer shaft passes through the outer shaft bushing, with its front end extending out of the outer shaft bushing and to the outside of the head shell, and the rear end remaining inside the head shell. A rotating convex block is provided at the rear end. A striking block is sleeved on the inner shaft. A spring is connected to the rear end of the striking block, and spaced striking convex blocks are provided at the front end.
[0004] During the process of tightening the bolt, before it is completely tightened, the rotating convex block engages with the striking convex block. When the striking block rotates, it will drive the outer shaft to rotate synchronously, and then gradually unscrew the bolt. When the bolt is tightened, it is difficult for the bolt sleeve to drive the bolt any further, and the outer shaft stops rotating. Due to the existence of the spring, when the striking convex block contacts the rotating convex block again, it will cause the striking block to retreat but still pass through the rotating convex block, manifested as the striking convex block continuously hitting the rotating convex block, thereby tightening the bolt more tightly. During the process of loosening the bolt, at first, the striking convex block continuously hits the rotating convex block from the opposite direction until the bolt is loosened to the extent that it can be driven by the bolt sleeve. Then, the striking convex block engages with the rotating convex block, and when the striking block rotates, it will drive the outer shaft to rotate synchronously, and then gradually unscrew the bolt.
[0005] Therefore, when using an electric wrench to disassemble and assemble bolts, the striking convex block on the striking block needs to rub against the rotating convex block when hitting it. Each time it rubs, heat is generated. When continuously disassembling and assembling bolts, the heat generated at the contact between the striking block and the outer shaft will be transferred to the head shell, and the user will be scalded by the increasingly hot head shell when holding it. Content of the Utility Model
[0006] The purpose of the utility model is to provide a double-insulated electric wrench to solve the technical problem that when continuously disassembling and assembling bolts with an electric wrench, the heat generated at the contact between the striking block and the outer shaft will be transferred to the head shell, and the user will be scalded by the increasingly hot head shell when holding it.
[0007] To solve the above technical problems, the present utility model provides a double-insulated electric wrench, comprising: a head shell connected to a gear box shell; an outer shaft sleeve accommodating groove formed in the front wall of the head shell to accommodate an outer shaft sleeve; a heat-insulating gasket accommodating groove formed in the inner wall of the front part of the head shell and surrounding the outer shaft sleeve accommodating groove; a heat-insulating gasket disposed in the heat-insulating gasket accommodating groove and protruding from the outer shaft sleeve to abut against a gasket at the rear end of the outer shaft, so as to separate the gasket at the rear end of the outer shaft from the outer shaft sleeve; and a heat-insulating sleeve sleeved on the surface of the head shell.
[0008] Further, the front end of the heat-insulating sleeve extends beyond the outer shaft sleeve; the rear end of the heat-insulating sleeve is located between the gasket at the rear end of the outer shaft and the rear end of the head shell.
[0009] Further, the ratio of the horizontal distance L1 between the front end and the rear end of the heat-insulating sleeve to the horizontal distance L2 between the front end and the rear end of the head shell is 18-22:35-40.
[0010] Further, the ratio of the horizontal distance L1 between the front end and the rear end of the heat-insulating sleeve to the horizontal distance L2 between the front end and the rear end of the head shell is 39:75.
[0011] Further, a first sealing ring accommodating groove is formed in the inner wall of the head shell in front of the outer shaft sleeve accommodating groove; a second sealing ring accommodating groove is formed in the abutting surface between the gear box shell and the head shell; a first sealing ring is disposed in the first sealing ring accommodating groove, a second sealing ring is disposed in the second sealing ring accommodating groove, and a bearing and a third sealing ring are sleeved on the transmission shaft extending into the gear box shell to seal the head shell cavity formed by the head shell and the gear box shell.
[0012] Further, the first sealing ring is a lip-shaped sealing ring; the second sealing ring is an O-shaped sealing ring; the third sealing ring is an annular sealing ring.
[0013] Further, a plurality of head shell convex parts are arranged at intervals on the surface of the head shell; a plurality of box shell convex parts corresponding to the head shell convex parts are arranged at intervals on the surface of the gear box shell and are adapted to be aligned with the corresponding head shell convex parts when the head shell and the gear box shell are butted; threaded holes are formed in both the head shell convex parts and the box shell convex parts.
[0014] The beneficial effects of the present utility model are as follows. The present utility model aims to solve the technical problem that when a power wrench continuously disassembles and assembles bolts, the heat generated at the contact between the striking block and the outer shaft is transferred to the head shell, and the user will be scalded by the increasingly hot head shell when holding it. On the inner wall of the head shell of this double-insulated power wrench, there is a heat-insulating gasket accommodating groove surrounding the outer shaft sleeve accommodating groove. A heat-insulating gasket is arranged in the heat-insulating gasket accommodating groove, and the heat-insulating gasket protrudes from the outer shaft sleeve, which can separate the outer shaft sleeve from the gasket at the rear end of the outer shaft. When continuously disassembling and assembling bolts, after the heat generated at the contact between the striking block and the outer shaft is transferred to the gasket at the rear end of the outer shaft, the efficiency of transferring to the outer shaft sleeve is greatly reduced. Furthermore, the efficiency of transferring to the head shell through the outer shaft sleeve is also reduced. On the one hand, it makes the head shell heat up more slowly. On the other hand, this double-insulated power wrench is sleeved with a heat-insulating sleeve on the surface of the head shell, which can further extend the duration of continuously disassembling and assembling bolts long enough for the user to feel that the heat-insulating sleeve also becomes warm, thereby ensuring that this double-insulated power wrench can continuously disassemble and assemble bolts for a quite long time without scalding the user. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the specific embodiments or the prior description. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0016] Figure 1 is the cross-section of the double-insulated power wrench of the present utility model Figure 1 ;
[0017] Figure 2 is Figure 1 the enlarged view of part A in
[0018] Figure 3 is the cross-section of the double-insulated power wrench of the present utility model Figure 2 ;
[0019] Figure 4 is the structural schematic diagram of the double-insulated power wrench of the present utility model Figure 1 ;
[0020] Figure 5 is the structural schematic diagram of the double-insulated power wrench of the present utility model Figure 2 ;
[0021] In the figure:
[0022] Head shell 100, outer shaft bushing accommodation groove 110, heat insulation gasket accommodation groove 120, first sealing ring accommodation groove 130, head shell convex portion 140, gearbox shell 200, second sealing ring accommodation groove 210, box shell convex portion 220, outer shaft bushing 300, heat insulation gasket 400, outer shaft rear end gasket 500, heat insulation sleeve 600, first sealing ring 710, second sealing ring 720, bearing 730, third sealing ring 740, transmission shaft 800, head shell cavity 900. Detailed implementation mode
[0023] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0024] Embodiment
[0025] As Figure 1 shown, the present utility model provides a double heat insulation electric wrench, including: a head shell 100, which is connected to a gearbox shell 200; combined Figure 2 , an outer shaft bushing accommodation groove 110, which is opened on the front inner wall of the head shell 100 to accommodate an outer shaft bushing 300; a heat insulation gasket accommodation groove 120, which is opened on the front inner wall of the head shell 100 and surrounds the outer shaft bushing accommodation groove 110; a heat insulation gasket 400, which is arranged in the heat insulation gasket accommodation groove 120 and protrudes from the outer shaft bushing 300 to abut against an outer shaft rear end gasket 500, so as to separate the outer shaft rear end gasket 500 from the outer shaft bushing 300; a heat insulation sleeve 600, which is sleeved on the surface of the head shell 100.
[0026] On the inner wall of the head shell 100 of this double heat insulation electric wrench, there is a heat insulation gasket accommodation groove 120 surrounding the outer shaft bushing accommodation groove 110. A heat insulation gasket 400 is arranged in the heat insulation gasket accommodation groove 120, and the heat insulation gasket 400 protrudes from the outer shaft bushing 300, which can separate the outer shaft bushing 300 from the outer shaft rear end gasket 500. When continuously disassembling and assembling bolts, after the heat generated at the contact point between the striking block and the outer shaft is transferred to the outer shaft rear end gasket 500, the efficiency of being transferred to the outer shaft bushing 300 is greatly reduced. Furthermore, the efficiency of being transferred to the head shell through the outer shaft bushing 300 is also reduced. On the one hand, it makes the head shell 100 heat up more slowly. On the other hand, this double heat insulation electric wrench is sleeved with a heat insulation sleeve 600 on the surface of the head shell 100, which can further extend the duration of continuously disassembling and assembling bolts long enough for the user to feel that the heat insulation sleeve 600 also becomes warm, so as to ensure that this double heat insulation electric wrench can continuously disassemble and assemble bolts for a quite long time without scalding the user.
[0027] In at least one embodiment, the heat insulation gasket 400 may, but is not limited to, be a plastic gasket, and the heat insulation sleeve 600 may, but is not limited to, be a rubber sleeve.
[0028] Reference Figure 3 , the front end of the heat insulation sleeve 600 extends beyond the outer shaft sleeve 300; the rear end of the heat insulation sleeve 600 is located between the outer shaft rear gasket 500 and the rear end of the head shell 100. By allowing the heat insulation sleeve 600 to only partially cover the head shell 100, a certain heat dissipation surface can be ensured for the head shell 100.
[0029] Reference Figure 3 , the ratio of the horizontal distance L1 between the front end and the rear end of the heat insulation sleeve 600 to the horizontal distance L2 between the front end and the rear end of the head shell 100 is 18 - 22:35 - 40.
[0030] In at least one embodiment, the ratio of the horizontal distance L1 between the front end and the rear end of the heat insulation sleeve 600 to the horizontal distance L2 between the front end and the rear end of the head shell 100 is 39:75, which is the optimal ratio for balancing the user's grip and the heat dissipation area of the head shell 100.
[0031] As Figure 2 shown, a first sealing ring receiving groove 130 is formed on the inner wall of the head shell 100 in front of the outer shaft sleeve receiving groove 110; in combination with Figure 3 and Figure 1 , a second sealing ring receiving groove 210 is formed on the abutting surface between the gearbox housing 200 and the head shell 100; a first sealing ring 710 is provided in the first sealing ring receiving groove 130, a second sealing ring 720 is provided in the second sealing ring receiving groove 210, and a bearing 730 and a third sealing ring 740 are sleeved on the transmission shaft 800 extending into the gearbox housing 200, so as to seal the head shell cavity 900 formed by the head shell 100 and the gearbox housing 200, and thus oil can be filled in the head shell cavity 900.
[0032] In at least one embodiment, the first sealing ring 710 is preferably a lip seal; the second sealing ring 720 is preferably an O - ring seal; the third sealing ring 740 is preferably a woolen ring, so as to ensure the sealing performance and prevent oil leakage, resulting in the problem of dry grinding due to oil loss.
[0033] As Figure 4 and Figure 5 shown, a plurality of head shell protrusions 140 are spaced on the surface of the head shell 100; a plurality of box shell protrusions 220 corresponding to the head shell protrusions 140 are spaced on the surface of the gearbox housing 200, and are adapted to align with the corresponding head shell protrusions 140 when the head shell 100 and the gearbox housing 200 are docked; threaded holes are formed in both the head shell protrusions 140 and the box shell protrusions 220.
[0034] In at least one embodiment, there are four head shell convex parts 140 and also four gearbox shell convex parts 220. The head shell convex parts 140 are arranged in the area of the head shell 100 that is not covered by the heat insulation sleeve 600. Both the head shell convex parts 140 and the gearbox shell convex parts 220 can protrude outwards, so as to set threaded holes, and the head shell 100 and the gearbox shell 200 can be fixedly connected by bolts.
[0035] In summary, for the dual-insulation electric wrench provided by the present utility model, a heat insulation gasket accommodating groove 120 surrounding the outer shaft bushing accommodating groove 110 is formed on the inner wall of the head shell 100. A heat insulation gasket 400 is arranged in the heat insulation gasket accommodating groove 120, and the heat insulation gasket 400 protrudes out of the outer shaft bushing 300, which can separate the outer shaft bushing 300 from the outer shaft rear-end gasket 500. When continuously disassembling and assembling bolts, after the heat generated at the contact between the striking block and the outer shaft is transferred to the outer shaft rear-end gasket 500, the efficiency of being transferred to the outer shaft bushing 300 is greatly reduced. Furthermore, the efficiency of being transferred to the head shell through the outer shaft bushing 300 is also reduced. On the one hand, the temperature rise of the head shell 100 becomes slower. On the other hand, the dual-insulation electric wrench of the present utility model is sleeved with a heat insulation sleeve 600 on the surface of the head shell 100, which can further extend the duration of continuously disassembling and assembling bolts long enough for the user to feel that the heat insulation sleeve 600 also becomes warm, so as to ensure that the dual-insulation electric wrench of the present utility model can continuously disassemble and assemble bolts for a quite long time without scalding the user.
[0036] In the embodiments provided in the present application, it should be understood that the disclosed systems and devices can be implemented in other ways. The above-described embodiments are only illustrative. For example, the division of the mechanisms is only a logical function division, and there can be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
[0037] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0038] Inspired by the above-described ideal embodiments of the present utility model, through the above description, those skilled in the relevant art can make various changes and modifications without departing from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A double-insulated electric wrench, characterized in that, Comprising: A head shell (100) connected to a gearbox shell (200); An outer shaft bushing receiving groove (110) formed on the inner wall of the front part of the head shell (100) for receiving an outer shaft bushing (300); A heat insulation gasket receiving groove (120) formed on the inner wall of the front part of the head shell (100) and surrounding the outer shaft bushing receiving groove (110); A heat insulation gasket (400) disposed in the heat insulation gasket receiving groove (120) and protruding beyond the outer shaft bushing (300) to abut against an outer shaft rear end gasket (500), separating the outer shaft rear end gasket (500) from the outer shaft bushing (300); A heat insulation sleeve (600) sleeved on the surface of the head shell (100).
2. The double heat insulation electric wrench according to claim 1, characterized in that The front end of the heat insulation sleeve (600) extends beyond the outer shaft bushing (300); The rear end of the heat insulation sleeve (600) is located between the outer shaft rear end gasket (500) and the rear end of the head shell (100).
3. The double heat insulation electric wrench according to claim 2, characterized in that The ratio of the horizontal distance L1 between the front end and the rear end of the heat insulation sleeve (600) to the horizontal distance L2 between the front end and the rear end of the head shell (100) is 18 - 22:35 - 40.
4. The double heat insulation electric wrench according to claim 3, characterized in that The ratio of the horizontal distance L1 between the front end and the rear end of the heat insulation sleeve (600) to the horizontal distance L2 between the front end and the rear end of the head shell (100) is 39:
75.
5. The double heat insulation electric wrench according to claim 1, characterized in that A first seal ring receiving groove (130) is formed on the inner wall of the head shell (100) in front of the outer shaft bushing receiving groove (110); A second seal ring receiving groove (210) is formed on the abutting surface of the gearbox shell (200) and the head shell (100); A first seal ring (710) is provided in the first seal ring receiving groove (130), a second seal ring (720) is provided in the second seal ring receiving groove (210), and a bearing (730) and a third seal ring (740) are sleeved on a transmission shaft (800) extending into the gearbox shell (200) to seal a head shell cavity (900) formed by the head shell (100) and the gearbox shell (200).
6. The double heat insulation electric wrench according to claim 5, characterized in that The first seal ring (710) is a lip seal ring; The second seal ring (720) is an O - ring seal; The third seal ring (740) is an annular seal ring.
7. The double heat insulation electric wrench according to claim 5, characterized in that A plurality of head shell protrusions (140) are spaced on the surface of the head shell (100); A plurality of box shell protrusions (220) corresponding to the head shell protrusions (140) are spaced on the surface of the gearbox shell (200), adapted to be aligned with the corresponding head shell protrusions (140) when the head shell (100) and the gearbox shell (200) are docked. Threaded holes are formed in both the head shell convex portion (140) and the box shell convex portion (220).