A power tool

Abstract

This application discloses a power tool comprising a main body housing, a yoke housing, a gearbox housing, and a retainer. The yoke housing is located near the main body housing with one end extending into the inner side of the main body housing. The gearbox housing is disposed inside the main body housing. The retainer is located near the gearbox housing and at least partially extends into the inner side of the gearbox housing. The overlapping areas of the main body housing, yoke housing, gearbox housing, and retainer are fastened by a first fastener and a second fastener. During fastening, the end of the first fastener passes through the main body housing and locks into the yoke housing or gearbox housing, while the second fastener passes through the yoke housing and gearbox housing and locks into the retainer, forming a multi-point fastening system that effectively prevents loosening or displacement of components under high load or vibration conditions.

Description

Technical Field

[0001] This application relates to the field of mechanical structures, and in particular to an electric tool. Background Technology

[0002] Power tools (such as electric ratchet wrenches and electric screwdrivers) typically consist of a main body housing, gearbox housing, motor, and transmission mechanism. The assembly method and connection structure of these components directly affect the tool's stability, durability, and performance. In traditional power tools, the components are usually individually fixed together by multiple fasteners, resulting in a complex structure, low assembly efficiency, and a tendency to loosen or shift under long-term high-load use, affecting transmission accuracy and tool life.

[0003] In the prior art, the gearbox housing and the main body shell are usually connected by simple bolts, which can easily cause relative rotation under vibration or impact loads, leading to poor gear meshing or component wear. Utility Model Content

[0004] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the existing technology and provide an electric tool.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A power tool, comprising:

[0007] Main body shell;

[0008] The gearbox housing is located inside the main body shell;

[0009] A cage, which is close to the gearbox housing and at least partially extends into the inside of the gearbox housing;

[0010] The yoke housing is close to the main housing and one end extends into the inside of the main housing;

[0011] In the longitudinal section, the main body shell, the yoke shell, the gearbox shell, and the cage overlap at least partially;

[0012] The overlapping area is secured by a first fastener and a second fastener, the first fastener passing through the main body housing and locking into the yoke housing or gearbox housing;

[0013] The second fastener passes through the yoke housing and gearbox housing and locks into the cage;

[0014] The end of the yoke shell that extends into the inner side of the main shell is engaged with the gearbox shell by a limiting mechanism.

[0015] Furthermore, in the yoke housing and the gearbox housing, one is provided with a limiting protrusion, and the other is provided with a limiting groove that matches the limiting protrusion. When one end of the yoke housing extends into the inner side of the main housing, the limiting groove engages with the limiting protrusion, so that the yoke housing and the gearbox housing are mutually circumferentially limited. The matching limiting groove and the limiting protrusion are constructed as a limiting mechanism.

[0016] Furthermore, the limiting groove is an open groove, with the opening of the limiting groove facing the main body shell.

[0017] Furthermore, there are multiple first fasteners arranged circumferentially on the main body shell.

[0018] Furthermore, there are multiple second fasteners arranged circumferentially on the yoke housing.

[0019] Furthermore, the end of the first fastener passes through the main body housing and extends to the limiting groove to lock and fix it to the limiting protrusion on the gearbox housing.

[0020] Furthermore, the end of the first fastener passes through the main body housing and is locked and fixed to the yoke housing or gearbox housing.

[0021] Furthermore, the power tool also includes:

[0022] A battery unit, which is inserted into the main body housing;

[0023] The motor is electrically connected to the battery cell;

[0024] The gear assembly is housed within the gearbox housing and is poweredly connected to the motor shaft of the motor.

[0025] The bearing is mounted on a cage and fitted onto the outside of the motor shaft;

[0026] An eccentric shaft is housed within the yoke housing and connected to the power output end of the gear assembly.

[0027] A ratchet assembly that connects to the end of an eccentric shaft.

[0028] Furthermore, both the first and second fasteners are bolts.

[0029] Furthermore, the second fastener installed on the yoke housing is covered inside the main body housing.

[0030] The beneficial effects of this utility model are as follows: 1. In the longitudinal section, the main body shell, yoke shell, gearbox shell, and cage adopt a partially overlapping design and are fastened by the first and second fasteners, reducing redundant layout of parts and making the overall structure more compact. At the same time, the setting of the limiting mechanism enables the yoke shell and gearbox shell to be quickly aligned, improving assembly efficiency.

[0031] 2. The first fastener passes through the main body housing and locks into the yoke housing or gearbox housing, while the second fastener passes through both the yoke housing and gearbox housing and locks into the retainer, forming a multi-point fastening system that effectively prevents loosening or displacement of components under high load or vibration conditions. Furthermore, the limiting mechanism (such as the engagement of a limiting protrusion and a limiting groove) further enhances the circumferential limiting capability between the yoke housing and the gearbox housing, preventing relative rotation and ensuring transmission stability. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the power tool used in this application.

[0034] Figure 2 This is a front view of the power tool of this application.

[0035] Figure 3 for Figure 2 A schematic diagram of the cross section along line AA.

[0036] Figure 4 This is a partial structural diagram of the power tool of this application.

[0037] Figure 5 This is a partial exploded view of the power tool structure of this application.

[0038] Figure 6 for Figure 4 A cross-sectional schematic diagram.

[0039] Figure 7 This is a schematic diagram of the ratchet assembly of this application.

[0040] Figure 8 This is a front view of the ratchet assembly of this application.

[0041] Figure 9 for Figure 8 A schematic diagram of the cross section along line BB. Detailed Implementation

[0042] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0043] Reference Figure 1 , Figure 2 , Figure 3 An electric tool 100 includes a main body housing 10, a yoke housing 20, a gearbox housing 30, and a retainer 40. The yoke housing 20 is close to the main body housing 10 and one end extends into the inside of the main body housing 10. The gearbox housing 30 is disposed inside the main body housing 10. The retainer 40 is close to the gearbox housing 30 and at least partially extends into the inside of the gearbox housing 30.

[0044] Additionally, refer to Figure 4 , Figure 6 A battery unit, which is a battery pack, is inserted into one end of the main body shell 10. The battery pack is inserted into the battery pack mounting part 101 on the main body shell 10. A motor 50 is provided inside the main body shell 10, and the motor 50 is electrically connected to the battery pack. A gear assembly 60 is provided inside the gearbox shell 30. The power input end of the gear assembly 60 is poweredly connected to the motor shaft 501 of the motor 50. The power output end of the gear assembly 60 is connected to an eccentric shaft 70. The eccentric shaft 70 is installed inside the yoke shell 20. The end of the eccentric shaft 70 away from the gear assembly 60 is connected to a ratchet assembly 80. The end of the yoke shell 20 has a head shell 90, and the ratchet assembly 80 is installed inside the head shell 90.

[0045] Furthermore, refer to Figure 7 , Figure 8 , Figure 9 The ratchet assembly 80 includes a ratchet ring 801, a drive head 802, a pawl 803, and a reversing knob 804. The ratchet ring 801 is an annular structure, rotatably supported within the head housing 90. One end of the ratchet ring 801 forms a transmission fork 8011. The upper eccentric portion of the eccentric shaft 70 is inserted into the transmission fork 8011 via a bushing 701. The eccentric shaft 70, driven by the motor 50, rotates, thus driving the ratchet ring 801 to swing left and right within the head housing 90. The ratchet ring 801 has an inner annular surface on which an internal gear ring 8012 is formed. The internal gear ring 8012 engages with the pawl 803 when the power tool 100 is in the forward working stroke, thereby causing the ratchet ring 801 to drive the drive head 802 to rotate synchronously.

[0046] The drive head 802 is housed within the internal gear ring 8012 and is rotatably supported by the head shell 90. The drive head 802 is generally cylindrical, and a working square head 805 for outputting power can be formed on one end face. A mounting groove 806 for mounting a pawl 803 can also be formed on one side of the drive head 802. The mounting groove 806 is generally fan-shaped. The pawl 803 is pivotally mounted in the mounting groove 806 via a pin 807. The pawl 803 can swing left and right within the space of the mounting groove 806. On both sides of the pawl 803, ratchet portions 8031 ​​that can engage with the internal gear ring 8012 are formed. The ratchet portions 8031 ​​can engage with the internal gear ring 8012, thereby driving the drive head 802 to rotate with the ratchet ring 801 by the pawl 803. Before the ratchet 8031 ​​engages with the internal gear ring 8012, a biasing force needs to be applied to it by the reversing knob 804 so that the ratchet 8031 ​​is pre-pressed onto the internal gear ring 8012 so that it can engage with it when the ratchet ring 801 swings. The reversing knob 804 rotates around its own axis under the drive of an external force and applies a biasing force to the ratchet 8031 ​​on either side of the pawl 803.

[0047] The reversing knob 804 includes a drive part 8041, a stop part 8042, and a spring part 8043. The upper end of the drive part 8041 is an operating plate for the user to apply force to rotate it, and the lower end of the drive part 8041 is a cylindrical structure for insertion into the mounting hole of the drive head 802. A insertion hole 8044 is formed on the lower side wall of the drive part 8041, and the spring part 8043 is inserted into the insertion hole 8044. The spring part 8043 can specifically be a compression spring. Since the insertion hole 8044 can communicate with the mounting slot 806, one end of the stop part 8042 can be connected to the spring part 8043, and the other end can abut against the pawl 803. When the user operates the drive unit 8041, causing the abutment part 8042 to abut against one side of the pawl 803, the reversing knob 804 applies a biasing force to the ratchet part 8031 ​​on that side, allowing it to preload onto the internal gear ring 8012. At this time, the electric ratchet wrench (power tool) can only output power in one direction. If the user operates the drive unit 8041, causing the abutment part 8042 to abut against the other side of the pawl 803, the electric ratchet wrench can only output power in the opposite direction.

[0048] In this embodiment, refer to Figures 3 to 6Since the tool head installed at the end of the power tool 100 is a ratchet assembly 80, the power tool 100 in this embodiment is an electric ratchet wrench. After the electric ratchet wrench is assembled, the motor 50 is located inside the main body housing 10. The motor shaft 501 of the motor 50 is powered by the gear assembly 60. The gear assembly 60 drives the eccentric shaft 70 to rotate. When the eccentric shaft 70 rotates, it drives the ratchet ring 801 to swing. The swinging ratchet ring 801 drives the drive head 802 and the working head 805 to output power in one direction. After the power tool 100 is assembled, in the longitudinal section, the main body housing 10, the yoke housing 20, the gearbox housing 30 and the cage 40 overlap at least partially.

[0049] To ensure the robustness of the assembled main body shell 10, yoke shell 20, gearbox shell 30, and cage 40, in this embodiment, the overlapping areas of the main body shell 10, yoke shell 20, gearbox shell 30, and cage 40 are fastened by a first fastener 100a and a second fastener 100b. During fastening, the end of the first fastener 100a passes through the main body shell 10 and locks into the yoke shell 20 or gearbox shell 30, and the second fastener 100b passes through the yoke shell 20 and gearbox shell 30 and locks into the cage 40. The cage 40 can be specifically implemented as a bearing cage, on which a bearing 200 is installed. The bearing 200 is sleeved on the outside of the motor shaft 501 and provides rotational support.

[0050] In addition, the end of the yoke housing 20 that extends into the inner side of the main housing 10 is engaged with the gearbox housing 30 by a limiting mechanism. One of the yoke housing 20 and the gearbox housing 30 is provided with a limiting protrusion, and the other is provided with a limiting groove that matches the limiting protrusion. Specifically, the limiting protrusion 301 is provided on the outer wall of the gearbox housing 30, and the limiting groove 201 is provided at one end of the yoke housing 20. The limiting groove 201 is an open groove. When one end of the yoke housing 20 extends into the inner side of the main housing 10, the limiting groove 201 engages with the limiting protrusion 301, so that the yoke housing 20 and the gearbox housing 30 are mutually circumferentially limited. The matching limiting groove 201 and limiting protrusion 301 are constructed as a limiting mechanism.

[0051] Specifically, in this embodiment, when assembling the main body shell 10, yoke shell 20, gearbox shell 30, and retainer 40, one end of the retainer 40 extends into the gearbox shell 30, and one end of the yoke shell 20 is fitted onto the outside of the gearbox shell 30 and engaged with the limiting protrusion 301 through the limiting groove 201. After the yoke shell 20 and gearbox shell 30 are mutually circumferentially limited, the end of the second fastener 100b passes through the yoke shell 20 and gearbox shell 30 and locks into the retainer 40, so that the yoke shell 20, gearbox shell 30, and retainer 40 are firmly locked. Furthermore, the main body shell 10 is spliced ​​and assembled on the outside of the yoke shell 20. The end of the first fastener 100a passes through the main body shell 10 and extends to the limiting groove 201 to lock and fix with the limiting protrusion 301 on the gearbox shell 30. The main body shell 10 can then be locked and fixed with the yoke shell 20, gearbox shell 30, and retainer 40.

[0052] In this embodiment, there are multiple first fasteners 100a arranged circumferentially on the main body shell 10, and multiple second fasteners 100b arranged circumferentially on the yoke shell 20. The second fasteners 100b installed on the yoke shell 20 are covered inside the main body shell 10. Both the first fasteners 100a and the second fasteners 100b can be implemented as bolts.

[0053] In summary, in the longitudinal section, the main body shell 10, yoke shell 20, gearbox shell 30, and retainer 40 of this application adopt a partially overlapping design and are fastened by the first fastener 100a and the second fastener 100b, reducing redundant component layout and making the overall structure more compact. At the same time, the limiting mechanism allows the yoke shell 20 and gearbox shell 30 to be quickly aligned, improving assembly efficiency.

[0054] The first fastener 100a passes through the main body housing 10 and locks into the yoke housing 20 or gearbox housing 30, while the second fastener 100b passes through both the yoke housing 20 and gearbox housing 30 and locks into the retainer 40, forming a multi-point fastening system that effectively prevents loosening or displacement of components under high load or vibration conditions. Furthermore, the limiting mechanism (such as the engagement of a limiting protrusion and a limiting groove) further enhances the circumferential limiting capability between the yoke housing 20 and the gearbox housing 30, preventing relative rotation and ensuring transmission stability.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electric tool, comprising: Main body shell; Gearbox housing, which is disposed inside the main body housing; A retainer that is close to and at least partially extends into the inside of the gearbox housing; A yoke housing, which is close to the main body housing and has one end extending into the inside of the main body housing; The feature is that, in the longitudinal section, the main body shell, the yoke shell, the gearbox shell, and the cage at least partially overlap; The overlapping area is secured by a first fastener and a second fastener, the first fastener passing through the main body housing and locking into the yoke housing or the gearbox housing; The second fastener passes through the yoke housing and the gearbox housing and locks into the retainer; The end of the yoke housing that extends into the inner side of the main body housing is engaged with the gearbox housing by a limiting mechanism.

2. The power tool according to claim 1, characterized in that, In the yoke housing and the gearbox housing, one is provided with a limiting protrusion, and the other is provided with a limiting groove adapted to the limiting protrusion. When one end of the yoke housing extends into the inner side of the main body housing, the limiting groove engages with the limiting protrusion, so that the yoke housing and the gearbox housing are mutually circumferentially limited. The adapted limiting groove and limiting protrusion are constructed as the limiting mechanism.

3. The power tool according to claim 2, characterized in that, The limiting groove is an open groove, and the opening of the limiting groove faces the main body shell.

4. The power tool according to claim 1, characterized in that, The number of the first fasteners is multiple, and the multiple first fasteners are arranged circumferentially on the main body shell.

5. The power tool according to claim 1, characterized in that, The number of the second fasteners is multiple, and the multiple second fasteners are arranged circumferentially on the yoke housing.

6. The power tool according to claim 2, characterized in that, The end of the first fastener passes through the main body housing and extends to the limiting groove to lock and fix it to the limiting protrusion on the gearbox housing.

7. The power tool according to claim 2, characterized in that, The end of the first fastener passes through the main body housing and is locked and fixed to the yoke housing or the gearbox housing.

8. The power tool according to claim 1, characterized in that, Also includes: A battery unit, which is inserted into the main body housing; A motor, which is electrically connected to the battery cell; A gear assembly is disposed within the gearbox housing and is poweredly connected to the motor shaft of the motor; The bearing is mounted on the cage and sleeved on the outside of the motor shaft; An eccentric shaft is disposed within the yoke housing and connected to the power output end of the gear assembly; A ratchet assembly connected to the end of the eccentric shaft.

9. The power tool according to claim 1, characterized in that, Both the first and second fasteners are bolts.

10. The power tool according to claim 5, characterized in that, The second fastener, mounted on the yoke housing, is covered inside the main housing.

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