A type of openable bevel ring gear right-angle electric wrench head

Abstract

This invention relates to the field of power tool technology and discloses an openable bevel ring gear right-angle electric wrench head, comprising a housing 1 with a side opening, a housing 2, an input shaft passing through the housing 2 and a drive bevel gear at its end, and an openable hollow bevel ring gear rotatably supported within the housing 2, with its axis perpendicular to the input shaft; the upper end face of the bevel ring gear has bevel teeth that mesh with the drive bevel gear, and is formed by a left half gear and a right half gear connected by a hinge, allowing it to open and close laterally to engage or disengage nuts through the side opening, and includes an opening and closing locking mechanism; the inner wall has a polygonal driving surface. This invention designs the right-angle transmission output end as an openable hollow bevel ring gear, suitable for nut assembly and disassembly operations with extra-long bolts and limited axial space, offering flexible operation, smooth transmission, a ball bearing support structure to reduce friction, and a meshing positioning structure to ensure continuous tooth alignment, resulting in strong adaptability.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and more specifically to an openable bevel ring gear right-angle electric wrench head. Background Technology

[0002] In mechanical assembly, equipment maintenance, and pipeline installation, situations frequently arise where there are extra-long bolts (the bolt extending more than 50mm beyond the nut) or severely limited axial space in front of the bolt (e.g., less than 50mm axial distance when close to a wall or equipment). For extra-long bolts, traditional sockets, due to their limited depth, cannot fully accommodate the exposed bolt shank, making it impossible to fit the socket into the nut. In situations with limited space in front, electric wrenches cannot reach along the bolt's axis, making operation difficult.

[0003] While some open-end wrench heads can be inserted into nuts from the side, they mostly employ an integral open-end gear or ratchet structure with a fixed opening size that cannot be opened or closed, resulting in poor adaptability to different nut sizes and difficulty in achieving right-angle transmission. In the prior art, Chinese patent CN223507093U discloses an electric wrench using an open-end gear structure, but its gear is integral with a fixed opening that cannot be adjusted or opened / closed, making it difficult to insert nuts arbitrarily from the side. Chinese patent CN202320735209 discloses an electric open-end wrench suitable for long screws, achieving reversal through a bevel gear set, but its actuator is still an independent sleeve, and the overall axial dimension of the wrench head remains relatively large, failing to adequately adapt to situations with extremely limited front-end space. Chinese patent CN215748901U discloses an electric wrench right-angle converter, which only achieves right-angle rotation; the output end is a traditional shaft-hole plug-in structure, unable to achieve the function of inserting nuts from the side.

[0004] It is evident that there is currently no solution in the technology to design the output end of a right-angle bevel gear transmission as an openable hollow bevel ring gear, which would enable both right-angle power transmission and the opening and closing of the actuator itself to laterally engage the nut. This results in significant limitations on the efficiency and convenience of electric nut removal and installation under special working conditions such as extra-long bolts and limited front-end space. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the shortcomings of existing electric wrenches in simultaneously achieving right-angle transmission and lateral opening and closing to engage nuts under conditions of ultra-long bolts and confined spaces. This invention provides an openable bevel ring gear right-angle electric wrench head, whose output end is an openable hollow bevel ring gear. It can transmit power in right-angle reversal and can also open and close from the side to engage or disengage nuts. It also allows long bolts to pass through freely, making it flexible to operate and transmitting large torque.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A retractable bevel ring gear right-angle electric wrench head includes a housing 1 with a side opening; a housing 2 fixedly connected to the housing 1; an input shaft rotatably passing through the side wall of the housing 2, one end of which is connected to the power output end of a drive source, and the other end extending into the housing 2 and connected to a drive bevel gear; a retractable hollow bevel ring gear, rotatably supported within the housing 2 about its own axis, its axis being perpendicular to the input shaft, the upper end face of the bevel ring gear having bevel teeth, the bevel teeth meshing perpendicularly with the drive bevel gear; the retractable hollow bevel ring gear consists of a left half gear and a right half gear connected by a hinge. The device is designed to open and close laterally to engage or disengage from the nut via the side opening. A locking mechanism is provided on the openable hollow bevel ring gear to lock the left and right halves of the gear in a closed state. The inner wall of the openable hollow bevel ring gear has a polygonal driving surface for directly engaging with the outer circumference of the nut and transmitting torque in the closed state. The center of the openable hollow bevel ring gear has an axial through hole allowing a bolt to pass through. The side opening of the housing is aligned with the opening and closing direction of the openable hollow bevel ring gear to allow the left and right halves of the gear to engage or disengage laterally from the nut via the opening and closing action.

[0008] Furthermore, the polygonal driving surface is hexagonal or dodecagonal. The hexagonal shape can be used with standard hexagonal nuts; the dodecagonal shape is compatible with both hexagonal and dodecagonal nuts, offering greater adaptability.

[0009] Furthermore, the opening and closing locking mechanism is a snap-on locking mechanism, a pin locking mechanism, or an eccentric wheel locking mechanism. These mechanisms have simple structures, reliable locking, and are easy to operate with one hand.

[0010] Furthermore, a positioning structure is provided at the meshing joint of the left and right half gears to ensure that the bevel teeth of the left and right half gears are continuously aligned at the meshing joint in the closed state. The positioning structure ensures that the bevel tooth pitch at the gear meshing joint is continuous, avoiding meshing impact and noise, and improving transmission smoothness.

[0011] Furthermore, the positioning structure consists of a positioning tenon and a groove that fit together. The positioning tenon and groove fit together to achieve precise and repeatable positioning, and the structure is simple and easy to manufacture.

[0012] Furthermore, an annular support ring is provided on the inner wall of the housing, and an annular support groove is provided on the outer periphery of the openable hollow bevel ring gear to mate with the annular support ring to withstand radial and / or axial loads. The engagement of the ring and the support groove effectively supports the bevel ring gear, ensuring stable operation when subjected to the reaction force of a wrench.

[0013] Furthermore, the inner sidewall of the bottom end of the second housing is provided with an annular support ring, and the bottom end of the openable hollow bevel ring gear is provided with an annular support groove that mates with the annular support ring to withstand radial and / or axial loads. The combined action of the upper and lower support rings can further resist the overturning moment generated during tightening and improve the structural rigidity.

[0014] Furthermore, both the sidewall of the first annular support ring and the upper wall of the second annular support ring are embedded with a plurality of rotatable balls. The balls convert sliding friction into rolling friction, reducing the resistance when the bevel ring gear rotates, reducing wear and heat generation, and improving transmission efficiency.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. This invention designs the right-angle transmission output end as an openable hollow bevel ring gear, enabling the wrench head to achieve right-angle power reversal and to be opened and closed from the side to engage or disengage from the nut. This effectively solves the problem of being unable to operate under conditions of ultra-long bolts and extremely limited front axial space, and significantly improves the flexibility and convenience of working in narrow spaces.

[0017] 2. The hollow bevel ring gear of the present invention has an axial through hole in the center that allows bolts to pass freely, and the inner wall is directly machined with a polygonal driving surface. It does not require a traditional deep hole sleeve and can be directly fitted onto the outer circumference of the nut to transmit torque. It is particularly suitable for situations where the bolt is extremely long and the wrench cannot be axially fitted.

[0018] 3. The inner sidewall and the upper bottom wall of the housing of the present invention are respectively provided with annular support ring one and annular support ring two. At the same time, annular support groove one and annular support groove two are opened on the outer periphery and bottom end of the bevel ring gear, which match annular support ring one and annular support ring two. Rotatable balls are embedded in annular support ring one and annular support ring two. This not only provides stable radial and axial support for the bevel ring gear and effectively resists the overturning torque during tightening, but also converts sliding friction into rolling friction, reduces rotational resistance, reduces wear and heat generation, and improves transmission efficiency and operational stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the shell structure one and shell structure two of the present invention;

[0021] Figure 3 This is a schematic diagram of the input shaft, drive bevel gear, and hollow bevel ring gear structure of the present invention;

[0022] Figure 4 For the present invention Figure 3 Another perspective illustration;

[0023] Figure 5 This is a schematic diagram of the structure of the left half gear, the right half gear, and the opening and closing locking mechanism of the present invention.

[0024] Figure 6 For the present invention Figure 5 A magnified structural diagram at point A;

[0025] Figure 7 This is a schematic diagram of the left and right half gears of the present invention in their open states.

[0026] In the diagram: 2. Housing 1; 3. Housing 2; 31. Annular support seat 1; 32. Annular support seat 2; 33. Ball bearing; 4. Input shaft; 5. Drive bevel gear; 6. Opening and closing hollow bevel ring gear; 6L. Left half gear; 6R. Right half gear; 61. Bevel tooth; 62. Polygonal drive surface; 63. Axial through hole; 64. Annular support groove 1; 65. Annular support groove 2; 7. Hinge; 8. Opening and closing locking mechanism; 9. Positioning structure; 91. Positioning tenon; 92. Groove. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 7 As shown, an openable bevel gear right-angle electric wrench head includes a housing 2, which is semi-circular in shape. A second housing 3 is fixedly connected to the housing 2; the two can be an integral casting or a separate structure fastened by bolts. The second housing 3 is a cavity for accommodating the drive bevel gear 5.

[0029] The input shaft 4 is rotatably mounted on the side wall of housing 3 via bearings. One end is used to connect to the power output end of the drive source, which can be a commonly used electric wrench or similar device. The end face of the input shaft 4 has a multi-faceted structure, allowing for quick insertion into the output end of an existing drive source. The other end extends into the interior of housing 3 and is fixed to the drive bevel gear 5 via a key or interference fit. The drive bevel gear 5 can be an arc bevel gear or a straight bevel gear.

[0030] A retractable hollow bevel ring gear 6 is housed within housing 2 3, with its rotation axis perpendicular to the axis of the input shaft 4. A ring of bevel teeth 61 is machined on the upper end face of the bevel ring gear 6, which maintains constant meshing with the driving bevel gear 5, forming a right-angle transmission. The retractable hollow bevel ring gear 6 is composed of a left half-gear 6L and a right half-gear 6R connected by a hinge 7, the axis of which is parallel to the axis of the bevel ring gear. Housing 2 has a side opening aligned with the opening and closing direction of the retractable hollow bevel ring gear 6, allowing the left half-gear 6L and the right half-gear 6R to laterally engage or disengage from the nut during opening and closing. The left half-gear 6L and the right half-gear 6R can rotate relative to each other around the hinge 7, achieving lateral opening and closing. When the nut needs to be engaged, one of the left half gear 6L or the right half gear 6R is positioned inside housing 2, and the other is positioned on one side of housing 2. At this time, the left half gear 6L or the right half gear 6R located outside housing 2 is opened, and the left half gear 6L or the right half gear 6R located inside housing 2 is engaged with the nut, ensuring the nut is within the envelope area of ​​the polygonal driving surface 62. Then, the two half gears are closed, and the polygonal driving surface 62 of the openable hollow bevel ring gear 6 comes into contact with the outer periphery of the nut. Afterwards, the opening and closing locking mechanism 8 locks the left half gear 6L and the right half gear 6R together to prevent them from opening during operation.

[0031] The opening and closing locking mechanism 8 can be a snap-locking mechanism, such as an elastic hook on one half of the gear and a groove on the other half; it can also be a pin-locking mechanism, which locks by inserting a pin laterally; or it can be an eccentric wheel locking mechanism, which achieves quick locking by moving the eccentric wheel to press the mating surface. These mechanisms are simple to operate and reliable in locking. These mechanisms are all existing technologies and will not be described in detail here.

[0032] In the closed state, the polygonal drive surface 62 of the inner wall of the openable hollow bevel ring gear 6 matches the outer contour of the nut, and is usually machined into a hexagon or dodecagon. The hexagonal drive surface can directly mate with a standard hexagonal nut, while the dodecagonal drive surface is compatible with both hexagonal and dodecagonal nuts, offering better adaptability. The diameter of the central axial through hole 63 is larger than the diameter of the bolt shank, allowing the bolt to pass freely. Therefore, regardless of the length of the exposed bolt, it does not affect the lateral insertion and rotation operation of the wrench head.

[0033] like Figure 5 and Figure 6 As shown, to ensure continuous alignment of the bevel teeth 61 at the parting surface of the left half gear 6L and the right half gear 6R after closure, a positioning structure 9 is provided at the joint. The positioning structure 9 is preferably a matching positioning tenon 91 and a groove 92, respectively set on the joint surface of the left half gear 6L and the right half gear 6R, and can be V-shaped, trapezoidal, or rectangular. When closed, the positioning tenon 91 inserts into the groove 92, achieving positioning and bearing part of the shear force, ensuring uniform tooth pitch and smooth transmission of the entire bevel ring gear.

[0034] like Figure 2, Figure 3 , Figure 4 and Figure 5 As shown, an annular support ring 31 is provided on the inner wall of housing 2 3, and an annular support groove 64 is provided on the corresponding position on the outer circumference of the openable hollow bevel ring gear 6. The annular support groove 64 rests on the annular support ring 31 and can withstand radial loads and upward axial loads. An annular support ring 32 is provided on the inner wall of the bottom end of housing 2 3, and an annular support groove 65 is provided on the bottom end of the bevel ring gear 6, which can withstand radial loads and downward axial loads. To further reduce friction, multiple freely rotatable balls 33 are embedded in the side wall of annular support ring 31 and the upper wall of annular support ring 32. The balls 33 form rolling contact with the bottom surface of the corresponding support groove. This structure can ensure the flexible rotation of the bevel ring gear and effectively resist the overturning moment generated when tightening the bolts, thereby improving operational stability and service life.

[0035] In use, the operator first opens the opening and closing locking mechanism 8, opening the left half gear 6L and the right half gear 6R, as follows: Figure 7 As shown in the diagram. Move the wrench head to the side of the nut to be removed, so that the polygonal surface of the left half gear 6L or the right half gear 6R located inside housing 2 first aligns with the side of the nut, then close the left half gear 6L and the right half gear 6R and lock the locking mechanism 8. Next, connect the output end of the electric wrench to the input shaft 4. Power is transmitted through the input shaft 4 and the drive bevel gear 5 to the openable hollow bevel ring gear 6, driving it to rotate. The polygonal drive surface 62 drives the nut to rotate, completing the tightening or loosening operation. After the operation is completed, stop the machine. First, separate the power output end of the power source from the input shaft 4. Then, rotate housing 2 so that one of the left half gear 6L or the right half gear 6R is inside housing 2. Open the locking mechanism, and the left half gear 6L and the right half gear 6R can be disengaged from the side of the nut.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A retractable bevel ring gear right-angle electric wrench head, characterized in that, include: The housing (2) has a side opening; The second housing (3) is fixedly connected to the first housing (2); The input shaft (4) is rotatably inserted through the side wall of the housing (3). One end of the shaft is used to connect to the power output end of the drive source, and the other end extends into the housing (3) and is connected to the drive bevel gear (5). The openable hollow bevel ring gear (6) is rotatably supported in the housing (3) around its own axis, and its axis is perpendicular to the input shaft (4). The upper end face of the bevel ring gear (6) is provided with bevel teeth (61), and the bevel teeth (61) mesh perpendicularly with the drive bevel gear (5). The openable hollow bevel ring gear (6) is formed by connecting the left half gear (6L) and the right half gear (6R) through a hinge (7), and can be opened and closed laterally to be inserted into or released from the nut through the side opening. An opening and closing locking mechanism (8) is provided on the opening and closing hollow bevel ring gear (6) for locking the left half gear (6L) and the right half gear (6R) in a closed state; The inner wall of the openable hollow bevel ring gear (6) is provided with a polygonal driving surface (62), which is used to directly cooperate with the outer periphery of the nut and transmit torque in the closed state; the center of the openable hollow bevel ring gear (6) is provided with an axial through hole (63) that allows the bolt to pass through; The side opening of the housing (2) is aligned with the opening and closing direction of the openable hollow bevel ring gear (6) to allow the left half gear (6L) and the right half gear (6R) to be laterally engaged or disengaged from the nut through the opening and closing action.

2. The opening and closing conical ring gear right-angle electric wrench head according to claim 1, characterized in that: The polygonal driving surface (62) is hexagonal or dodecagonal.

3. The opening and closing conical ring gear right-angle electric wrench head according to claim 1, characterized in that: The opening and closing locking mechanism (8) is a snap-locking mechanism, a pin-locking mechanism, or an eccentric wheel locking mechanism.

4. The opening and closing bevel ring gear right-angle electric wrench head according to claim 1, characterized in that: The left half gear (6L) and the right half gear (6R) are provided with a positioning structure (9) to ensure that the bevel teeth (61) of the left and right half gears are continuously aligned at the joint when the gears are closed.

5. The opening and closing bevel ring gear right-angle electric wrench head according to claim 4, characterized in that: The positioning structure (9) consists of a positioning tenon (91) and a groove (92) that fit together.

6. The opening and closing bevel ring gear right-angle electric wrench head according to claim 1, characterized in that: The inner wall of the housing 2 (3) is provided with an annular support seat ring 1 (31), and the outer periphery of the openable hollow bevel ring gear (6) is provided with an annular support groove 1 (64) that cooperates with the annular support seat ring 1 (31) to bear radial and / or axial loads.

7. The opening and closing conical ring gear right-angle electric wrench head according to claim 6, characterized in that: The bottom inner wall of the housing 2 (3) is provided with an annular support seat 2 (32), and the bottom end of the openable hollow bevel ring gear (6) is provided with an annular support groove 2 (65) that cooperates with the annular support seat 2 (32) to bear radial and / or axial loads.

8. The opening and closing bevel ring gear right-angle electric wrench head according to claim 7, characterized in that: The side wall of the first annular support ring (31) and the upper wall of the second annular support ring (32) are both embedded with a number of rotatable balls (33).

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