Step type special head for tightening bolt

Abstract

The utility model discloses a stepped special head for tightening a bolt, which belongs to the field of tightening tools and comprises a gear eccentric head and a connector for mounting a torque joint on the gear eccentric head. The gear eccentric head comprises a shell, an input connector, an output connector and a transmission part, wherein the input connector and the output connector are rotationally installed at the two ends of the shell, and the transmission part is arranged in the shell and used for transmitting kinetic energy on the input connector to the output connector. The shell comprises a supporting part, a first end and a second end, the first end and the second end correspond to the input connector and the output connector respectively, the first end and the second end are located at the two ends of the supporting part respectively and extend outwards in the transverse direction of the supporting part, and the extending direction of the second end is opposite to that of the first end. The special head is simple in structure and convenient to use, and the second end of the special head can effectively stretch into a narrow space with a transverse shield to act on a bolt or a nut in the narrow space for tightening operation.

Description

Technical Field

[0001] This application relates to the field of tightening tool technology, specifically a stepped special head for tightening bolts. Background Technology

[0002] In the installation of mechanical parts, a large number of bolts are required for fixing. Tightening bolts or nuts mainly relies on wrenches of the same type. However, when dealing with tightening operations in confined spaces, the special shape of the wrench makes it difficult to rotate internally. Therefore, a gear-driven eccentric head is generally used to tighten bolts or nuts in confined spaces that are difficult for ordinary tools to access, transmitting the necessary torque to achieve the tightening of bolts or nuts in narrow spaces.

[0003] While the gear eccentric heads of tightening tools currently on the market can extend into narrow spaces, when there is a lateral obstruction at the location of the bolt or nut to be tightened, it is difficult for their output connector to act on the nut, making it difficult to tighten the bolt or nut at that location.

[0004] Therefore, this application provides a stepped special head for bolt tightening to solve the above-mentioned problems. Utility Model Content

[0005] This application provides a stepped special head for bolt tightening, which aims to solve the problem mentioned in the background art that existing special heads are difficult to enter into narrow spaces with lateral obstructions for tightening operations.

[0006] To achieve the above objectives, this application provides the following technical solution: a stepped special head for bolt tightening, comprising a gear eccentric head and a connector for mounting a torque connector on the gear eccentric head, the gear eccentric head comprising a housing, an input connector and an output connector rotatably mounted at both ends of the housing, and a transmission component disposed inside the housing for transmitting kinetic energy from the input connector to the output connector.

[0007] In order to enable the tightening of bolts or nuts in narrow spaces with lateral obstructions, the housing includes a support portion and a first end and a second end corresponding to the input connector and the output connector, respectively. The first end and the second end are located at the two ends of the support portion and extend outward along the lateral direction of the support portion, and the extension direction of the second end is opposite to that of the first end. In this way, the output head on the second end can extend into the narrow space with lateral obstructions and act on the bolt or nut.

[0008] To achieve the transfer of kinetic energy and the tightening of bolts or nuts, the transmission component includes an input gear and an output gear fixedly mounted on the input connector and the output connector, respectively; a first transmission gear rotatably mounted within the support portion; at least one second transmission gear rotatably mounted inside the first end and meshing sequentially with the input gear; and at least one third transmission gear rotatably mounted inside the second end and meshing sequentially with the output gear. One end of the first transmission gear extends into the interior of the first end and meshes with one of the second transmission gears, while the other end extends into the interior of the second end and meshes with one of the third transmission gears. Thus, the kinetic energy on the input connector is transferred to the first transmission gear via the input gear and the second transmission gear, causing the first transmission gear to rotate. Under the action of the third transmission gear, the kinetic energy is transferred to the output gear, thereby causing the output connector to rotate, and thus achieving the tightening operation of the bolt or nut.

[0009] Preferably, the input connector has a spline groove at the end away from the input gear for the insertion of the output head of the torque connector, and the output connector has a positioning groove at the end away from the output gear to be adapted to a bolt or bolt bit.

[0010] Preferably, the connector includes a support plate fitted onto the outside of the input connector and fixedly connected to the first end, and a connecting frame fixedly mounted on the torque connector;

[0011] An external gear disk is fixedly installed inside the support disk. The support disk and the external gear disk are coaxially arranged with the input connector. The end of the input connector away from the input gear passes through the support disk and extends into the interior of the external gear disk.

[0012] An internal gear disk that meshes with the external gear disk is fixedly installed on the connecting frame. The internal gear disk is coaxially arranged with the output head, and the output head extends through the connecting frame into the interior of the internal gear disk.

[0013] Preferably, the input connector is fitted with a bearing that is connected to the external gear plate.

[0014] Preferably, the support plate is provided with at least two positioning blocks arranged in a circular array, and the first end is provided with a slot adapted to the positioning block.

[0015] This special head has a simple structure and is easy to use. Its gear eccentric head adopts a stepped shape consisting of a support part, a first end, and a second end. The second end can effectively extend into a narrow space with lateral obstruction to tighten the bolts or nuts inside. Attached Figure Description

[0016] Figure 1This is a schematic diagram of a stepped special head for bolt tightening;

[0017] Figure 2 This is an exploded structural diagram of a stepped special head for bolt tightening;

[0018] Figure 3 This is a schematic diagram of the structure of a gear eccentric head in a stepped special head used for bolt tightening;

[0019] Figure 4 This is a schematic diagram of the torque connector in a stepped special head used for bolt tightening.

[0020] In the picture:

[0021] 1. Eccentric head of gear;

[0022] 11. Shell;

[0023] 111. Support section;

[0024] 112. First end;

[0025] 1121. Card slot;

[0026] 113. The second end;

[0027] 12. Input connector;

[0028] 121. Spline groove;

[0029] 122. Bearings;

[0030] 13. Output connector;

[0031] 131. Positioning groove;

[0032] 14. Transmission components;

[0033] 141. Input gear;

[0034] 142. Output gear;

[0035] 143. First transmission gear;

[0036] 144. Second transmission gear;

[0037] 145. Third transmission gear;

[0038] 2. Connector;

[0039] 21. Support plate;

[0040] 211. External gear disc;

[0041] 212. Card slot;

[0042] 22. Connecting frame;

[0043] 221. Internal gear disc;

[0044] 3. Torque connector;

[0045] 31. Output head. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] Example 1

[0048] This embodiment provides a stepped special head for bolt tightening, such as... Figure 1 , Figure 2 and Figure 3 As shown, the special head includes a gear eccentric head 1 and a connector 2 for mounting a torque connector 3 on the gear eccentric head 1. The gear eccentric head 1 includes a housing 11, an input connector 12 and an output connector 13 rotatably mounted at both ends of the housing 11, and a transmission component 14 disposed inside the housing 11 for transmitting kinetic energy from the input connector 12 to the output connector 13.

[0049] To enable tightening of bolts or nuts in confined spaces with lateral obstructions, unlike existing special heads, the housing 11 includes a support portion 111 and a first end 112 and a second end 113 corresponding to the input connector 12 and the output connector 13, respectively. The first end 112 and the second end 113 are located at opposite ends of the support portion 111 and extend outward along the lateral direction of the support portion 111, with the second end 113 extending in the opposite direction to the first end 112. The transmission component 14 includes an input gear 1 that is fixedly mounted on the input connector 12 and the output connector 13. 41 and output gear 142, a first transmission gear 143 rotatably mounted in the support portion 111, at least one second transmission gear 144 rotatably mounted inside the first end 112 and meshing sequentially with the input gear 141, and at least one third transmission gear 145 rotatably mounted inside the second end 113 and meshing sequentially with the output gear 142; wherein, one end of the first transmission gear 143 extends into the interior of the first end 112 and meshes with one of the second transmission gears 144, and the other end extends into the interior of the second end 113 and meshes with one of the third transmission gears 145.

[0050] In use, the second end 113 of the gear eccentric head 1 is inserted into the narrow space with a lateral obstruction, so that its support part 111 bypasses the lateral obstruction. The second end 113 is in the same space as the bolt or nut to be tightened, so that the output connector 13 acts on the bolt or nut to be tightened. The input connector 3 is connected to the input connector 12 through the connector 2, which drives the input connector 12 to rotate. The input gear 141 drives the second transmission gear 144 to rotate, which in turn drives the first transmission gear 143 to rotate. Under the action of the third transmission gear 145, the output gear 142 is driven to rotate, which in turn drives the output connector 13 to rotate, thus realizing the tightening operation of the bolt or nut.

[0051] like Figure 2 , Figure 3 and Figure 4 As shown, to achieve the transfer of kinetic energy and tighten the bolt or nut, the input connector 12, at the end away from the input gear 141, has a spline groove 121 for the output head 31 of the torque connector 3 to be inserted. The output head 31 of the torque connector 31 is directly inserted into the spline groove 121 of the input connector 12, fixing the input connector 12 and the output head 31, thereby transmitting the power from the torque connector 3 to the input connector 12, causing it to drive the output connector 12 to rotate. To connect the output connector 13 to the bolt or nut to be tightened, the end of the output connector 13 away from the output gear 142 has a positioning groove 131 adapted to the bolt or bolt bit. The positioning groove 131 is directly fitted onto the matching bolt or nut, thereby fixing the output connector to the bolt or nut to be tightened, enabling the output connector 13 to drive the bolt or nut to tighten. Of course, when the positioning groove 131 is not compatible with the bolt or nut, it can be adapted using a bolt cutter bit, and the output connector 13 can be applied to the bolt or nut for operation.

[0052] It should be noted that the torque connector 3 is connected to the output shaft of the electric gun via the connecting handle. The bevel gear on the transmission shaft drives the bevel gear on the output head 31 to rotate, thereby driving the input connector 12.

[0053] Example 2

[0054] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, to ensure the stability of the connection between the torque connector 3 and the gear eccentric head 1, unlike Embodiment 1, the connector 2 includes a support plate 21 fitted on the outside of the input connector 12 and fixedly connected to the first end 112, and a connecting frame 22 fixedly installed on the torque connector 3; an external gear plate 211 is fixedly installed inside the support plate 21, and the support plate 21 and the external gear plate 211 are coaxially arranged with the input connector 12, with one end of the input connector 12 away from the input gear 141 passing through the support plate 21 and extending into the interior of the external gear plate 211; an internal gear plate 221 that meshes with the external gear plate 211 is fixedly installed on the connecting frame 22, and the internal gear plate 221 is coaxially arranged with the output head 31, with the output head 31 passing through the connecting frame 22 and extending into the interior of the internal gear plate 221.

[0055] In use, the internal gear disc 221 on the support disc 21 is fitted onto the internal gear disc 211 on the support disc 21, and the internal gear disc 221 meshes with the external gear disc 211, thereby connecting the torque connector 3 to the gear eccentric head 1. At this time, the output head 31 of the torque connector 3 is inserted into the spline groove 121 of the input connector 12 and fixed, so that the output head 31 can drive the output connector 12 to rotate.

[0056] It should be noted that, in order to ensure the stability of the rotation of the output connector 12, the input connector 12 is fitted with a bearing 122 connected to the external gear disk 211. The bearing 122 connects the external gear disk 211 to the input connector 12, and supports the input connector 12 without affecting its rotation, so as to ensure the stability of the rotation of the input connector 12.

[0057] To fix the support plate 21 to the first end 112, at least two positioning blocks 212 arranged in a circular array are provided on the support plate 21. The first end 112 has a slot 1121 that is adapted to the positioning block 212. The positioning block 212 and the slot 1121 are interference-fitted, and the positioning block 212 is fixedly engaged in the slot 1121 when no force is applied.

[0058] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A stepped special head for bolt tightening, comprising a gear eccentric head (1) and a connector (2) for mounting a torque connector (3) on the gear eccentric head (1), the gear eccentric head (1) comprising a housing (11), an input connector (12) and an output connector (13) rotatably mounted at both ends of the housing (11), and a transmission component (14) disposed inside the housing (11) for transmitting kinetic energy on the input connector (12) to the output connector (13); characterized in that The housing (11) includes a support portion (111) and a first end (112) and a second end (113) corresponding to the input connector (12) and the output connector (13) respectively. The first end (112) and the second end (113) are located at both ends of the support portion (111) and extend outward along the lateral direction of the support portion (111). The extension direction of the second end (113) is opposite to that of the first end (112). The transmission component (14) includes an input gear (141) and an output gear (142) respectively fixedly mounted on the input connector (12) and the output connector (13), a first transmission gear (143) rotatably mounted in the support (111), at least one second transmission gear (144) rotatably mounted inside the first end (112) and meshing sequentially with the input gear (141), and at least one third transmission gear (145) rotatably mounted inside the second end (113) and meshing sequentially with the output gear (142); One end of the first transmission gear (143) extends into the interior of the first end (112) and meshes with one of the second transmission gears (144), while the other end extends into the interior of the second end (113) and meshes with one of the third transmission gears (145).

2. The stepped special head for bolt tightening according to claim 1, characterized in that: The input connector (12) has a spline groove (121) at the end away from the input gear (141) for the output head (31) of the torque connector (3) to be inserted, and the output connector (13) has a positioning groove (131) at the end away from the output gear (142) to be adapted to the bolt or bolt bit.

3. The stepped special head for bolt tightening according to claim 2, characterized in that: The connector (2) includes a support plate (21) fitted on the outside of the input connector (12) and fixedly connected to the first end (112) and a connecting frame (22) fixedly installed on the torque connector (3); An external gear disk (211) is fixedly installed inside the support disk (21). The support disk (21) and the external gear disk (211) are coaxially arranged with the input connector (12). One end of the input connector (12) away from the input gear (141) passes through the support disk (21) and extends into the interior of the external gear disk (211). An internal gear disk (221) that meshes with the external gear disk (211) is fixedly installed on the connecting frame (22). The internal gear disk (221) is coaxially arranged with the output head (31). The output head (31) passes through the connecting frame (22) and extends into the interior of the internal gear disk (221).

4. The stepped special head for bolt tightening according to claim 3, characterized in that: The input connector (12) is fitted with a bearing (122) that is connected to the external gear disc (211).

5. The stepped special head for bolt tightening according to claim 3, characterized in that: At least two positioning blocks (212) arranged in a ring array are provided on the support plate (21), and the first end (112) is provided with a slot (1121) adapted to the positioning block (212).

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