Connection device for replacing the gearbox of an electric torque wrench

Abstract

According to an embodiment of the present invention, a connecting device for realizing a gearbox-replaceable electric torque wrench may include a connecting seat (100), the connecting seat (100) including: a seat shaft (110) connected to the motor rotation shaft of an electric motor mounted on the main body housing (10) of the electric torque wrench; and a seat body (120) mounted on a gearbox mating surface (11) corresponding to the portion of the main body housing (10) that engages with the gearbox (20). Additionally, the connecting device for realizing a gearbox-replaceable electric torque wrench may include a connecting adapter (200) mounted on a main body mating surface (21) corresponding to the portion of the gearbox (20) that engages with the main body housing (10) and detachably connected to the connecting seat.

Description

Technical Field

[0001] This invention relates to technology related to electric torque wrenches, and more specifically, to a coupling device for replacing the gearbox of an electric torque wrench. Background Technology

[0002] A torque wrench is a wrench tool used to tighten nuts onto bolts according to a given torque value. These torque wrenches are widely used for bolt tightening in various industrial sectors such as power plants, petrochemicals, construction, automobiles, shipbuilding, and railways. In industrial applications, the output torque value is set according to the target torque value for each piece of equipment based on standards and theoretical calculations, and is determined through long-term, repeated testing. Bolt tightening work is carried out under strict management.

[0003] Torque wrenches come in two types: hydraulic torque wrenches and electric torque wrenches. Hydraulic torque wrenches tighten bolts using torque corresponding to the hydraulic pressure delivered by a hydraulic pump, while electric torque wrenches tighten bolts using torque corresponding to the driving force generated by an electric motor.

[0004] Hydraulic torque wrenches are typically used to tighten bolts on large equipment or structures that require high clamping force. In contrast, electric torque wrenches offer the advantage of being portable, allowing operators to tighten bolts without being limited by operating space.

[0005] Furthermore, because hydraulic torque wrenches are connected to the hydraulic pump via a hose, it is difficult to change the output torque value in real time. This is because even if the hydraulic supply changes, there is a time delay before the output torque value actually changes.

[0006] On the other hand, since electric torque wrenches can control the operation of electric motors in real time via electrical signals, they have the advantage of being able to change the output torque value in real time.

[0007] Typically, an electric torque wrench includes: a main body portion in which an electric motor and motor driver are mounted in an internal housing; a handle portion extending downward from the main body portion; and a battery unit coupled to the bottom surface of the handle portion.

[0008] In addition, the electric torque wrench has a gearbox that is connected in power to the motor rotation shaft of the electric motor at the front of the main body, increasing or decreasing the output according to the drive of the electric motor and transmitting this to the fastening components.

[0009] However, according to existing technology, electric torque wrenches are manufactured and released as a single product, with the main body and gearbox integrated as one unit. That is, the electric torque wrench is manufactured and released as a single product, consisting only of a gearbox with a specific single reduction ratio.

[0010] If each workplace or piece of equipment requires a different reduction ratio for bolt operations, it is necessary to purchase multiple types of electric torque wrenches with different reduction ratios, which can lead to a significant cost burden.

[0011] In addition, from the perspective of staff, there is the inconvenience of having to carry multiple types of electric torque wrenches at the same time. Summary of the Invention

[0012] Technical issues

[0013] In order to solve the above problems, the present invention provides a connecting device. The main body housing of the electric torque wrench is universal. By replacing the gearbox by removing and installing it from the main body housing, a gearbox-replaceable electric torque wrench is realized.

[0014] Technical solution

[0015] According to one aspect of the invention, a coupling device for realizing a gearbox-replaceable electric torque wrench may include a coupling seat 100, the coupling seat 100 comprising: a seat shaft 110, connected to the motor rotation shaft of an electric motor mounted on the main body housing 10 of the electric torque wrench; and a seat body 120, mounted on a gearbox mating surface 11 corresponding to the portion of the main body housing 10 that engages with the gearbox 20. Additionally, the coupling device for realizing a gearbox-replaceable electric torque wrench may include a coupling adapter 200 mounted on a main body mating surface 21 corresponding to the portion of the gearbox 20 that engages with the main body housing 10 and detachably coupled to the coupling seat.

[0016] Invention Effects

[0017] According to an embodiment of the present invention, the main body housing of the electric torque wrench is universal, and it is used by replacing the gearbox by removing and installing the gearbox from the main body housing, thereby achieving the effect of a gearbox-replaceable electric torque wrench. Attached Figure Description

[0018] Figure 1 This is a diagram illustrating the concept of a gearbox replacement electric torque wrench according to an embodiment of the present invention.

[0019] Figures 2 to 6 This is a diagram illustrating a connecting device according to an embodiment of the present invention. Detailed Implementation

[0020] Because this invention can be modified in various ways and has multiple embodiments, specific embodiments are shown in the accompanying drawings and described in detail in the description. However, it should be understood that this invention is not intended to be limited to the form of the specific embodiments, but rather includes all variations, equivalents, and even substitutions that fall within the spirit and technical scope of this invention.

[0021] In this specification, when a constituent element is referred to as "connected" or "joined" to other constituent elements, it should be understood that said constituent element can be directly connected or joined to the other constituent elements, unless specifically stated to the contrary. Otherwise, it should be understood that connection or joining can be achieved through intermediate or other constituent elements. Furthermore, when a particular portion of this specification "includes" a particular constituent element, unless specifically stated to the contrary, it means that other constituent elements may be further included, rather than excluded.

[0022] In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0023] refer to Figure 1 According to an embodiment of the present invention, a gearbox replacement electric torque wrench may include: a main body portion 12, in which an electric motor and a motor driver are mounted in an internal receiving space; a handle portion 14 extending downward from the main body portion; and a main body housing 10, including a detachable battery part 16 coupled to the bottom surface of the handle portion 14; and a gearbox (referring to the gearbox corresponding to the gearbox). Figure 1 The gearboxes, denoted by reference numerals 20a, 20b, and 20c in the accompanying drawings (hereinafter referred to as reference numeral 20), are connected in power to the motor rotation shaft of the electric motor at the front of the main body 12. The output is increased or decreased according to the drive of the electric motor and transmitted to the tightening member.

[0024] Therefore, according to embodiments of the present invention, the gearbox replacement electric torque wrench, using the connecting device described later, can replace gearboxes with various gear ratios (see reference) while the common main body housing 10 remains unchanged. Figure 1 The figures are labeled 20a, 20b, and 20c.

[0025] That is, in the gearbox replacement electric torque wrench, a coupling seat 100 of the coupling device, which will be described later, is provided on the gearbox mating surface 11 in front of the main body 12, in each gearbox having a variety of gear ratios as described above (see reference). Figure 1A coupling adapter 200, which will be described later, is provided on the rear main body mating surface 21 of the aforementioned gearbox 20 (reference numerals 20a, 20b, 20c) of the aforementioned gearbox. At this time, the detachable connection between the common main body housing 10 of the electric torque wrench and the gearbox 20 is made possible by attaching and detaching the coupling seat 100 and the coupling adapter 200.

[0026] The following is for reference. Figures 2 to 6 The following will describe in detail the detailed configuration of each of the connecting seats 100 and connecting adapters 200 constituting the connecting device and the methods of their assembly and disassembly.

[0027] A coupling device for implementing a gearbox-replacement electric torque wrench according to an embodiment of the present invention may include: a seat shaft 110, connected to the motor rotation shaft of an electric motor mounted on the main body housing 10 of the electric torque wrench; and a seat 120, mounted on a gearbox mating surface 11 corresponding to the portion of the main body housing 10 that engages with the gearbox 20 (see reference). Figure 2 and Figure 3 ).

[0028] Additionally, the connection device for implementing the gearbox replacement electric torque wrench according to an embodiment of the present invention may include: a connection adapter 200, which is mounted on a main body mating surface 21 corresponding to the portion that mates with the main body housing 10 of the gearbox 20 and is detachably mated with the connection seat.

[0029] In this embodiment of the invention, the base 120 may be integrally manufactured from a base plate portion 121 constituting the bottom surface of the base and a cylindrical portion 122 constituting the upper surface of the base.

[0030] At this time, the base plate 121 is made to cover the gearbox mating surface 11 according to the outer shape of the gearbox mating surface 11. A first inner circumferential cavity 121A is provided in the center of the bottom surface of the plate. The outer periphery of the plate may include a plurality of bolt holes 121B for bolt fixing to the gearbox mating surface 11.

[0031] At this time, the cylindrical body portion 122 may have a diameter smaller than that of the base plate portion 121 and protrude upwards from the base plate portion 121. The cylindrical body portion 122 includes: a second inner circumferential cavity 122A, which communicates with the first inner circumferential cavity 121A provided on the base plate portion 121 and has the same diameter; a first through hole 122B, which is provided in the center of the upper surface to communicate with the inner circumferential cavity, and the seat shaft 110 is installed through the first through hole 122B; a ball bearing seat rail 122C, which is recessed inwards along the circumference of the upper outer circumferential surface and has a predetermined width; and a plurality of first spline heads 122D, which are provided at the connection between the base plate portion 121 and the cylindrical body portion 122 and are formed at equal intervals along the lower outer circumferential edge of the cylindrical body portion 122.

[0032] In this case, the motor rotation shaft M of the electric motor can be connected to the seat shaft 110 via a predetermined shaft connection device (not shown) (i.e., a connection means for transmitting power between the motor rotation shaft M and the seat shaft 110) respectively embedded in the inner circumferential cavities (121A and 122A) of the base plate portion 121 and the cylindrical body portion 122 (see reference). Figure 4 ).

[0033] Additionally, in an embodiment of the present invention, the connecting seat 100 further includes a connecting shaft 130, which has a cylindrical shape and is mounted on the seat shaft 110, so that the motor rotating shaft and the seat shaft are axially connected by the third inner peripheral cavity 130A surrounding the outer peripheral surface of the seat shaft 110, and a plurality of crown gear-shaped first serrations 130B (see reference) are provided along the upper outer peripheral edge. Figure 3 ).

[0034] Additionally, the coupling adapter 200 may include: a first cylindrical component 210, a second cylindrical component 220, and a coupling hub 230 (see reference). Figure 4 and Figure 5 ).

[0035] At this time, the first cylindrical component 210 may include: a fourth inner peripheral cavity 211, formed extending upward from the bottom surface; a second through hole 212, disposed on the upper surface and communicating with the fourth inner peripheral cavity 211; a plurality of second splines 213, configured on the inner side of the bottom surface to have a shape corresponding to the first spline 122D, so as to engage with the plurality of first splines 122D disposed on the cylindrical body portion 122; the first cylindrical component 210 is provided with an annular guide groove 216 along the mounting position of the bottom outer peripheral guide ring 150 corresponding to the forming position of the second spline 213; the first cylindrical component 210 includes at least one ball bearing seat hole 214, disposed at a predetermined position on the outer peripheral surface.

[0036] At this time, the second cylindrical component 220 may include: an upper inner circumferential cavity 221 and a lower inner circumferential cavity 222, providing space for insertion of the first cylindrical component 210; and a mounting guide 222A, which forms the boundary of the upper inner circumferential cavity 221 and the lower inner circumferential cavity 222 and protrudes inward along the edge of the inner circumferential surface, such that when the first cylindrical component 210 is inserted, a mounting space for the elastic spring 140 is provided. The elastic spring 140 is configured to cover the edge of the outer circumferential surface of the first cylindrical component 210 in the space between the outer circumferential surface of the first cylindrical component 210 and the inner circumferential surface of the second cylindrical component 220. When the first cylindrical component 210 is inserted into the lower inner circumferential surface, the inner wall 223 corresponding to the portion forming the ball bearing seat hole 214 is formed as an inclined surface whose diameter expands towards the bottom surface.

[0037] Here, the connecting hub 230 may include: a hub shaft 231, which is installed in a second through hole 212 disposed on the upper surface of the first cylindrical component 210, wherein the outer peripheral diameter of the hub shaft 231 is smaller than the diameter of the second through hole 212, and is connected to the gearbox 20 transmission shaft; and a second serration 232, which is configured to have a shape corresponding to the first serration 130B on the inner side of the bottom surface, so as to engage with the first serration 130B located on the upper side of the connecting shaft 130.

[0038] According to the above configuration, the connecting hub 230 can be coupled to the connecting shaft 130, and is configured such that the second spline head 213 on the first cylindrical component 210 is coupled to the first spline head 122D on the connecting seat 100. If the connecting seat 100 and the connecting adapter 200 are initially coupled together, the ball bearing 160 provided in the ball bearing seat hole 214 on the first cylindrical component 210 is arranged adjacent to the formation position of the ball bearing seat rail 122C of the connecting seat 100.

[0039] In the initial engagement state, when the second cylindrical component 220 is pulled in the direction of the connecting seat 100, it can be positioned on the ball bearing seat rail 122C of the connecting seat 100 by descending along the inclined surface of the inner wall 223 of the second cylindrical component 220, thereby achieving a fixed engagement between the connecting seat and the connecting adapter.

[0040] Furthermore, in embodiments of the present invention, at least one first locking pin 215 may be formed protruding outward at a predetermined position on the outer peripheral edge of the first cylindrical component 210, and at least one second locking pin 225 may be formed protruding inward at a predetermined position on the inner peripheral edge of the second cylindrical component 220. When the connecting seat and the connecting adapter are fixedly engaged, the first locking pin 215 and the second locking pin 225 may be at different positions at the same height relative to the connecting adapter.

[0041] At this time, in relation to the first cylindrical component 210, the second cylindrical component 220 can be rotated relative to it, so that the second locking pin 225 contacts the first locking pin 215. Since the first locking pin 215 acts as a stop for rotation locking, a locking engagement is achieved between the connecting seat and the connecting adapter. Figure 6 (B)

[0042] The above description refers to embodiments of the present invention. However, it is readily understood that those skilled in the art can make various modifications and alterations to the present invention without departing from the spirit and scope of the invention as set forth in the claims.

Claims

1. A connecting device for realizing a gearbox replacement electric torque wrench, comprising: A coupling seat (100) comprising: a seat shaft (110) connected to the motor rotation shaft of an electric motor mounted on the main body housing (10) of the electric torque wrench; and a seat body (120) mounted on a gearbox mating surface (11) corresponding to the portion of the main body housing (10) that engages with the gearbox (20); and A coupling adapter (200) is mounted on a main body mating surface (21) corresponding to the portion that mates with the main body housing (10) of the gearbox (20) and is detachably coupled to the coupling seat (100). The base (120) is integrally manufactured from a base plate portion (121) constituting the bottom surface of the base (120) and a cylindrical portion (122) constituting the upper surface of the base (120). The base plate (121) is made to cover the gearbox mating surface (11) according to the outer shape of the gearbox mating surface (11). A first inner circumferential cavity (121A) is provided in the center of the bottom surface of the plate. The outer periphery of the plate includes a plurality of bolt holes (121B) for bolt fixing to the gearbox mating surface (11). The cylindrical body portion (122) has a diameter smaller than that of the base plate portion (121) and is formed protruding upwards from the base plate portion (121). The cylindrical body portion (122) includes: a second inner circumferential cavity (122A) communicating with a first inner circumferential cavity (121A) provided on the base plate portion (121) and having the same diameter; a first through hole (122B) provided at the center of the upper surface for communicating with the second inner circumferential cavity (122A), and the seat shaft (110) is installed through the first through hole (122B); a ball bearing seat rail (122C) recessed inwards along the circumference of the upper outer circumferential surface and having a predetermined width; and a plurality of first splines (122D) provided at the connection between the base plate portion (121) and the cylindrical body portion (122) and formed at equal intervals along the lower outer circumferential edge of the cylindrical body portion (122).

2. The connecting device according to claim 1, characterized in that, The connecting seat (100) also includes a connecting shaft (130) having a cylindrical shape and mounted on the seat shaft (110) to surround the outer peripheral surface of the seat shaft (110) through a third inner peripheral cavity (130A), thereby forming a shaft connection between the motor rotating shaft and the seat shaft (110), and having a plurality of crown gear-type first serrations (130B) provided along the upper outer peripheral edge.

3. The connecting device according to claim 2, characterized in that, The coupling adapter (200) includes: a first cylindrical component (210), a second cylindrical component (220), and a coupling hub (230). The first cylindrical component (210) includes: a fourth inner circumferential cavity (211) extending upward from the bottom surface; a second through hole (212) disposed on the upper surface and communicating with the fourth inner circumferential cavity (211); a plurality of second splines (213) configured on the inner side of the bottom surface to have a shape corresponding to the first spline (122D) for engaging with the plurality of first splines (122D) disposed on the cylindrical body portion (122); the first cylindrical component (210) is provided with an annular guide groove (216) along the mounting position of the bottom outer circumferential guide ring (150) corresponding to the forming position of the second spline (213); the first cylindrical component (210) includes at least one ball bearing seat hole (214) disposed at a predetermined position on the outer circumferential surface. The second cylindrical component (220) includes: an upper inner circumferential cavity (221) and a lower inner circumferential cavity (222), providing space for insertion of the first cylindrical component (210); and a mounting guide (222A) forming the boundary of the upper inner circumferential cavity (221) and the lower inner circumferential cavity (222) and protruding inward along the edge of the inner circumferential surface, such that when the first cylindrical component (210) is inserted, a mounting space for an elastic spring (140) is provided, the elastic spring (140) being configured to cover the edge of the outer circumferential surface of the first cylindrical component (210) in the space between the outer circumferential surface of the first cylindrical component (210) and the inner circumferential surface of the second cylindrical component (220), and when the first cylindrical component (210) is inserted into the lower inner circumferential surface, the inner wall (223) corresponding to the portion forming the ball bearing seat hole (214) is formed as an inclined surface whose diameter of the inner circumferential surface increases towards the bottom surface. The connecting hub (230) includes: a hub shaft (231) installed in a second through hole (212) disposed on the upper surface of the first cylindrical component (210), the outer peripheral diameter of the hub shaft (231) being smaller than the diameter of the second through hole (212), and connected to the gearbox (20) transmission shaft; and a second sawtooth (232) configured to have a shape corresponding to the first sawtooth (130B) on the inner side of the bottom surface, so as to engage with the first sawtooth (130B) located on the upper side of the connecting shaft (130).

4. The connecting device according to claim 3, characterized in that, The connecting hub (230) is coupled to the connecting shaft (130) and configured such that the second spline head (213) on the first cylindrical component (210) is coupled to the first spline head (122D) on the connecting seat (100). If the connecting seat (100) and the connecting adapter (200) are initially coupled together, the ball bearing (160) provided in the ball bearing seat hole (214) on the first cylindrical component (210) is arranged adjacent to the formation position of the ball bearing seat rail (122C) of the connecting seat (100). In the initial combined state of the connecting seat (100) and the connecting adapter (200), when the second cylindrical component (220) is pulled in the direction of the connecting seat (100), it is positioned on the ball bearing seat rail (122C) of the connecting seat (100) by descending along the inclined surface of the inner wall (223) of the second cylindrical component (220), thereby achieving a fixed connection between the connecting seat (100) and the connecting adapter (200).

5. The connecting device according to claim 4, characterized in that, At least one first locking pin (215) is formed protruding outward at a predetermined position on the outer peripheral edge of the first cylindrical component (210). At least one second locking pin (225) is formed protruding inward at a predetermined position on the inner circumferential edge of the second cylindrical component (220). When the connector (100) and the connector adapter (200) are fixedly engaged, the first locking pin (215) and the second locking pin (225) are at different positions at the same height relative to the connector adapter (200). In relation to the first cylindrical component (210), the second cylindrical component (220) is rotated relative to the first cylindrical component (220) so that the second locking pin (225) contacts the first locking pin (215). Since the first locking pin (215) acts as a stop for rotation locking, a locking engagement is achieved between the coupling seat (100) and the coupling adapter (200).

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