Tightening tool

Abstract

The invention belongs to the technical field of machine manufacturing, and discloses a tightening tool. The device comprises a fixed table and a wrench assembly, at least two sets of positioning sleeves are installed on the fixed table, a rotating sleeve is further installed on the fixed table, the wrench assembly is inserted into the fixed table, the wrench assembly is connected with the rotating sleeve, the wrench assembly drives the rotating sleeve to rotate, and the positioning sleeves and the rotating sleeve are inserted into installation bolts on a flange plate at the same time; the problem that in the prior art, when wrenches are used for fastening bolts, the two hands need to hold the wrenches to fix the bolts on the flange is solved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to a tightening tool. Background Art

[0002] During the engine assembly process, the water pump impeller is connected to the water pump through a flange, and the water pump impeller is fixed to the flange of the water pump shaft inside the water pump by bolts. However, before assembly, the water pump shaft is in a free rotation state. During the installation of the water pump impeller on the flange, the bolts need to be tightened to a set torque so that the water pump impeller and the flange can be tightly connected. However, if the bolts are turned forcefully with a wrench, the tightening torque of the wrench will directly act on a point of the water pump impeller. The above torque will cause the water pump shaft to rotate significantly, and the flange and the unfixed water pump impeller will be in a rotating state, making it impossible to fix the water pump impeller on the flange, and a large degree of shaking will occur during the tightening process.

[0003] Under the existing technology, in order to solve the above problems, the operator usually uses another set of wrenches to fix the belt tensioner pulley to stop the belt on the belt tensioner pulley from moving, so that the water pump wheel connected to the belt can be fixed. After that, the operator uses the wrench to fix the water pump wheel and the flange to finally complete the installation. However, this requires the operator to hold the wrench in both hands. On the one hand, the water pump wheel needs to be fixed on the flange, and on the other hand, the water pump wheel needs to be prevented from rotating and locking the belt tensioner pulley. The operation is difficult and requires a high level of proficiency during the tightening process. The operation quality after tightening cannot be maintained. At the same time, since the axis of the water pump shaft is parallel to the horizontal plane, the operator needs to install the wrench on the side of the engine. During the rotation, the wrench is prone to fall out. Summary of the invention

[0004] The purpose of the present invention is to provide a tightening tool to solve the problem that in the prior art, when a wrench is used to tighten the bolts, both hands need to hold the wrench to fix the bolts on the flange.

[0005] To achieve this object, the present invention adopts the following technical solution: the present invention provides a tightening tool, including a fixed platform and a wrench assembly, at least two sets of positioning sleeves are installed on the fixed platform, and a rotating sleeve is also installed on the fixed platform. The wrench assembly is inserted into the fixed platform, the wrench assembly is connected to the rotating sleeve, and the wrench assembly drives the rotating sleeve to rotate, and the positioning sleeve and the rotating sleeve are simultaneously inserted into the mounting bolts on the flange.

[0006] Preferably, the positioning sleeve is provided with a socket, a guide shaft is inserted into the socket, a spring is sleeved on the guide shaft, one side of the spring is connected to the guide shaft, and the other side is connected to the fixing platform.

[0007] Preferably, the fixed platform includes a first side plate and a second side plate, the first side plate and the second side plate are parallel to each other, the first side plate and the second side plate are connected by screws, a sliding bearing is clamped between the first side plate and the second side plate, and the guide shaft is sleeved in the sliding bearing.

[0008] Preferably, a first opening is formed on the first side plate, a second opening is formed on the second side plate, the sliding bearing is inserted into the first opening and the second opening, and the first opening and the second opening are in the shape of elongated holes.

[0009] Preferably, the first openings correspond one-to-one with the positioning sleeves, and the two groups of the first openings are distributed in an eight-shaped pattern, and the second openings correspond one-to-one with the positioning sleeves, and the two groups of the second openings are distributed in an eight-shaped pattern.

[0010] Preferably, a bracket is installed between the first side plate and the second side plate, an adjusting bolt is screwed on the bracket, a plug-in plate is installed on the outer wall of the sliding bearing, a sliding sleeve is sleeved on the tail of the adjusting bolt, the plug-in plate is plugged into the sliding sleeve, and the axis of the adjusting bolt is perpendicular to the axis of the guide shaft.

[0011] Preferably, a one-way ratchet is installed between the first side plate and the second side plate, and the wrench assembly includes a tightening gun, a rotating shaft at the front end of the tightening gun is connected to a rotating sleeve, an intermediate sleeve is sleeved on the rotating shaft, and the intermediate sleeve is sleeved in the one-way ratchet, and one group of the screws passes through the one-way ratchet.

[0012] Preferably, positioning rings are sleeved on both sides of the sliding bearing axis, wherein one group of the positioning rings abuts against a side of the first side plate away from the second side plate, and the other side of the positioning rings abuts against a side of the second side plate away from the first side plate.

[0013] Preferably, a ratchet sleeve is rotatably installed on the inner side of the one-way ratchet, and the ratchet sleeve can only rotate to one side. A clamping portion is formed at one end of the intermediate sleeve, and the clamping portion is hexagonal and inserted into the ratchet sleeve. A sleeve ring is sleeved on the outer side of the rotating shaft, and the sleeve ring is connected to the clamping portion, and the sleeve ring abuts against the ratchet sleeve.

[0014] Preferably, a sleeve connection portion is formed at one end of the intermediate sleeve, the sleeve connection portion is cylindrical, the sleeve connection portion is connected to a fixed sleeve on the tightening gun, and the sleeve connection portion is inserted into the fixed sleeve.

[0015] Beneficial effect: the rotating sleeve is sleeved on the mounting bolts on the flange, and the wrench assembly is rotated so that the wrench assembly drives one group of mounting bolts to rotate, and the mounting bolts connected to the wrench assembly are tightened. Since the fixed platform is also in contact with the other two groups of mounting bolts through the positioning sleeve, the fixed platform connected to the wrench assembly and the mounting bolts on the flange have at least three groups of connection points, and the wrench assembly on one group of connection points generates torque, which is transmitted and dispersed on the fixed platform, so that the remaining two groups of positioning sleeves also generate torques in different directions, wherein the torque generated by the positioning sleeve in the opposite direction offsets the torque of the rotating sleeve on the wrench assembly, and finally the torque transmitted to the flange by the wrench assembly can be reduced, and the rotation amplitude of the flange is reduced, and finally the mounting bolts are fixed by installing the handheld tightening tool with one hand, so that the fixing method is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the working of the tightening tool of the present invention;

[0017] Figure 2 This is a schematic diagram of the installation of the fixing sleeve of the present invention;

[0018] Figure 3 This is a main diagram of the tightening tool of the present invention;

[0019] Figure 4 This is a schematic diagram of the working state of the adjusting bolt of the present invention;

[0020] Figure 5 It is an exploded view of the tightening tool of the present invention;

[0021] Figure 6 It is a front view of the second side panel of the present invention.

[0022] In the figure: 1. fixed platform; 11. first side plate; 111. first opening; 12. second side plate; 121. second opening; 13. screw; 14. sliding bearing; 141. plug-in plate; 15. bracket; 16. adjusting bolt; 17. one-way ratchet; 171. ratchet sleeve; 18. sliding sleeve; 2. wrench assembly; 21. tightening gun; 211. rotating shaft; 212. fixed sleeve; 3. positioning sleeve; 31. socket; 4. rotating sleeve; 5. water pump wheel; 6. mounting bolt; 7. guide shaft; 8. spring; 9. intermediate sleeve; 91. clamping part; 92. sleeve part; 10. sleeve ring; 20. positioning ring. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0027] Under the existing technology, since the water pump shaft is in an unconstrained free rotation state during the initial assembly stage, when the operator applies torque to tighten the bolts, the rotational torque generated by the wrench will form an asymmetric load acting on the local area of ​​the water pump wheel. This single-point stress state will cause the linkage rotation effect of the water pump shaft and the flange, resulting in dynamic instability of the assembly reference surface. This unstable mechanical state will not only cause radial runout and axial movement of the water pump wheel during the tightening process, but also form a vicious cycle of mechanical feedback, making it impossible to effectively transmit the bolt preload according to the established process parameters, seriously affecting the coaxiality accuracy of the connection structure and the contact surface fit. Although the existing solution of using two wrenches to work together can achieve indirect constraint by fixing the belt tensioner, this process method has multiple technical limitations. The simultaneous operation of both hands places strict requirements on the spatial perception ability and force coordination of the operator, and tool interference is very likely to occur in the narrow engine compartment working environment; secondly, the maintenance of dynamic balance requires the operator to maintain high-precision fine-tuning throughout the process. This process mode with strong manual dependence is difficult to achieve standardized operation; thirdly, the horizontal axial installation posture leads to the limitation of the force application angle of conventional wrench tools, there is a risk of tool slippage and it is difficult to obtain an effective torque fulcrum. This kind of traditional process not only significantly prolongs the assembly cycle, but also increases the discreteness of the preload force of the connection structure due to the uncertainty of human factors, which buries potential quality risks for the engine transmission system. At the same time, the axis of the water pump shaft is parallel to the horizontal plane, and the wrench is fixed from the side of the engine. During the tightening process, the wrench may come out, posing a safety risk.

[0028] In order to solve the above problems, Figures 1 to 6 As shown, the present invention provides a tightening tool, which includes a fixed platform 1 and a wrench assembly 2, at least two sets of positioning sleeves 3 are installed on the fixed platform 1, and a rotating sleeve 4 is also installed on the fixed platform 1, the wrench assembly 2 is inserted into the fixed platform 1, the wrench assembly 2 is connected to the rotating sleeve 4, the wrench assembly 2 drives the rotating sleeve 4 to rotate, and the positioning sleeve 3 and the rotating sleeve 4 are simultaneously inserted into the mounting bolts 6 on the flange.

[0029] The fixing platform 1 is connected and fixed to the mounting bolts 6 on the water pump wheel 5 by means of a positioning sleeve 3 and a rotating sleeve 4, wherein one end of the positioning sleeve 3 is formed with a hexagonal plug interface, and one end of the rotating sleeve 4 is also formed with a hexagonal plug interface, so that both the positioning sleeve 3 and the rotating sleeve 4 can be plugged into the nut of the mounting bolt 6 to be tightened. It should be particularly noted that the positioning sleeve 3 and the rotating sleeve 4 are both installed on the fixing platform 1 in a detachable connection manner, so that the fixing platform 1 can be installed with positioning sleeves 3 and rotating sleeves 4 with different plug interface shapes, so that the tightening tool can be tightened and fixed according to mounting bolts 6 of different shapes, so that the adaptation of the tightening tool can be stronger.

[0030] The cam 1 is then rotated to rotate with the cam 2 being engaged with the pump wheel 5. The cam 1 is then rotated to rotate with the cam 2 being engaged with the pump wheel 5.

[0031] The positioning sleeve 3 is provided with a socket 31, in which a guide shaft 7 is inserted, and a spring 8 is sleeved on the guide shaft 7. One side of the spring 8 is connected to the guide shaft 7, and the other side is connected to the fixing platform 1. In the process of the wrench assembly 2 tightening the mounting bolt 6 by rotating the sleeve 4, the spring 8 on the positioning sleeve 3 gradually shrinks, and the fixing platform 1 gradually approaches the water pump wheel 5 to cooperate with the screwing in of the mounting bolt 6, so that the positioning sleeve 3 can always abut against the mounting bolt 6, and the torque can be continuously distributed on the two groups of bolts on the lower side of the positioning sleeve 3, which can achieve the effect of offsetting the torque of the mounting bolt 6 on the wrench assembly 2, so that the rotation tendency of the water pump wheel 5 is reduced, and then the wrench assembly 2 can be held in one hand, and the other hand can be directly used to complete the installation by hand-holding, thereby reducing the difficulty of installing the bolts on the water pump wheel 5.

[0032] The fixing platform 1 of the present invention comprises a first side plate 11 and a second side plate 12, the first side plate 11 and the second side plate 12 are parallel to each other, the first side plate 11 and the second side plate 12 are connected by screws 13, a sliding bearing 14 is clamped between the first side plate 11 and the second side plate 12, and the guide shaft 7 is sleeved in the sliding bearing 14.

[0033] A sliding bearing 14 is installed between the first side plate 11 and the second side plate 12, wherein the sliding bearing 14 is a linear bearing, which can reduce the resistance generated during the sliding of the guide shaft 7 relative to the fixed platform 1. When the fixed platform 1 approaches the water pump wheel 5, the fixed platform 1 moves more smoothly, making it easier for the operator to tighten the wrench assembly 2.

[0034] A first opening 111 is formed on the first side plate 11 , and a second opening 121 is formed on the second side plate 12 . The sliding bearing 14 is inserted into the first opening 111 and the second opening 121 . The first opening 111 and the second opening 121 are in the shape of long strips.

[0035] The first opening 111 and the second opening 121 also correspond one to one, and the sliding bearing 14 is inserted into the first opening and the second opening 121 at the same time. The distances between the mounting bolts 6 on the water pump wheels 5 of different specifications are quite different, so by adjusting the position of the sliding bearing 14, the positions of different mounting bolts 6 on the water pump wheel 5 can be adapted, making the tightening tooling operation of the present invention more labor-saving.

[0036] The first openings 111 correspond to the positioning sleeves 3 one by one, and the two groups of first openings 111 are distributed in an eight-shaped pattern. The second openings 121 correspond to the positioning sleeves 3 one by one, and the two groups of second openings 121 are distributed in an eight-shaped pattern. The present invention can adjust the position of the positioning sleeves 3 to adapt to the water pump wheel 5 with different numbers and distances of mounting bolts 6, so that the rotating sleeve 4 and the two groups of positioning sleeves 3 are distributed in triangular shapes of different shapes, so that the torque on the rotating sleeve 4 can offset the torque on the positioning sleeve 3, and finally reduce the rotation amplitude of the fixed platform 1, making the process of tightening the mounting platform bolts more labor-saving.

[0037] A bracket 15 is installed between the first side plate 11 and the second side plate 12, and an adjusting bolt 16 is screwed on the bracket 15. A plug-in plate 141 is installed on the outer wall of the sliding bearing 14. A sliding sleeve 18 is sleeved on the tail of the adjusting bolt 16. The plug-in plate 141 is plugged into the sliding sleeve 18, and the axis of the adjusting bolt 16 is perpendicular to the axis of the guide shaft 7.

[0038] By rotating the adjusting bolt 16 and moving the adjusting bolt 16 along its own axis, the sliding sleeve 18 installed at the tail of the adjusting bolt 16 will move along with the adjusting bolt 16. Since the plug-in plate 141 is plugged into the sliding sleeve 18, the sliding sleeve 18 will drive the plug-in plate 141 to move along the axis of the adjusting bolt 16. The adjusting bolt 16 pulls the sliding sleeve 18 to move, and the sliding sleeve 18 drives the sliding bearing 14 on the plug-in plate 141 to move in the first opening 111 and the second opening 121. The spacing between the two groups of sliding bearings 14 may move away from each other or closer to each other as the adjusting bolt 16 moves, and the plug-in plate 141 on the sliding bearing 14 will be plugged and slide in the sliding sleeve 18.

[0039] A one-way ratchet 17 is installed between the first side plate 11 and the second side plate 12. The wrench assembly 2 includes a tightening gun 21. The rotating shaft 211 at the front end of the tightening gun 21 is connected to the rotating sleeve 4. An intermediate sleeve 9 is sleeved on the rotating shaft 211. The intermediate sleeve 9 is sleeved in the one-way ratchet 17, and the screw 13 passes through the one-way ratchet 17.

[0040] The present invention uses a tightening gun 21 to tighten, and the tightening gun 21 automatically rotates, and the intermediate sleeve 9 is clamped in the one-way ratchet 17. The one-way ratchet 17 can prevent the tightening gun 21 from rotating in the opposite direction, and prevent the mounting bolt 6 from being screwed out in the opposite direction.

[0041] Positioning rings 20 are sleeved on both sides of the axis of the sliding bearing 14, one set of positioning rings 20 abuts against the side of the first side plate 11 away from the second side plate 12, and the other side positioning rings 20 abut against the side of the second side plate 12 away from the first side plate 11. Positioning rings 20 are installed on both sides of the fixed platform 1, and the positioning rings 20 can limit the sliding bearing 14 on both sides of the fixed platform 1. When the adjusting bolt 16 drives the sliding bearing 14 to move, it can prevent the sliding bearing 14 from falling out, thereby improving the reliability of the tightening tooling.

[0042] A ratchet sleeve 171 is rotatably installed on the inner side of the one-way ratchet 17, and the ratchet sleeve 171 can only rotate to one side. A clamping portion 91 is formed at one end of the intermediate sleeve 9, and the clamping portion 91 is hexagonal and inserted into the ratchet sleeve 171. A sleeve ring 10 is sleeved on the outer side of the rotating shaft 211, and the sleeve ring 10 is connected to the clamping portion 91. The sleeve ring 10 abuts against the ratchet sleeve 171. The sleeve ring 10 can press the ratchet sleeve 171 and the clamping portion 91, so that the rotating shaft 211 can be more tightly connected to the ratchet sleeve 171, and the rotating shaft 211 and the ratchet sleeve 171 can rotate synchronously in the direction allowed by the one-way ratchet 17 to avoid slipping.

[0043] A sleeve connection portion 92 is formed at one end of the intermediate sleeve 9, and the sleeve connection portion 92 is cylindrical. The sleeve connection portion 92 is connected to the fixed sleeve 212 on the tightening gun 21, and the sleeve connection portion 92 is inserted into the fixed sleeve 212. The sleeve connection portion 92 on the other side of the intermediate sleeve 9 is sleeved on the fixed sleeve 212 of the tightening gun 21, so that the intermediate sleeve 9 can rotate synchronously with the rotating shaft 211 to avoid slipping.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A tightening tool, characterized in that: The invention comprises a fixed platform (1) and a wrench assembly (2), wherein at least two sets of positioning sleeves (3) are installed on the fixed platform (1), and a rotating sleeve (4) is also installed on the fixed platform (1), wherein the wrench assembly (2) is inserted into the fixed platform (1), the wrench assembly (2) is connected to the rotating sleeve (4), and the wrench assembly (2) drives the rotating sleeve (4) to rotate, and the positioning sleeve (3) and the rotating sleeve (4) are simultaneously inserted into the mounting bolts (6) on the flange.

2. The tightening tool according to claim 1, characterized in that: The positioning sleeve (3) is provided with a socket (31), a guide shaft (7) is inserted into the socket (31), a spring (8) is sleeved on the guide shaft (7), one side of the spring (8) is connected to the guide shaft (7), and the other side is connected to the fixing platform (1).

3. The tightening tool according to claim 2, characterized in that: The fixed platform (1) comprises a first side plate (11) and a second side plate (12); the first side plate (11) and the second side plate (12) are parallel to each other; the first side plate (11) and the second side plate (12) are connected by screws (13); a sliding bearing (14) is sandwiched between the first side plate (11) and the second side plate (12); and the guide shaft (7) is sleeved in the sliding bearing (14).

4. The tightening tool according to claim 3, characterized in that: The first side plate (11) is provided with a first opening (111), the second side plate (12) is provided with a second opening (121), the sliding bearing (14) is inserted into the first opening (111) and the second opening (121), and the first opening (111) and the second opening (121) are in the shape of long strips.

5. The tightening tool according to claim 4, characterized in that: The first openings (111) correspond to the positioning sleeves (3) one by one, and the two groups of the first openings (111) are distributed in an eight-shaped pattern; the second openings (121) correspond to the positioning sleeves (3) one by one, and the two groups of the second openings (121) are distributed in an eight-shaped pattern.

6. The tightening tool according to claim 5, characterized in that: A bracket (15) is installed between the first side plate (11) and the second side plate (12), an adjusting bolt (16) is screwed onto the bracket (15), a plug-in plate (141) is installed on the outer wall of the sliding bearing (14), a sliding sleeve (18) is sleeved at the tail of the adjusting bolt (16), the plug-in plate (141) is plugged into the sliding sleeve (18), and the axis of the adjusting bolt (16) is perpendicular to the axis of the guide shaft (7).

7. The tightening tool according to claim 3, characterized in that: A one-way ratchet (17) is installed between the first side plate (11) and the second side plate (12); the wrench assembly (2) comprises a tightening gun (21); a rotating shaft (211) at the front end of the tightening gun (21) is connected to a rotating sleeve (4); an intermediate sleeve (9) is sleeved on the rotating shaft (211); the intermediate sleeve (9) is sleeved in the one-way ratchet (17); and one group of the screws (13) passes through the one-way ratchet (17).

8. The tightening tool according to claim 3, characterized in that: Positioning rings (20) are sleeved on both sides of the axis of the sliding bearing (14), wherein one group of the positioning rings (20) abuts against a side of the first side plate (11) away from the second side plate (12), and the other side of the positioning rings (20) abuts against a side of the second side plate (12) away from the first side plate (11).

9. The tightening tool according to claim 7, characterized in that: A ratchet sleeve (171) is rotatably mounted inside the one-way ratchet (17), and the ratchet sleeve (171) can only rotate to one side. A clamping portion (91) is formed at one end of the intermediate sleeve (9), and the clamping portion (91) is hexagonal and inserted into the ratchet sleeve (171). A sleeve ring (10) is sleeved on the outside of the rotating shaft (211), and the sleeve ring (10) is connected to the clamping portion (91), and the sleeve ring (10) abuts against the ratchet sleeve (171).

10. The tightening tool according to claim 9, characterized in that: A sleeve connection portion (92) is formed at one end of the intermediate sleeve (9), the sleeve connection portion (92) is cylindrical, the sleeve connection portion (92) is connected to a fixed sleeve (212) on the tightening gun (21), and the sleeve connection portion (92) is inserted into the fixed sleeve (212).

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