A connecting rod pin hole tool

Abstract

The present disclosure relates to the technical field of mechanical workpiece processing, and provides a connecting rod pin hole tool, which comprises a first inner positioning block, the circumferential direction of the first inner positioning block is provided with an inner limiting arc surface, the first inner positioning block is arranged in a first mounting hole, and the inner limiting arc surface is used for abutting against the inner wall of a first inner circular surface; a pin hitting rod is slidably arranged on the first inner positioning block, the sliding direction is along the tangential direction perpendicular to the inner limiting arc surface, the pin hitting rod is configured to abut against or cancel the abutment of a positioning pin against the first inner circular surface after sliding, and is used for positioning a mounting bearing bush through the positioning pin; a top piece is located on one side of the first inner positioning block, the top piece is arranged to slide along the radial direction of the inner limiting arc surface, and the top piece is configured to abut against or cancel the abutment of a first outer positioning surface after moving; and the interval between the first inner positioning block and the top piece is used for clamping a main shaft segment. Through the above technical scheme, the technical problem that the fixing effect of the existing connecting rod pin hole tool on the connecting rod is poor and the positioning precision is difficult to meet the production requirements, resulting in insufficient bearing bush installation precision and equipment performance decline is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of mechanical workpiece processing technology, and more specifically, to a connecting rod pin hole tooling. Background Technology

[0002] In the field of mechanical manufacturing, connecting rods, as key components in power equipment such as engines, directly affect the overall performance and reliability of the equipment due to their manufacturing precision. Bearing bushes are the part of the sliding bearing that contacts the shaft; they are typically made of wear-resistant materials and are semi-cylindrical in shape. Their function is to reduce friction and wear between the shaft and the bearing housing, improve the smoothness of equipment operation, and thus extend the service life of the equipment. During the manufacturing process of connecting rods, placing the copper bushing into the connecting rod bore is an extremely important step. This is because connecting rods must withstand enormous alternating loads during operation, and the copper bushing, with its excellent wear resistance and friction-reducing properties, can effectively reduce the coefficient of friction between the connecting rod and the shaft, ensuring the stability and efficiency of power transmission. This step requires extremely high positioning accuracy; precise positioning ensures that the copper bushing is installed accurately within the connecting rod bore.

[0003] However, the existing technologies used in practice have significant drawbacks. Firstly, the existing tooling is ineffective in securing the connecting rod, leading to displacement during machining. This not only affects the installation accuracy of the copper bushing but may also cause poor fit between the connecting rod and other components during subsequent use, resulting in equipment malfunctions. Secondly, the positioning accuracy of existing technologies is insufficient to meet increasingly demanding production requirements. Inaccurate positioning can lead to eccentricity issues after the copper bushing is installed, causing additional wear and energy consumption during power transmission, severely reducing equipment lifespan and efficiency. Therefore, developing a connecting rod pin hole tooling that effectively solves these problems is urgently needed. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a connecting rod pin hole tooling, which solves the technical problems of poor fixing effect of existing connecting rod pin hole tooling on connecting rods and difficulty in meeting production requirements, resulting in insufficient installation accuracy of copper bushings and reduced equipment performance.

[0005] According to one aspect, at least one embodiment of this disclosure provides a connecting rod pin hole fixture, wherein the connecting rod is divided into a main shank section and a large end section, the main shank section has a first inner circular surface, and the inner wall of the large end section has a second inner circular surface. After the main shank section and the large end section are assembled together, the first inner circular surface and the second inner circular surface together form a first mounting hole. This device is used to drive a positioning pin into the inner wall of the first mounting hole and to position and install a bearing bush by means of the positioning pin. The outer wall of the first inner circular surface extending radially outward has a first outer positioning surface, including:

[0006] The first inner positioning block has an inner limiting arc surface in its circumference. The first inner positioning block is used to pass through the first mounting hole. The inner limiting arc surface is used to abut against the inner wall of the first inner circular surface. The first inner positioning block has a guide groove for placing and guiding the positioning pin.

[0007] A hammer pin is slidably disposed in the guide groove. The hammer pin is configured to push the positioning pin against the first inner circular surface after sliding, thereby hammering the positioning pin into the first inner circular surface.

[0008] A top member is located on one side of the first inner positioning block. The top member is movable relative to the first inner positioning block and is configured to abut or release from the first outer positioning surface after movement, in order to prevent the main handle segment from shifting under the push of the hammer pin.

[0009] For example, at least one embodiment of this disclosure provides a connecting rod pin hole fixture, which further includes:

[0010] A base, wherein the first inner positioning block is disposed on the base, and the base has a first fixed position;

[0011] A positioning seat is adjustablely positioned at the first fixed position and located on one side of the inner limiting arc surface. The top member is movably mounted on the positioning seat and abuts against the first outer positioning surface after moving radially along the inner limiting arc surface.

[0012] For example, at least one embodiment of this disclosure provides a connecting rod pin hole fixture, wherein the other end of the main shank segment has a second mounting hole, and the connecting rod pin hole fixture further includes:

[0013] The second inner positioning block is disposed on the base and located on one side of the first inner positioning block. The second inner positioning block is used to insert into the second mounting hole to fix the end of the main handle segment where the second mounting hole is located.

[0014] For example, at least one embodiment of this disclosure provides a connecting rod pin hole fixture, wherein the outer wall of the large end section has a second outer positioning surface, the base also has a second fixing position, the second fixing position being located on one side of the first fixing position, and the connecting rod pin hole fixture further includes:

[0015] A top block is disposed on the base. The top block is configured such that when the large end segment is sleeved on the first inner positioning block, the second inner circular surface fits against the inner limiting arc surface. The top block is used to simultaneously abut against both ends of the second inner circular surface. The top block and the top member are used together to clamp the large end segment from both sides.

[0016] For example, at least one embodiment of this disclosure provides a connecting rod pin hole fixture, wherein the base has three adjacent first fixing holes, the first fixing holes on both sides and the first fixing hole in the middle respectively form the first fixing position and the second fixing position, and the positioning seat has two second fixing holes at both ends. The positioning seat is configured such that the second fixing hole at one end of the positioning seat always cooperates with the first fixing hole in the middle, so that the positioning seat swings vertically around this axis, and after swinging, the positioning seat is located in the first fixing position or the second fixing position.

[0017] For example, at least one embodiment of this disclosure provides a connecting rod pin hole tooling, wherein the first inner positioning block further has a limiting notch platform, the limiting notch platform and the inner limiting arc surface are connected end to end in the circumferential direction of the first inner positioning block; the pin rod slides in a direction perpendicular to the bottom wall of the limiting notch platform.

[0018] For example, at least one embodiment of this disclosure provides a connecting rod pin hole tooling, wherein the hammer pin has a large impact head at one end located within the limiting notch platform, and the large impact head is configured such that after being driven by the hammer pin to slide towards the first inner circular surface or the second inner circular surface, the large impact head abuts against the bottom wall of the limiting notch platform.

[0019] For example, at least one embodiment of this disclosure provides a connecting rod pin hole tooling, wherein an extension channel is provided on the side wall of the top block, and the length direction of the extension channel coincides with the length direction of the pin rod.

[0020] For example, at least one embodiment of this disclosure provides a connecting rod pin hole fixture, wherein the top part is threadedly connected to the positioning seat, and the bottoms of the first inner positioning block and the second inner positioning block are both threadedly connected to the base.

[0021] For example, at least one embodiment of this disclosure provides a connecting rod pin hole fixture, wherein the outer wall of the first inner positioning block is provided with an outlet groove along the axial direction. The outlet groove is configured to provide an exit passage for the positioning pin installed on the first inner circular surface or the second inner circular surface after the main shank section or the large end section is moved out. The fixture also includes a cover plate, which is movable along the axial direction of the first inner positioning block and is used to abut against the top end of the large end section after the movement. The cover plate is bolted to the base with adjustable height.

[0022] The beneficial effects of the embodiments disclosed herein are as follows:

[0023] In this disclosure, the first inner positioning block penetrates the first mounting hole and abuts against the inner wall of the first inner circular surface through its inner limiting arc surface, providing internal radial positioning support for the connecting rod. This allows the connecting rod to remain stable in the radial direction of the first mounting hole in the initial stage, providing an accurate positional basis for subsequent installation of the positioning pin. The movable or swingable setting of the pin rod on the first inner positioning block allows it to be flexibly adjusted according to the requirements of the positioning pin installation position. When the pin rod abuts against the first inner circular surface, the position of the positioning pin can be accurately determined, improving the accuracy of the positioning pin installation. At the same time, the pin rod can be released from contact with the first inner circular surface after the positioning pin is installed, avoiding obstruction to subsequent operations and ensuring the convenience and flexibility of tooling use. The top piece cooperates with the first inner positioning block and abuts against the first outer positioning surface to achieve axial fixation of the main stem section of the connecting rod. This method of positioning and fixing the connecting rod from the outside, combined with the internal positioning of the first inner positioning block, forms a comprehensive positioning system. Compared with the prior art, it effectively avoids radial and axial displacement of the connecting rod during the installation of the positioning pin. The improved precision of the locating pin installation allows the connecting rod to better cooperate with other components during subsequent assembly, reducing assembly errors and equipment failures caused by inaccurate locating pin installation. Simultaneously, it increases production efficiency, reduces production costs, extends equipment lifespan, and enhances the stability and reliability of the entire production system. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0025] Figure 1 This is a schematic diagram of the independent structure of the link in one embodiment of this disclosure;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of a connecting rod pin hole tooling in one embodiment;

[0027] Figure 3 for Figure 1 A schematic diagram of the base structure of a connecting rod pin hole tooling in one embodiment;

[0028] Figure 4 for Figure 1 Another structural schematic diagram of a connecting rod pin hole tooling in the embodiment;

[0029] Figure 5 for Figure 4 Schematic diagram of the internal partial structure;

[0030] Figure 6 for Figure 5 A partially enlarged structural diagram of section A in the middle;

[0031] Figure 7 for Figure 1 Another structural schematic diagram in the embodiment.

[0032] In the diagram: Connecting rod-1, main handle section-101, large end section-102, first inner circular surface-103, second inner circular surface-104, first mounting hole-105, first outer positioning surface-106, second mounting hole-107, second outer positioning surface-108, first inner positioning block-2, inner limiting arc surface-201, limiting notch platform-202, outlet groove-203, guide slide groove-204, hammer pin-3, impacted large end-301, top piece-4, base-5, first fixed position-501, second fixed position-502, first fixed hole-503, positioning seat-6, second fixed hole-601, second inner positioning block-7, hand-held operating lever-701, top block-8, extension channel-801, positioning pin-9, cover plate-10. Detailed Implementation

[0033] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0034] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0035] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0036] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0038] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] like Figures 1-7 As shown, it illustrates a connecting rod pin hole fixture according to an embodiment of the present disclosure.

[0040] The purpose of this connecting rod pin hole fixture is to precisely position the connecting rod 1 to complete the installation of the positioning pin on the first inner circular surface 103 of the connecting rod 1. The connecting rod 1 consists of a main shank section 101 and a large end section 102. The main shank section 101 has a first inner circular surface 103, and the inner wall of the large end section 102 has a second inner circular surface 104. The two are joined together to form a first mounting hole 105, and the outer wall of the first inner circular surface 103 extending radially outward has a first outer positioning surface 106. The fixture mainly includes a first inner positioning block 2, a pin rod 3, and a top piece 4. The first inner positioning block 2 has an inner limiting arc surface 201 in its circumferential direction. During operation, the first inner positioning block 2 is inserted into the first mounting hole 105, so that the inner limiting arc surface 201 is in close contact with the inner wall of the first inner circular surface 103. This operation achieves positioning inside the first mounting hole 105 of the connecting rod 1, ensuring that the connecting rod 1 will not be displaced in the radial direction of the first mounting hole 105 during subsequent processing.

[0041] The locking pin 3 is movable or swingable on the first inner positioning block 2. After the first inner positioning block 2 completes the initial positioning of the connecting rod 1, the locking pin 3 is controlled to slide according to the position requirements of the positioning pin installation. When the locking pin 3 slides to abut against the first inner circular surface 103, the positioning pin is installed on the first inner circular surface 103 by using an external positioning pin installation device and the positioning action of the locking pin 3. After the positioning pin is installed, the locking pin 3 is slid back to its initial position to cancel the abutment against the first inner circular surface 103, so as to facilitate subsequent operations on the connecting rod 1 or to remove the connecting rod 1 from the tooling. The top piece 4 is located on one side of the first inner positioning block 2 and is movable relative to the first inner positioning block 2. After the first inner positioning block 2 passes through the first mounting hole 105, the top piece 4 is driven to move towards the first inner positioning block 2 until the top piece 4 abuts against the first outer positioning surface 106. At this time, the gap between the first inner positioning block 2 and the top piece 4 precisely clamps the main shank section 101, thus fixing the main shank section 101 of the connecting rod 1. This fixing method can prevent the connecting rod 1 from shifting in the axial direction of the first mounting hole 105 during the installation of the positioning pin, further improving the accuracy of the positioning pin installation.

[0042] The first inner positioning block 2 passes through the first mounting hole 105 and abuts against the inner wall of the first inner circular surface 103 through the inner limiting arc surface 201, providing internal radial positioning support for the connecting rod 1. This allows the connecting rod 1 to remain stable in the radial direction of the first mounting hole 105 in the initial stage, providing an accurate positional basis for subsequent installation of the positioning pin. The movable or swingable setting of the pin rod 3 on the first inner positioning block 2 allows it to be flexibly adjusted according to the requirements of the positioning pin installation position. When the pin rod 3 abuts against the first inner circular surface 103, the position of the positioning pin can be accurately determined, improving the accuracy of the positioning pin installation. At the same time, the pin rod 3 can be released from contact with the first inner circular surface 103 after the positioning pin installation is completed, avoiding obstruction to subsequent operations and ensuring the convenience and flexibility of tooling use.

[0043] The top piece 4 cooperates with the first inner positioning block 2, and by abutting against the first outer positioning surface 106, it achieves axial fixation of the main stem section 101 of the connecting rod 1. This method of externally positioning and fixing the connecting rod 1, combined with the internal positioning of the first inner positioning block 2, forms a comprehensive positioning system. Compared with the prior art, this effectively avoids radial and axial displacement of the connecting rod 1 during the installation of the positioning pin. Due to the improved accuracy of the positioning pin installation, the connecting rod 1 can better cooperate with other components in subsequent assembly processes, reducing assembly errors and equipment failures caused by inaccurate positioning pin installation. At the same time, it improves production efficiency, reduces production costs, extends the service life of equipment, and enhances the stability and reliability of the entire production system.

[0044] In some examples, the base 5 of the connecting rod pin hole fixture has three adjacent first fixing holes 503. The first fixing holes 503 on both sides, together with the middle first fixing hole 503, form the first fixing position 501 and the second fixing position 502. The positioning seat 6 has two second fixing holes 601 at both ends. The second fixing hole 601 at one end is always fixed to the middle first fixing hole 503 by a fastener, allowing the positioning seat 6 to swing horizontally around this fixed point. When the positioning seat 6 swings to the first fixing position 501, the positioning seat 6 is located on one side of the inner limiting arc surface 201 of the first inner positioning block 2. The top member 4 is connected to the positioning seat 6 by a thread and can move horizontally along the radial direction of the inner limiting arc surface 201. At this time, the top member 4 is driven to move towards the first inner positioning block 2 until it abuts against the first outer positioning surface 106 of the main shank section 101, thus achieving the clamping of the main shank section 101 by the first inner positioning block 2 and the top member 4. When the positioning seat 6 swings to the second fixed position 502, its position corresponds to the setting area of ​​the top block 8 in claim 4, providing a structural basis for the clamping of the large head section 102.

[0045] The base 5 engages with the second fixing hole 601 of the positioning seat 6 through three first fixing holes 503, forming a swingable positioning structure. This allows the positioning seat 6 to switch between the first fixing position 501 and the second fixing position 502, accommodating the positioning requirements of both the main shank section 101 and the large end section 102. The threaded connection between the top piece 4 and the positioning seat 6 allows for radial position fine-tuning, ensuring precise contact with the first outer positioning surface 106. This solves the problem of poor adaptability caused by the non-adjustable positioning components in the prior art, and improves the tooling's versatility for connecting rods of different specifications.

[0046] In some examples, the other end of the main shank segment 101 is provided with a second mounting hole 107, and a second inner positioning block 7 is fixedly installed on the base 5 on one side of the first inner positioning block 2. The shape of the second inner positioning block 7 matches the second mounting hole 107 and can be inserted into the second mounting hole 107. The cooperation of the two fixes the end of the main shank segment 101 where the second mounting hole 107 is located. The second inner positioning block 7 and the first inner positioning block 2 work together to achieve axial positioning of the connecting rod from both ends of the main shank segment 101, preventing the connecting rod from moving along the axial direction of the first mounting hole 105 during processing. The second inner positioning block 7 and the first inner positioning block 2 form a double-pivot positioning structure that supports both ends of the main shank segment 101. Compared with single-end clamping, this significantly enhances the axial stability of the connecting rod and solves the problem of connecting rod swaying caused by a single fixed point in the prior art. It is especially suitable for working conditions that bear alternating loads, ensuring that the overall position of the connecting rod remains unchanged during the installation of the positioning pin or installation process.

[0047] In some examples, the outer wall of the large end segment 102 is provided with a second outer positioning surface 108, and the second fixed position 502 of the base 5 is located on one side of the first fixed position 501 and in the sliding direction of the pin 3. The top block 8 is fixedly mounted on the base 5. When the large end segment 102 is fitted onto the first inner positioning block 2, the second inner circular surface 104 fits against the inner limiting arc surface 201, and the two ends of the top block 8 abut against the two ends of the second inner circular surface 104, forming support for the inner wall of the large end segment 102. At the same time, when the positioning seat 6 swings to the second fixed position 502, the top piece 4 clamps the large end segment 102 from both sides of the second outer positioning surface 108 on the outer wall and the second inner circular surface 104 on the inner wall, respectively. An extension channel 801 is opened on the side wall of the top block 8, the length direction of which coincides with the length direction of the pin 3, providing clearance space for the sliding of the pin 3 and avoiding interference of the top block 8 with the movement of the pin 3. The top block 8 and the top piece 4 form a double-sided clamping of the large end section 102, combining inner wall abutment and outer wall positioning, thus solving the problem of connecting rod tilting caused by only one-sided fixing in the prior art. The extension channel 801 ensures that the sliding of the pin 3 in the area of ​​the large end section 102 is unimpeded, allowing the pin 3 to pass through the first mounting hole 105 of the main handle section 101 and the large end section 102 for positioning, realizing multi-dimensional constraints on the overall structure of the connecting rod and improving the rigidity of the positioning system.

[0048] In some examples, the first inner positioning block 2 has a circumferentially provided limiting notch platform 202, which is connected end-to-end with the inner limiting arc surface 201 in the circumferential direction, forming a discontinuous cylindrical surface structure surrounding the first inner positioning block 2. The striking pin 3 slides in a direction perpendicular to the bottom wall of the limiting notch platform 202, and its end located inside the limiting notch platform 202 has a striking head 301. When it is necessary to install the positioning pin on the first inner circular surface 103, the striking pin 3 is driven to slide towards the first inner circular surface 103, and the striking head 301 moves with the striking pin 3 and abuts against the bottom wall of the limiting notch platform 202, limiting the sliding stroke of the striking pin 3 and ensuring that the other end of the striking pin 3 accurately abuts against the target position of the first inner circular surface 103. After the positioning pin is installed, the striking pin 3 is driven in the reverse direction, the striking head 301 disengages from the bottom wall, and the striking pin 3 retracts into the limiting notch platform 202. The limiting notch platform 202 provides a sliding guide path for the striking pin 3, preventing it from deviating during movement and ensuring the accuracy of the positioning pin's position. The contact structure between the impact-bearing large head 301 and the bottom wall of the limiting notch platform 202 forms a mechanical limit, replacing the positioning method that relies on manual judgment in the prior art. This eliminates human error, standardizes the extension length of the striking pin 3, and ensures the consistency of the positioning pin's position during multiple processing steps.

[0049] In some examples, the top piece 4 is threadedly connected to the positioning seat 6. Rotating the top piece 4 allows it to move axially, achieving contact or separation with the first outer positioning surface 106 or the second outer positioning surface 108. The bottoms of the first inner positioning block 2 and the second inner positioning block 7 are both threadedly connected to the base 5, facilitating disassembly and replacement. A hand-held operating lever 701 is provided at the top, allowing operators to quickly adjust the insertion depth or rotation angle of the inner positioning blocks, improving clamping efficiency. The threaded connection structure provides the top piece 4 and the inner positioning blocks with precise position adjustment capabilities, adapting to the positioning needs of connecting rods of different sizes. Compared to the rigid connections of existing technologies, this significantly improves the adaptability of the tooling. The hand-held operating lever 701 combines mechanical positioning with a manual operation interface, simplifying the clamping process, reducing auxiliary positioning time, and is particularly suitable for rapid changeovers in assembly line operations, reducing the operational intensity of workers.

[0050] In addition, a top cover plate is provided, which moves up and down above the end face of the first inner positioning block 2 and is bolted to the base 5, thus restricting the axial misalignment of the connecting rod. The first inner positioning block 2 has an opening at the lower end of the pin hole, which facilitates the removal of the pin after drilling and addresses the problem of the bearing bush being unable to be easily disassembled due to the pin protruding from the arc surface of the connecting rod's large hole after the pin is hammered.

[0051] In summary, the swingable structure of the base 5 and the positioning seat 6 constructs a double-sided positioning foundation for the main handle section 101 and the large head section 102; the second inner positioning block 7 and the top block 8 form a multi-point clamping structure from both ends of the connecting rod and the inner and outer walls, which enhances the stability of the positioning system; the limiting notch platform, the impact-bearing large head, and the extended channel solve the problems of precise guidance and ease of operation of the hammer pin 3, while the threaded connection and the operating rod 701 improve the practicality and versatility of the tooling.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A connecting rod pin hole fixture, wherein the connecting rod (1) is divided into a main shank section (101) and a large end section (102), the main shank section (101) has a first inner circular surface (103), the inner wall of the large end section (102) has a second inner circular surface (104), and after the main shank section (101) and the large end section (102) are assembled together, the first inner circular surface (103) and the second inner circular surface (104) together form a first mounting hole (105), the device is used to nail a positioning pin (9) into the inner wall of the first mounting hole (105), and is used to position and install a bearing bush by means of the positioning pin (9), wherein the outer wall of the first inner circular surface (103) extending radially outward has a first outer positioning surface (106), characterized in that, include: The first inner positioning block (2) has an inner limiting arc surface (201) in its circumference. The first inner positioning block (2) is used to pass through the first mounting hole (105). The inner limiting arc surface (201) is used to abut against the inner wall of the first inner circular surface (103). The first inner positioning block (2) has a guide groove (204) for placing and guiding the positioning pin (9). A hammer pin (3) is slidably disposed in the guide groove (204). The hammer pin (3) is configured to push the positioning pin (9) to abut against the first inner circular surface (103) after sliding, so as to hammer the positioning pin (9) into the first inner circular surface (103). Top member (4), the top member (4) is located on one side of the first inner positioning block (2), the top member (4) is movable relative to the first inner positioning block (2), and the top member (4) is configured to abut or cancel abut against the first outer positioning surface (106) after moving, in order to prevent the main handle section (101) from shifting under the push of the hammer rod (3).

2. The connecting rod pin hole fixture according to claim 1, characterized in that, The connecting rod pin hole fixture also includes: The base (5) has the first inner positioning block (2) disposed on the base (5) and the base (5) has a first fixed position (501). Positioning seat (6), the positioning seat (6) is adjustablely positioned at the first fixed position (501), and the positioning seat (6) is located on one side of the inner limiting arc surface (201). The top member (4) is movably positioned on the positioning seat (6). After the top member (4) moves radially along the inner limiting arc surface (201), it abuts against the first outer positioning surface (106).

3. The connecting rod pin hole fixture according to claim 2, characterized in that, The other end of the main shank section (101) has a second mounting hole (107), and the connecting rod pin hole fixture further includes: The second inner positioning block (7) is disposed on the base (5) and located on one side of the first inner positioning block (2). The second inner positioning block (7) is used to insert into the second mounting hole (107) so as to fix the end of the main handle section (101) where the second mounting hole (107) is located.

4. The connecting rod pin hole fixture according to claim 2, characterized in that, The outer wall of the large end section (102) has a second outer positioning surface (108), and the base (5) also has a second fixing position (502), which is located on one side of the first fixing position (501). The connecting rod pin hole tooling further includes: Top block (8), the top block (8) is disposed on the base (5), the top block (8) is configured such that when the large end segment (102) is sleeved on the first inner positioning block (2), the second inner circular surface (104) is in contact with the inner limiting arc surface (201), the top block (8) is used to simultaneously abut against both ends of the second inner circular surface (104), the top block (8) and the top member (4) are used together to clamp the large end segment (102) from both sides.

5. A connecting rod pin hole fixture according to claim 4, characterized in that, The base (5) has three adjacent first fixing holes (503). The first fixing holes (503) on both sides and the first fixing hole (503) in the middle form the first fixing position (501) and the second fixing position (502), respectively. The positioning seat (6) has two second fixing holes (601) at both ends. The positioning seat (6) is configured such that the second fixing hole (601) at one end of the positioning seat (6) is always engaged with the first fixing hole (503) in the middle, so that the positioning seat (6) swings vertically around this axis. After swinging, the positioning seat (6) is located in the first fixing position (501) or the second fixing position (502).

6. The connecting rod pin hole fixture according to claim 1, characterized in that, The first inner positioning block (2) also has a limiting notch platform (202), the limiting notch platform (202) and the inner limiting arc surface (201) are connected end to end in the circumferential direction of the first inner positioning block (2); the hammer rod (3) slides in a direction perpendicular to the bottom wall of the limiting notch platform (202).

7. A connecting rod pin hole fixture according to claim 6, characterized in that, The hammer pin (3) has a large impact head (301) at one end located inside the limiting notch platform (202). The large impact head (301) is configured such that after being driven by the hammer pin (3) to slide towards the first inner circular surface (103) or the second inner circular surface (104), the large impact head (301) abuts against the bottom wall of the limiting notch platform (202).

8. A connecting rod pin hole fixture according to claim 4, characterized in that, An extension channel (801) is provided on the side wall of the top block (8), and the length direction of the extension channel (801) coincides with the length direction of the hammer rod (3).

9. A connecting rod pin hole fixture according to claim 3, characterized in that, The top piece (4) is threadedly connected to the positioning seat (6), and the bottoms of the first inner positioning block (2) and the second inner positioning block (7) are threadedly connected to the base (5).

10. A connecting rod pin hole fixture according to claim 3, characterized in that, The outer wall of the first inner positioning block (2) is provided with an outlet groove (203) along the axial direction. The outlet groove (203) is configured to provide an exit passage for the positioning pin (9) installed on the first inner circular surface (103) or the second inner circular surface (104) after the main handle section (101) or the large end section (102) is moved out. The block also includes a cover plate (10), which moves along the axial direction of the first inner positioning block (2) and is used to abut against the top end of the large end section (102) after moving. The cover plate (10) is bolted to the base (5) with adjustable height.

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