A bush press fitting device and press fitting method

Abstract

This invention relates to the field of bushing press-fitting technology, and discloses a bushing press-fitting device comprising: a mandrel for installing the bushing and having a positioning element for circumferential positioning of the bushing; a guide head detachably fixedly installed at the end of the mandrel and used for limiting and guiding the press-fitting of the bushing; a transmission component coaxially fixed to the mandrel; a push rod sleeve sleeved on the outside of the transmission component and having an anti-rotation structure between the push rod sleeve and the transmission component, the end of the push rod sleeve opposite to the guide head having a reduced diameter section extending into an adjacent hole; and a drive structure for driving the transmission component and the mandrel to move axially. A bushing press-fitting method includes cooling the bushing, pre-installation positioning, alignment support, press-fitting operation, and resetting and removing the part. This invention can be adapted to limited working spaces such as large engine cylinder blocks, effectively reducing the intensity of manual operation, accurately controlling the axial assembly dimensions of the bushing and the alignment angle of the oil hole, avoiding the oil hole misalignment from affecting the flow of the medium, and significantly improving assembly efficiency and assembly quality.

Description

Technical Field

[0001] This invention relates to the field of bushing pressing technology, and specifically to a bushing pressing device and pressing method. Background Technology

[0002] In the production and assembly of large engine blocks for heavy-duty trucks and ships, the cylinder block is densely covered with various assembly holes, such as cam holes. Most of these holes are located in confined spaces such as component interlayers and inside the engine block, requiring press-fitting of directional bushings made of brass or aluminum alloy. The interference fit between the bushing and the assembly hole is 0.09mm to 0.14mm. Currently, the industry standard process involves liquid nitrogen cooling of the bushing followed by manual hammering. Figure 1 and Figure 2 As shown: After cooling, the bushing is inserted into the mandrel. The angle of the bushing oil hole is manually calibrated, and then the mandrel end is tapped with a copper rod to complete the assembly. Because both ends of the assembly hole are rough surfaces, the assembly position is judged entirely by visual inspection, resulting in large axial assembly dimensional errors in the bushing and making it impossible to guarantee assembly accuracy.

[0003] The internal structure of the engine block is complex, and the working space for most of the assembly holes is limited. The effective stroke of traditional hammering is greatly shortened, and the force of a single hammering is insufficient, so assembly can only be completed by repeated hammering. In addition, the bushing has a large interference fit. During the process from taking it out of liquid nitrogen to inserting it into the assembly hole, the bushing temperature rises rapidly and the outer diameter expands, which further increases the actual interference fit during the assembly stage. This not only leads to extremely high labor intensity for manual operation, but also seriously reduces the overall assembly efficiency, making it impossible to meet the requirements of large-scale production.

[0004] In existing processes, the alignment of the bushing oil holes and the cylinder block oil holes relies entirely on manual alignment, making it difficult to control angular deviations. If the alignment error is too large, it will reduce the flow area of ​​the oil holes and cause abnormal lubricating oil flow, directly affecting the engine lubrication system and the overall engine performance, and posing a potential equipment failure hazard. Summary of the Invention

[0005] The purpose of this invention is to provide a bushing pressing device that is suitable for confined working spaces, enables precise positioning of the bushing axial dimension and oil hole angle, reduces manual operation intensity, and improves pressing efficiency and assembly quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A bushing pressing device, comprising: A mandrel for mounting bushings and equipped with positioning elements for circumferential positioning of the bushings; The guide head is detachably and fixedly mounted on the end of the spindle and is used for limiting and pressing the bushing. The transmission component is coaxially and fixedly connected to the spindle. The push rod sleeve is sleeved on the outside of the transmission component and has an anti-rotation structure between it and the transmission component. The end of the push rod sleeve facing away from the guide head has a reduced diameter section that extends into the adjacent hole and is coaxial with the hole with a small gap for centering. A drive structure used to drive transmission components and spindles to move axially.

[0007] This device is suitable for press-fitting bushings in confined operating spaces inside components such as cylinder blocks. It is suitable for press-fitting multiple coaxial bushings of the same size. When there are multiple assembly holes, the last assembly hole can be installed using existing methods, such as manual tapping. Because it is located on the outermost side, there is no problem of inconvenient operation due to limited space.

[0008] The push rod sleeve extends into the adjacent hole of the assembled body using the reduced diameter section at the end. The anti-rotation structure between the push rod sleeve and the transmission component restricts the rotation of the transmission component, ensuring that the transmission component only moves axially. With the help of the drive structure, the mandrel and bushing can be fed smoothly. The positioning component on the mandrel can circumferentially limit the bushing, and the guide head can prevent the bushing from coming out during the assembly process and play a guiding role. The overall structure can complete the bushing pressing operation in a limited space, solving the problem that traditional manual hammering is difficult to carry out in narrow areas.

[0009] Preferably, the positioning element is a ball screw, which is fixed on the mandrel and mates with the oil hole of the bushing.

[0010] Preferably, the guide head and the end of the mandrel are connected by a threaded detachable connection.

[0011] Preferably, the transmission component is a screw, and the driving structure includes a nut and a ratchet wrench; the nut and the screw are threaded together, and the ratchet wrench is used to drive the nut to rotate circumferentially.

[0012] Preferably, a limiting sleeve is fitted on the push rod sleeve; the end of the limiting sleeve facing the guide head protrudes inward to form an inner edge, and the end of the nut facing away from the guide head protrudes outward to form an outer edge, the outer diameter of the outer edge being smaller than the inner diameter of the inner edge.

[0013] Preferably, the anti-rotation structure includes an anti-rotation pin, which is fixedly installed on the top rod sleeve; the transmission component has an anti-rotation groove along the axial direction, and the end of the anti-rotation pin is slidably assembled in the anti-rotation groove.

[0014] Preferably, a bearing seat is fixedly installed on the outside of the top rod sleeve; bearing sections are provided at both ends of the bearing seat, axial adjustment pins are installed on the bearing seat, and angle adjustment pins are installed on the bearing sections.

[0015] The purpose of this invention is to provide a bushing press-fitting method, which uses the above-mentioned press-fitting device to complete the labor-saving press-fitting of bushings in a limited space, ensuring the assembly dimensions and oil hole alignment accuracy, simplifying the operation process, and adapting to the needs of batch assembly.

[0016] To achieve the above objectives, the present invention adopts the following technical solution: A bushing pressing method, using the aforementioned bushing pressing device, includes the following steps: S0, Pre-adjustment positioning: The axial and angular positioning of the pre-adjustment device is based on the first-installed end face bushing; S1, Cooling Bushing: The bushing is cooled by liquid nitrogen, causing it to shrink and deform due to cold. S2. Pre-installation positioning: Place the bushing on the end of the spindle, and complete the angle positioning by cooperating with the oil hole of the bushing through the positioning part. Then tighten and fix the guide head. S3. Alignment support: Insert the top rod sleeve into the adjacent hole of the assembled part; S4. Pressing operation: The drive structure drives the transmission components and spindle to move axially, pressing the bushing into the assembly hole; S5. Reset and remove parts: After assembly, disassemble the guide head, reverse the drive structure to drive the transmission components and the spindle to reset.

[0017] This method first uses liquid nitrogen to cool and shrink the bushing, reducing the interference resistance between the bushing and the assembly hole. This avoids the problem of the bushing rapidly expanding and increasing in outer diameter after being removed from the low-temperature environment, which would greatly increase the difficulty of press-fitting. Then, the entire process of bushing pre-installation positioning, device alignment and support, axial press-fitting, and resetting and removing the part is completed in sequence. The operation is completed in a limited space by relying on the aforementioned press-fitting device, eliminating the manual hammering method. The process is continuous and simple to operate, which reduces labor intensity and can stably ensure the alignment accuracy of the bushing oil hole and the axial assembly dimensions. The overall assembly efficiency is much higher than the traditional manual hammering process, and it is suitable for batch press-fitting of bushings such as cam holes in automobile and ship engine cylinder blocks.

[0018] Preferably, in step S3, a bearing seat is fixed on the outer side of the top rod sleeve, and bearing sections are provided at both ends of the bearing seat. An axial adjusting pin is installed on the bearing seat, and an angle adjusting pin is installed on the bearing section. The top rod sleeve is inserted into the adjacent hole of the assembled body, and the axial adjusting pin is adjusted to contact the blank surface at the end of the mounting hole, and the angle adjusting pin contacts the two sides of the bearing seat at the corresponding position.

[0019] Preferably, in step S0, when pre-adjusting the axial and angular positioning, the bushing pressing device is adjusted to the state of the bushing being assembled, the bushing pressing device is placed in the limited space adjacent to the end face, and then the axial adjusting pin is adjusted to contact and lock with the blank surface at the end of the mounting hole, and the angular adjusting pin is adjusted to contact and lock with the two sides corresponding to the bearing seat.

[0020] This invention effectively solves the assembly problem of bushings in confined spaces. During operation, the operator only needs to reciprocate the ratchet wrench to complete the pressing. The device structure can accurately ensure the axial assembly depth of the bushing and the alignment accuracy of the oil hole, thus improving the assembly quality. At the same time, the use of trapezoidal threads in conjunction with the ratchet wrench to transmit torque greatly reduces the operating load. Compared with the traditional manual hammering method, the overall assembly efficiency is also significantly improved. Attached Figure Description

[0021] Figure 1 A schematic diagram of the existing manual hammering installation of bushings; Figure 2 for Figure 1 A sectional view; Figure 3 This is a schematic diagram of the structure of the present invention; Figure 4 This is a cross-sectional view of the present invention; Figure 5 This is a diagram showing the usage state of the present invention; Figure 6 for Figure 5 Partial sectional view.

[0022] Among them, the spindle 1, positioning component 2, guide head 3, transmission component 4, push rod sleeve 5, diameter reduction section 6, nut 7, ratchet wrench 8, limit sleeve 9, inner edge 10, outer edge 11, anti-rotation groove 12, bearing seat 13, bearing section 14, bushing 15, and mounting hole 16 are all included. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] like Figure 3-6 A bushing pressing device, comprising: The mandrel 1 is used to install the bushing 15 and is provided with a positioning element 2 for circumferential positioning of the bushing 15; Guide head 3 is detachably and fixedly installed at the end of spindle 1 and is used to limit and press-fit guide bushing 15; Transmission component 4 is coaxially fixedly connected to spindle 1; The push rod sleeve 5 is sleeved on the outside of the transmission component 4 and has an anti-rotation structure between it and the transmission component 4. The end of the push rod sleeve 5 facing away from the guide head 3 has a reduced diameter section 6 that extends into the adjacent hole and is coaxial with the hole with a small gap for centering. The drive structure is used to drive the transmission component 4 and the spindle 1 to move axially.

[0025] This device is suitable for bushing press-fitting in narrow operating spaces inside components such as cylinder blocks. It is suitable for bushing press-fitting in scenarios with multiple coaxial mounting holes 16 of the same size. When multiple assembly holes are present, the outermost assembly hole has sufficient working space, and the existing manual hammering process can be used to complete the assembly.

[0026] The push rod sleeve 5 extends into the adjacent hole of the assembled body using the end-diameter reduction section 6. The anti-rotation structure between the push rod sleeve 5 and the transmission component 4 restricts the rotation of the transmission component 4, ensuring that the transmission component 4 only moves axially. With the help of the drive structure, the mandrel 1 and bushing 15 can be fed smoothly. The positioning component 2 on the mandrel 1 can circumferentially limit the bushing 15, and the guide head 3 can prevent the bushing 15 from coming out during the assembly process and play a guiding role. The overall structure can complete the bushing pressing operation in a limited space, solving the problem that traditional manual hammering is difficult to carry out in narrow areas.

[0027] Furthermore, the positioning element 2 is a ball screw, which is fixed to the mandrel 1 and mates with the oil hole of the bushing 15. By limiting the positioning element 2 to a ball screw fixed on the mandrel 1, and utilizing the engagement of the ball screw with the oil hole of the bushing 15, the circumferential angle of the bushing 15 can be precisely locked, replacing the traditional method of manually aligning the oil hole by eye. This effectively reduces the oil hole alignment error and avoids problems such as reduced oil flow area and abnormal lubricating oil flow caused by misalignment between the oil hole of the bushing 15 and the oil hole of the workpiece, ensuring the normal operation of equipment such as engines. At the same time, this positioning structure is simple and reliable, and can continuously maintain the angle of the bushing 15 throughout the press-fitting process.

[0028] Furthermore, the guide head 3 and the end of the mandrel 1 are connected by a threaded detachable connection. This threaded detachable connection allows for quick tightening of the guide head 3 during assembly to limit the bushing 15, preventing displacement or detachment during press-fitting. After assembly, the guide head 3 can be easily disassembled for subsequent device repositioning and removal. The disassembly and assembly process is simple, suitable for assembly line operations, and improves the convenience and efficiency of the overall assembly process. The guide head 3 can be made of nylon.

[0029] Furthermore, the transmission component 4 is a screw, and the driving structure includes a nut 7 and a ratchet wrench 8; the nut 7 is threadedly engaged with the screw, and the ratchet wrench 8 is used to drive the nut 7 to rotate circumferentially. The screw and the nut 7 form a threaded transmission pair, and the ratchet wrench 8 drives the nut 7 to rotate circumferentially, which, combined with the anti-rotation structure, converts the screw into axial linear motion; the threaded transmission can amplify the driving torque, and the reciprocating rotation of the ratchet wrench 8 changes the traditional copper rod striking operation mode, greatly reduces the intensity of manual operation, and solves the defects of laborious manual striking and insufficient force due to short striking stroke when the interference is large, thus realizing labor-saving press fitting in a confined space.

[0030] Furthermore, a limiting sleeve 9 is fitted on the push rod sleeve 5; the end of the limiting sleeve 9 facing the guide head 3 protrudes inward to form an inner edge 10, and the end of the nut 7 facing away from the guide head 3 protrudes outward to form an outer edge 11. The outer diameter of the outer edge 11 is smaller than the inner diameter of the inner edge 10. By setting the limiting sleeve 9 on the push rod sleeve 5, and using the inner edge 10 of the limiting sleeve 9 to form a limiting fit with the outer edge 11 of the nut 7, and the outer diameter of the outer edge 11 being smaller than the inner diameter of the inner edge 10, the axial position of the nut 7 can be limited and constrained during the rotational feeding process of the nut 7, avoiding excessive displacement or wobble of the nut 7, ensuring that the nut 7 and the screw always remain coaxial during the thread transmission process, improving transmission stability and pressing accuracy, and preventing the bushing 15 assembly dimensions from exceeding tolerances due to component misalignment.

[0031] Furthermore, the anti-rotation structure includes an anti-rotation pin, which is fixedly installed on the top rod sleeve 5; the transmission component 4 has an anti-rotation groove 12 along the axial direction, and the end of the anti-rotation pin is slidably fitted into the anti-rotation groove 12. The anti-rotation structure consists of an anti-rotation pin fixed on the top rod sleeve 5 and an anti-rotation groove 12 on the transmission component 4. The end of the anti-rotation pin is slidably fitted into the anti-rotation groove 12, which can completely restrict the transmission component 4 from rotating with the nut 7, ensuring that the transmission component 4 only moves axially when the nut 7 rotates, thus ensuring smooth and controllable pressing action; it can also limit the maximum axial movement distance of the transmission component 4 by relying on the stroke range of the anti-rotation groove 12, accurately controlling the axial assembly depth of the bushing 15, solving the problem of large dimensional errors caused by relying on visual judgment of assembly position in traditional processes, and ensuring that the assembly dimensions meet the design requirements.

[0032] Furthermore, a bearing seat 13 is fixedly installed on the outer side of the top rod sleeve 5; bearing sections 14 are provided at both ends of the bearing seat 13, and axial adjustment pins are installed on the bearing seat 13, while angle adjustment pins are installed on the bearing sections 14. The bearing seat 13 with bearing sections 14 is provided on the outer side of the top rod sleeve 5. The bearing seat 13 can abut against the end face of the assembled blank to bear the axial reaction force generated by the pressing, so as to achieve stable support; at the same time, the bearing seat 13 is equipped with axial adjustment pins and the bearing sections 14 are equipped with angle adjustment pins, which can respectively finely adjust the axial assembly position and the alignment angle of the bushing 15, further correct the assembly deviation, adapt to the working conditions of different blank end face dimensions and slight deviations in hole angles, further improve the assembly accuracy of the axial dimension of the bushing 15 and the oil hole angle, and broaden the application range of the device.

[0033] Specifically, the load-bearing seat 13 and the load-bearing section 14 are integrally formed, and the whole structure is fan-shaped.

[0034] The present invention also provides a bushing pressing method, which uses the above-mentioned bushing pressing device and includes the following steps: S0. Pre-adjustment and positioning: Use the first-installed end face bushing as a benchmark for axial and angular positioning of the pre-adjustment device; when pre-adjusting axial and angular positioning, adjust the bushing pressing device to the state after the bushing is assembled, place the bushing pressing device in the confined space adjacent to the end face, and then adjust the axial adjusting pin to contact and lock the blank surface at the end of the mounting hole, and adjust the angle adjusting pin to contact and lock the two sides corresponding to the position of the bearing seat 13; specifically, when pre-adjusting axial and angular positioning, first install the bushing in the non-confined space of the cylinder end face for benchmark adjustment, adjust the axial adjusting pin and the angle adjusting pin to contact and lock the blank surface at the end face of the mounting hole, and then take out the device to perform step S1 (the same cylinder is only pre-adjusted once). S1, Cooling bushing 15: Cooling bushing 15 with liquid nitrogen causes it to shrink and deform due to cold. S2. Pre-installation positioning: The bushing 15 is fitted onto the end of the spindle 1. The angular positioning is completed by the positioning part 2 cooperating with the oil hole of the bushing 15. Then the guide head 3 is tightened and fixed. S3. Alignment support: Insert the top rod sleeve 5 into the adjacent hole of the assembled body, adjust the axial adjustment pin to contact the blank surface at the end of the mounting hole, and adjust the angle adjustment pin to contact the two sides of the corresponding position of the bearing seat 13. S4. Pressing operation: The drive structure drives the transmission component 4 and the spindle 1 to move axially, pressing the bushing 15 into the assembly hole. S5. Reset and remove parts: After assembly, disassemble the guide head 3, and the drive structure reverses the drive transmission component 4 and the spindle 1 to reset.

[0035] This method first uses liquid nitrogen to cool and shrink the bushing 15, reducing the interference resistance between the bushing 15 and the assembly hole. This avoids the problem of the bushing 15 rapidly heating up and expanding after being removed from the low-temperature environment, causing the outer diameter to increase and making the pressing difficult. Then, the entire process of pre-installing and positioning the bushing 15, aligning and supporting the device, axial pressing, and resetting and removing the part is completed in sequence. The operation is completed in a limited space by relying on the aforementioned pressing device, eliminating the manual hammering method. The process is continuous and simple to operate, which reduces labor intensity and can stably ensure the alignment accuracy of the oil hole and the axial assembly dimensions of the bushing 15. The overall assembly efficiency is much higher than the traditional manual hammering process, which is suitable for batch bushing pressing operations such as cam holes in automobile and ship engine cylinder blocks.

[0036] It should be noted that the reduced diameter section 6 of the guide head 3 and the push rod sleeve 5 has a small clearance fit with the assembly hole and adjacent holes, which serves a centering function. The push rod sleeve 5 has a small clearance fit with the mandrel 1.

[0037] This invention effectively solves the assembly problem of bushing 15 in a confined space. During operation, the operator only needs to reciprocate the ratchet wrench 8 to complete the pressing. With the help of the device structure, the axial assembly depth of bushing 15 and the alignment accuracy of oil hole can be accurately guaranteed, thus improving the assembly quality. At the same time, the use of trapezoidal thread in conjunction with ratchet wrench 8 to transmit torque greatly reduces the operating load. Compared with the traditional manual hammering method, the overall assembly efficiency is also significantly improved.

[0038] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not 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 invention.

[0039] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bushing pressing device, characterized in that, include: The mandrel (1) is used to install the bushing (15) and is provided with a positioning element (2) for circumferential positioning of the bushing (15). The guide head (3) is detachably and fixedly installed at the end of the spindle (1) and is used to limit and press-fit the bushing (15); Transmission component (4) is coaxially fixed to the spindle (1); The push rod sleeve (5) is sleeved on the outside of the transmission component (4) and an anti-rotation structure is provided between it and the transmission component (4). The end of the push rod sleeve (5) facing away from the guide head (3) is provided with a reduced diameter section (6) that extends into the adjacent hole. A drive structure is used to drive the transmission component (4) and the spindle (1) to move axially.

2. The bushing pressing device according to claim 1, characterized in that, The positioning component (2) is a ball screw, which is fixed on the spindle (1) and engages with the oil hole of the bushing (15).

3. The bushing pressing device according to claim 1 or 2, characterized in that, The guide head (3) and the end of the spindle (1) are connected by a threaded detachable connection.

4. The bushing pressing device according to claim 1 or 2, characterized in that, The transmission component (4) is a screw, and the driving structure includes a nut (7) and a ratchet wrench (8); the nut (7) is threadedly engaged with the screw, and the ratchet wrench (8) is used to drive the nut (7) to rotate circumferentially.

5. The bushing pressing device according to claim 1 or 2, characterized in that, An interference fit is made on the top rod sleeve (5) with a limiting sleeve (9); the end of the limiting sleeve (9) facing the guide head (3) protrudes inward to form an inner edge (10), and the end of the nut (7) facing away from the guide head (3) protrudes outward to form an outer edge (11). The outer diameter of the outer edge (11) is smaller than the inner diameter of the inner edge (10).

6. The bushing pressing device according to claim 1 or 2, characterized in that, The anti-rotation structure includes an anti-rotation pin, which is fixedly installed on the top rod sleeve (5); the transmission component (4) has an anti-rotation groove (12) along the axial direction, and the end of the anti-rotation pin is slidably assembled in the anti-rotation groove (12).

7. The bushing pressing device according to claim 1 or 2, characterized in that, A bearing seat (13) is fixedly installed on the outside of the top rod sleeve (5); bearing sections (14) are provided at both ends of the bearing seat (13), axial adjustment pins are installed on the bearing seat (13), and angle adjustment pins are installed on the bearing sections (14).

8. A bushing press-fitting method, characterized in that, The bushing pressing device according to any one of claims 1 to 6 includes the following steps: S0, Pre-adjustment positioning: The axial and angular positioning of the pre-adjustment device is based on the first-installed end face bushing; S1, Cooling bushing (15): Use liquid nitrogen to cool the bushing (15) to cause it to shrink and deform. S2, Pre-installation positioning: Place the bushing (15) on the end of the spindle (1), and complete the angle positioning by cooperating with the oil hole of the bushing (15) through the positioning part (2), and then tighten and fix the guide head (3); S3, Alignment Support: Insert the top rod sleeve (5) into the adjacent hole of the assembled body; S4, Pressing operation: The drive structure drives the transmission component (4) and the spindle (1) to move axially and press the bushing (15) into the assembly hole; S5. Reset and remove parts: After assembly, disassemble the guide head (3), and reset the drive structure reverse drive transmission component (4) and spindle (1).

9. The bushing pressing method according to claim 8, characterized in that, In step S3, a bearing seat (13) is fixed on the outside of the top rod sleeve (5). Bearing sections (14) are provided at both ends of the bearing seat (13). An axial adjustment pin is installed on the bearing seat (13), and an angle adjustment pin is installed on the bearing section (14). The top rod sleeve (5) is inserted into the adjacent hole of the assembled body, and the axial adjustment pin is adjusted to contact the blank surface at the end of the mounting hole. The angle adjustment pin contacts the two sides of the bearing seat (13) at the corresponding position.

10. The bushing pressing method according to claim 9, characterized in that, In step S0, when pre-adjusting the axial and angular positioning, the bushing pressing device is adjusted to the state of the bushing being assembled, the bushing pressing device is placed in the adjacent limited space of the end face, and then the axial adjusting pin is adjusted to contact and lock the blank surface at the end of the mounting hole, and the angular adjusting pin is adjusted to contact and lock the two sides of the bearing seat (13) at the corresponding position.

Images