Open bush press fitting tool and press fitting method thereof

Abstract

This invention provides a pressing fixture and method for open bushings. The pressing fixture includes: a pressing upper block with a through hole extending vertically; a pressing device installed within the through hole; and a first elastic component fitted onto the pressing device, with its two ends contacting the upper part of the pressing device and the upper end face of the pressing upper block, respectively; a pressing lower block with a narrowed bushing having an inner hole, with the through hole aligned vertically with the inner hole; a pressing elastic component installed on the upper end of the pressing upper block and fitted onto the pressing device; the pressing upper block and the pressing lower block with a narrowed bushing engaging vertically, causing the pressing lower block to be subjected to lateral pressure to press the open bushing; and the pressing elastic component presses the pressing device into the inner hole, thus completing the pressing of the open bushing. This invention integrates the two processes of pressing open bushings into one process, completing both the bushing narrowing and pressing in a single pressing operation. This integrates the functions of narrowing and pressing, simplifies the process flow, and improves production efficiency and yield.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing technology, and in particular to an open bushing press-fitting fixture and its press-fitting method. Background Technology

[0002] In automotive chassis suspension and powertrain connection systems, bushings, as a key damping and connecting element, are widely used in components such as control arms and stabilizer bars. Among them, open bushings exhibit significant technical advantages due to their unique structural design: 1. The open design of the open bushing makes the installation process more convenient and can effectively accommodate minor deviations during assembly. Second, under stress conditions, the open structure allows the bushing to undergo adaptive elastic deformation, thereby better absorbing road impacts and vibrations; Third, compared to closed bushings, open bushings have a relatively lower manufacturing cost.

[0003] Based on the aforementioned advantages, open bushings have been widely used in modern automobile manufacturing. However, despite their performance and cost advantages, the press-fitting process of open bushings still faces significant technical bottlenecks in existing automobile manufacturing processes.

[0004] Currently, the industry generally adopts a step-by-step process for pressing open bushings. This process usually relies on two independent special tooling systems: one is a bushing necking tool, and the other is a bushing pressing tool.

[0005] Specifically, existing press-fitting processes typically include the following two independent press-fitting steps: The first step is the necking process: First, the operator or robot arm needs to place the open bushing on the necking fixture. Since the outer diameter of the open bushing is usually larger than the diameter of the mounting hole, the necking fixture must be used to close or reduce the opening of the bushing to a specific size so that its outer diameter meets the pressing requirements.

[0006] The second step is the pressing process: After the necking is completed, the pre-treated bushing needs to be transferred to the pressing station, where it is pressed into the mounting hole of the control arm or bracket using a pressing tool.

[0007] This two-step process of "first narrowing the opening, then pressing in" has revealed many defects in actual production: First, this two-step process is inefficient. Because it involves two separate pressing steps, the production line requires two sets of tooling equipment, and the bushing needs to be transferred or re-grabbed after the necking process. This not only increases the equipment footprint but also significantly extends the cycle time, making it difficult to meet the increasingly demanding cycle time requirements of modern automotive assembly lines and becoming a bottleneck restricting capacity increases.

[0008] Secondly, the yield rate of this two-step process is difficult to guarantee. During the transfer from the necking fixture to the pressing fixture, or while holding the bushing in the necking state awaiting pressing, the bushing is prone to springback or positional shift. Once the springback exceeds the tolerance range, or if the bushing deviates angularly during secondary positioning, it will directly lead to quality problems such as pressing failure, bushing flaking, rubber tearing, or pressing angle exceeding tolerance. In addition, multiple clamping and positioning also accumulate positioning errors, further reducing product consistency.

[0009] Finally, this two-step process is costly in terms of both labor and equipment. Two sets of tooling mean double the investment and maintenance costs for molds. At the same time, due to the complexity of the process, more manual intervention or more complex automated robotic arms are often required, which not only increases the labor costs of the production line but also increases the equipment failure rate and maintenance difficulty.

[0010] Therefore, existing open bushing press-fitting processes suffer from problems such as cumbersome procedures, low efficiency, poor quality stability, and high costs. In response, the inventors of this application have designed an open bushing press-fitting fixture and method to overcome these technical problems. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to overcome the defects of the existing open bushing press-fitting process, such as complicated procedures, low efficiency, poor quality stability and high cost, and to provide an open bushing press-fitting fixture and press-fitting method.

[0012] The present invention solves the above-mentioned technical problems through the following technical solution: A press-fitting fixture for an open bushing, characterized in that the open bushing press-fitting fixture is used for an open bushing of a rear overhang front lower control arm, comprising: The pressing block and the pressing device are provided. The pressing block is provided with a through hole that runs vertically through it. The pressing device is installed in the through hole and a first elastic member is sleeved on the pressing device. The two ends of the first elastic member are in contact with the upper part of the pressing device and the upper end face of the pressing block, respectively. A press-fitting shrink sleeve lower block is provided, wherein the press-fitting shrink sleeve lower block has an inner hole for accommodating the open bushing to be press-fitted, and the through hole is aligned vertically with the inner hole. A press-fit elastic component is installed on the upper end of the press-fit upper block and sleeved on the press-fit device for pressing the press-fit device. The upper pressing block and the lower pressing block of the constricted sleeve are wedge-shaped, so that the lower pressing block of the constricted sleeve is subjected to lateral pressure to press the open bushing, and the pressing elastic component presses the pressing device into the inner hole to complete the pressing of the open bushing.

[0013] According to one embodiment of the present invention, the press-fit elastic assembly includes a press-fit plate and a press-fit spring, one end of the press-fit spring being connected to the bottom end face of the press-fit plate, and the other end being connected to the upper end face of the press-fit upper block.

[0014] According to one embodiment of the present invention, the first elastic component is a lifting spring, and the two ends of the lifting spring respectively abut against the upper end of the pressing device and the upper end face of the pressing block.

[0015] According to one embodiment of the present invention, the compression spring is sleeved on the outside of the first elastic member.

[0016] According to one embodiment of the present invention, the lower end of the press-fit upper block is provided with a groove, the side wall of the groove is sloped, the outer wall of the press-fit shrink sleeve lower block is also sloped, and the press-fit shrink sleeve lower block is assembled into the groove and they match each other.

[0017] According to one embodiment of the present invention, the press-fitting shrink sleeve lower block is composed of multiple lower modules, which are assembled together to form the inner hole.

[0018] According to one embodiment of the present invention, the longitudinal cross-sectional shape of the press-fitted narrow sleeve lower block is an isosceles trapezoid.

[0019] According to one embodiment of the present invention, the pressing device is a cylindrical pressing rod.

[0020] This invention provides a method for pressing open bushings, characterized in that the method employs the opening bushing pressing fixture described above, and includes the following steps: S1. Place the open bushing in the inner hole of the lower block of the press-fitting narrow bushing, start the press and first contact the press-fitting elastic component, the press-fitting elastic component pushes the upper block of the press-fitting downward; S2. The upper pressing block moves to the upper end of the lower pressing block, and the lower pressing block contracts inward to press the opening bushing, so that the opening of the opening bushing is closed. S3. The upper pressing block and the lower pressing shrink sleeve block fit together, and the pressing equipment presses into the inner hole to press the open bushing.

[0021] According to an embodiment of the present invention, step S3 includes: S 31After the upper pressing block and the lower pressing sleeve block are fully engaged, the pressing elastic component contacts the pressing equipment. The press continues to apply pressure to push the first elastic component. The pressing equipment presses into the inner hole of the lower pressing sleeve block, presses the opening bushing out of the lower pressing sleeve block, and then presses into the mating part. S 32 The press continues to apply force to the press-fit elastic component and the press-fitting equipment until all displacements are completed, the open bushing press-fitting size is in place, and the open bushing press-fitting is completed.

[0022] The positive and progressive effects of this invention are as follows: This invention relates to an open bushing press-fit fixture and its press-fit method, which integrates the two processes of open bushing press-fitting into one process, completing both bushing necking and press-fitting in a single press. The open bushing press-fit fixture and its press-fitting method integrate necking and press-fitting functions, simplify the process flow, and improve production efficiency and yield. Attached Figure Description

[0023] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein: Figure 1 This is an exploded view of the open bushing press-fit tooling of the present invention.

[0024] Figure 2 This is a schematic diagram of the installation structure of the press-fit elastic component and the press-fit upper block in the open bushing press-fit tooling of the present invention.

[0025] Figure 3 This is a schematic diagram of the installation structure of the pressing equipment and the first elastic component in the open bushing pressing tooling of the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the press-fitting lower block of the narrowed bushing in the press-fitting tooling of the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of the open bushing in the press-fitting fixture of the present invention.

[0028] Figure 6 This is a perspective view of the open bushing press-fit fixture of the present invention.

[0029] [Attached image labels]

[0030] Press-fit block 10

[0031] Press fitting equipment 20

[0032] Press-fitting shrink sleeve lower block 30

[0033] Press-fit elastic component 40

[0034] Through hole 11

[0035] First elastic component 21

[0036] Inner hole 31

[0037] Open bushing 50

[0038] Press plate 41

[0039] Press-fit spring 42

[0040] Groove 12

[0041] Module 32 Detailed Implementation

[0042] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0043] Embodiments of the invention will now be described in detail with reference to the accompanying drawings. It should be noted that these and subsequent drawings are merely illustrative and are not drawn to scale, and should not be construed as limiting the scope of the invention. Wherever possible, the same reference numerals will be used in all drawings to denote the same or similar parts.

[0044] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the applicant in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0045] Furthermore, the invention should be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0046] like Figures 1 to 6As shown, this invention discloses an open bushing press-fitting fixture, comprising: an upper press-fitting block 10, a press-fitting device 20, a lower press-fitting constricted bushing block 30, and a press-fitting elastic component 40. The upper press-fitting block 10 serves as the upper main support component, and its interior has a through hole 11 that extends vertically along the longitudinal axis, providing axial guidance for the press-fitting action. The press-fitting device 20, as the movable component performing the press-fitting operation, is mounted within the through hole in a manner that allows it to slide vertically. A first elastic component 21, which serves as a buffer and reset element, is fitted around the outer periphery of the press-fitting device 20. The two ends of the first elastic component 21 are in close contact with the upper limiting surface of the press-fitting device 20 and the top surface of the upper press-fitting block 10, respectively, thereby forming an elastic support between them.

[0047] The lower part of the press-fitting shrink sleeve 30 serves as the positioning and closing component at the bottom. It has a specific inner hole 31 in the center. The inner hole 31 is used to accommodate, fix and constrain the open bushing 50 to be press-fitted. The through hole 11 of the upper press-fitting block 10 and the inner hole 31 of the lower press-fitting shrink sleeve 30 are precisely aligned vertically to form a continuous press-fitting channel.

[0048] The press-fit elastic component 40 serves as a power transmission and secondary buffer mechanism. It is installed at the upper end of the press-fit upper block 10 and is also sleeved around the press-fit device 20. It is used to press the press-fit device 20 downward when receiving external driving force, thereby driving the press-fit device 20 to move down along the through hole 11 to complete the press-fit operation of the open bushing 50.

[0049] In this embodiment, the pressing device 20, in actual manufacturing and application, can preferably be embodied as a columnar pressing rod, with the axial extension of the pressing rod ensuring the linear transmission of the pressing force. Of course, the columnar pressing rod mentioned here is merely an example of one preferred embodiment, and its specific structural form and appearance are not limited thereto. Under actual operation and different working conditions, the pressing device 20 can also be flexibly replaced or adopted with any other mechanical structure or component that can achieve the same pressing function, and these variations derived from equivalent structural replacements should undoubtedly be included within the scope of protection of this application.

[0050] During the press-fitting process, the upper press-fitting block 10, through its precise inclined surface design, forms an upper and lower wedge-shaped pair (inclined surface) with the lower press-fitting sleeve block 30. When the press-fitting spindle descends, this inclined surface contact efficiently converts the vertical driving force into a lateral component force, causing the lower press-fitting sleeve block 30 to be subjected to uniform lateral extrusion force, thereby precisely pressing the open bushing inward. Based on this, the system uses the integrated press-fitting elastic component 40 for flexible buffering and load transfer, smoothly pressing the actuator of the press-fitting equipment 20 to steadily press the open bushing 50 into the inner hole 31 of the workpiece, ultimately completing the overall press-fitting of the open bushing 50 safely and efficiently.

[0051] Preferably, such as Figure 2 As shown, the press-fit elastic component 40 is mainly composed of a press-fit plate 41 and a key press-fit spring 42. During assembly, a longitudinally aligned connection is adopted, firmly connecting the top end of the press-fit spring 42 to the bottom surface of the press-fit plate 41, while its opposite bottom end extends downwards and reliably connects to the upper surface of the press-fit upper block 10, thus creating an elastic buffer channel between the two. Furthermore, to optimize the spatial structure and avoid motion interference, the entire press-fit spring 42 is scientifically fitted onto the outside of the first elastic component 21 in a coaxial or enclosing form, achieving a compact nested layout.

[0052] like Figure 3 As shown, in the specific structural selection, the first elastic component 21 is preferably configured as a lifting spring. The two ends of the lifting spring are arranged symmetrically and are firmly pressed between the upper end of the pressing device 20 and the upper end face of the pressing block 10, thereby establishing reliable axial elastic support between the two. In the field of dedicated pressing tooling design for open bushing 50, the lifting spring defined here essentially refers to an elastic core component used to realize mechanism reset, provide flexible dynamic support, or meet the requirements of automatic ejection of workpiece. Depending on different design contexts and conventions, it can also be called "reset spring", "guide spring", "vertical spring" or "joint elbow spring", etc. When the entire pressing process is completed and the pressing force is released, the strong elastic force accumulated by the first elastic component 21 (i.e., the lifting spring) will be released instantly, automatically and smoothly pushing the processed workpiece back to the initial waiting position, thereby significantly improving the cyclic automation efficiency of the entire process.

[0053] like Figure 2 As shown, preferably, in terms of structural details, the bottom end of the press-fit upper block 10 is specially provided with a groove 12 of a specific geometric shape. The inner wall of the groove 12 is not vertical, but presents a precise slope (or guide slope) design. Corresponding to and highly coordinated with this structure, the outer contour wall of the press-fit narrowing sleeve lower block 30 is also machined into a matching slope shape.

[0054] During actual assembly, the press-fitted shrink sleeve lower block 20 is precisely assembled and embedded into the groove 12 from bottom to top. The slope surfaces of the two fit perfectly and match each other in space, thus providing a solid mechanical contact reference for subsequent wedge force transmission.

[0055] like Figure 4 As shown, in the specific structural optimization design, the press-fitted narrow sleeve lower block 30 can preferably adopt a split structure, that is, it is composed of multiple independently processed lower modules 32. In the assembly and operation state, these lower modules 33 are precisely spliced ​​together by circumferential or butt joint methods, thereby jointly forming a process inner hole in the central area to accommodate and constrain the open bushing 50.

[0056] Meanwhile, in order to meet the dual requirements of force transmission and structural strength on the inclined plane, the cross-sectional geometry of the press-fitted narrow sleeve lower block 30 cut along its longitudinal direction can be preferably configured as a standard isosceles trapezoid in the design to ensure the consistency of the slope on both sides and the balance of force.

[0057] The present invention also provides a method for pressing open bushings, which uses the opening bushing pressing fixture described above, and the method includes the following steps: Step S1: Place the open bushing 50 into the inner hole 31 of the lower block 30 of the press fitting sleeve, start the press and first contact the press fitting elastic component 40, and the press fitting elastic component 40 pushes the upper block 10 of the press fitting downward.

[0058] More specifically, in the preparation stage of the pressing operation, the open bushing 50 to be processed is first accurately and stably placed and locked inside the inner hole 31 formed by the assembly of the lower block 30 of the pressing and shrinking bushing, so that it obtains preliminary radial positioning. Subsequently, the press of the pressing equipment 20 is officially started, and its main shaft or press head descends smoothly under the drive of the control system, and immediately contacts and forces the upper pressing elastic component 40. As the press continues to apply initial pressure downward, this power is pre-pressed and smoothly transitioned through the pressing elastic component 40 (such as the pressing plate 41 and the pressing spring 42), thereby smoothly pushing the lower pressing block to overcome resistance and begin to move downward axially in a regular manner along the vertical guide rail, which provides sufficient power for the subsequent inclined extrusion and shrinking action.

[0059] Step S2: The upper pressing block 10 moves to the upper end of the lower pressing block 30, and the lower pressing block 30 contracts inward to press the opening bushing 50, so that the opening of the opening bushing 50 is closed.

[0060] The upper press-fit block 10 forms a wedge-shaped device and first contacts the lower press-fit shrink sleeve block 30, and provides lateral pressure to the lower press-fit shrink sleeve block 30, pressing the lower press-fit shrink sleeve block 30 tightly, so that the open bushing 50 closes accordingly.

[0061] More specifically, as the pressing spindle continues to descend, the upper pressing block 10 steadily moves to the upper position of the lower pressing sleeve 30. Since the upper pressing block 10 and the lower pressing sleeve 30 form a precise wedge-shaped mechanism system, during the descent, the sloping groove surface of the upper pressing block 10 first contacts and engages with the outer inclined surface of the lower pressing sleeve 30. With the continuous loading of axial driving force, this wedge-shaped device begins to perform efficient mechanical torque conversion and force transmission, successfully converting the vertically downward mechanical driving force into a powerful lateral centripetal load, and continuously providing uniform lateral extrusion force to the lower pressing sleeve 30.

[0062] Under the rigid drive of this lateral pressure, the originally separate press-fitted and contracted sleeve modules 30 begin to synchronously and regularly contract towards the central axis, thereby firmly pressing the open bushing located in its inner hole 31. Under the continuous pressure of this radial centripetal force, the open bushing 50 produces a small amount of elastic or plastic deformation, forcing its originally open opening gap to gradually move inward, eventually achieving perfect closure and reaching the expected locking and shaping state.

[0063] Step S3: Press-fit upper block 10 and press-fit lower block 30 fit together, and press-fit device 20 presses into inner hole 31 to press-fit open bushing 50.

[0064] Preferably, step S3 includes: Step S 31 After the upper pressing block 10 and the lower pressing block 30 are fully engaged, the elastic pressing component 40 contacts the pressing equipment 20. The press continues to apply pressure to push the first elastic component 21. The pressing equipment 21 presses into the inner hole 31 of the lower pressing block 30, presses out the open bushing 50 from the lower pressing block 30, and then presses in the mating parts.

[0065] More specifically, when the inclined surfaces of the upper pressing block 10 and the lower pressing sleeve 30 are fully engaged and the radial narrowing stroke reaches its limit displacement, the entire peripheral tightening mechanism locks. At this point, the pressing elastic component 40 begins to undergo substantial deformation under continuous downward pressure, causing the press head or upper power source to rigidly contact the internal pressing device 20. As the press continues to apply downward axial force on this reference, this pressure begins to forcefully push and compress the first elastic component 21 (i.e., the lifting spring), thereby activating the axial pressing stroke of the pressing device 20. Driven by this continuous propulsive force, the pressing device accurately and smoothly presses into the inner hole 31 of the lower pressing sleeve 30 along the axis. Through precise rigid alignment, the press-fitting equipment 20 pushes the fully closed and shaped open bushing 50 out along the axial direction from the restraint of the press-fitting shrink sleeve lower block 30, and then presses it precisely and firmly into the preset inner hole 31 of the part to be mated below without any resistance, thus perfectly achieving the high-precision final assembly of the open bushing 50.

[0066] Step S 32 The press continues to apply force to the press-fitting elastic component 40 and the press-fitting equipment 20 until all displacements are completed, the open bushing 50 is pressed into place, and the press-fitting of the open bushing 50 is completed.

[0067] More specifically, in this final stage, the press system maintains its rated output and continues to steadily apply axial thrust to the press-fitting elastic component 40 and the press-fitting device 20, ensuring that the drive load is efficiently transmitted downwards. This propulsion process continues until the entire tooling mechanism has completed all preset mechanical strokes and displacements.

[0068] At this point, the downward termination line of the pressing equipment 20 perfectly coincides with the reference plane, thus ensuring that the pressing depth and geometric dimensions of the open bushing accurately meet the design tolerance requirements and achieve dimensional accuracy. Once the detection system confirms that all displacement and pressure parameters have reached the standard set values, the power source stops outputting, and the entire pressing operation of the open bushing 50 is successfully completed.

[0069] In summary, the open bushing press-fitting fixture and its press-fitting method of the present invention have the following advantages: First, the ingenious rigid-flexible stepped mechanical transmission achieves a seamless connection between the two processes of "narrowing" and "pressing," allowing both steps to be completed in a single process.

[0070] By leveraging the stiffness difference and coordinated action between the press-fit elastic component (e.g., press-fit spring) and the first elastic component (e.g., support spring), the complex assembly process is scientifically divided into two orderly stages: Stage 1 (flexible necking): The press first compresses the elastic component, pushing the upper press-fit block downwards to complete the closure of the inclined necking; Stage 2 (rigid pressing): After the upper press-fit block and the lower press-fit necking sleeve are fully engaged and locked, the power is rigidly transferred, breaking through the resistance of the support spring to activate the press-fitting equipment, and smoothly pressing out and pressing in the mating parts.

[0071] 2. Absorbing rigid impacts and extending tooling life: This force transmission mechanism, which combines rigidity and flexibility, plays an excellent mechanical buffering role at the critical point of perfect fit, effectively avoiding hard collisions between mechanical components and reducing mold wear.

[0072] 3. A wedge-shaped centripetal clamping structure formed by the upper press-fitting block and the lower press-fitting reducing sleeve block eliminates the opening rebound of the open bushing, ensuring non-destructive press-fitting: By utilizing the upper and lower wedge-shaped fit of the upper press-fitting block and the lower press-fitting reducing sleeve block, the vertical pressure of the press is cleverly converted into a lateral centripetal force. Before the bushing enters the target hole, its opening is pre-closed tightly, ensuring the roundness and consistency of the outer diameter of the open bushing before pressing, and preventing the open bushing from scratching the workpiece or tilting during press-fitting due to its own elastic opening.

[0073] IV. Multi-part linkage for uniform stress distribution: The press-fitted shrink sleeve lower block adopts a symmetrical design with multiple lower modules assembled and a longitudinal cross section of isosceles trapezoid, which enables lateral pressure to act on the outer periphery of the bushing in an all-round and centripetal manner, effectively preventing surface scratches or material crushing caused by local stress concentration.

[0074] 5. Once the upper press-fit block and the lower press-fit sleeve block are fully engaged on their inclined surfaces, the tooling seamlessly transitions to axial pressing mode. The press-fitting equipment strictly aligns and pushes along the closed inner cavity, ensuring that the open bushing does not experience any shape rebound during the transition from the lower press-fit sleeve block to the mating part.

[0075] VI. The press continues to apply force until all process displacement limits are reached. Through precise stroke control, it ensures that the final pressing depth, interference fit, and relative position dimensions of the open bushing accurately meet the design tolerance requirements, perfectly avoiding quality risks such as leakage, overpressure, or improper assembly.

[0076] VII. Achieving efficient automatic demolding and return: Utilizing a primary elastic component (such as a lifting spring) as a multi-functional elastic element. At the moment the pressing process is successfully completed and the press returns and releases pressure, the elastic restoring force accumulated by the lifting spring instantly and smoothly pushes the workpiece back to its initial waiting reference position.

[0077] 8. Reduced labor costs and shorter production cycle: This automatic ejection and resetting design completely eliminates the cumbersome steps of traditional tooling that require manual prying or additional cylinder assistance for demolding. It not only achieves a closed-loop process without human intervention, but also significantly shortens the operation cycle and greatly improves the automation level and mass production efficiency of the entire assembly line.

[0078] For those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0079] It should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0080] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0081] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0082] Similarly, it should be noted that, in order to simplify the description of the embodiments disclosed in this application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of this application requires more features than those mentioned in the claims. In fact, the embodiments have fewer features than all the features of the single embodiments disclosed above.

[0083] Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, the numerical parameters should take into account specified significant digits and employ a general method of digit preservation. Although the numerical ranges and parameters used to confirm their breadth of application in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0084] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An open bush press tool characterized by, The open bushing press-fitting fixture is used for the open bushing of the rear overhang front lower control arm, including: The pressing block and the pressing device are provided. The pressing block is provided with a through hole that runs vertically through it. The pressing device is installed in the through hole and a first elastic member is sleeved on the pressing device. The two ends of the first elastic member are in contact with the upper part of the pressing device and the upper end face of the pressing block, respectively. A press-fitting shrink sleeve lower block is provided, wherein the press-fitting shrink sleeve lower block has an inner hole for accommodating the open bushing to be press-fitted, and the through hole is aligned vertically with the inner hole. A press-fit elastic component is installed on the upper end of the press-fit upper block and sleeved on the press-fit device for pressing the press-fit device. The upper pressing block and the lower pressing block of the constricted sleeve are wedge-shaped, so that the lower pressing block of the constricted sleeve is subjected to lateral pressure to press the open bushing, and the pressing elastic component presses the pressing device into the inner hole to complete the pressing of the open bushing.

2. The open bush press fitting tool according to claim 1, wherein The press-fit elastic component includes a press-fit plate and a press-fit spring. One end of the press-fit spring is connected to the bottom end face of the press-fit plate, and the other end is connected to the top end face of the press-fit upper block.

3. The open bush press fitting tool according to claim 1, wherein The first elastic component is a lifting spring, and the two ends of the lifting spring abut against the upper end of the pressing equipment and the upper end face of the pressing block, respectively.

4. The open bushing press-fitting fixture as described in claim 2, characterized in that, The compression spring is sleeved on the outside of the first elastic component.

5. The open bushing press-fitting fixture as described in claim 1, characterized in that, The lower end of the press-fit upper block has a groove, the side wall of the groove is sloping, the outer wall of the press-fit shrink sleeve lower block is also sloping, and the press-fit shrink sleeve lower block is assembled into the groove and they match each other.

6. The open bushing press-fitting fixture as described in claim 1, characterized in that, The press-fitted shrink sleeve lower block is composed of multiple lower modules, which are assembled together to form the inner hole.

7. The open bushing press-fitting fixture as described in claim 1, characterized in that, The longitudinal cross-sectional shape of the press-fitted shrink sleeve lower block is an isosceles trapezoid.

8. The open bush press fit tool of claim 1, wherein, The pressing equipment is a cylindrical pressing rod.

9. A method of press-fitting an open bushing, characterized by, The open bushing press-fitting method employs the open bushing press-fitting fixture as described in any one of claims 1-8, and the open bushing press-fitting method includes the following steps: S1. Place the open bushing in the inner hole of the lower block of the press-fitting narrow bushing, start the press and first contact the press-fitting elastic component, the press-fitting elastic component pushes the upper block of the press-fitting downward; S2. The upper pressing block moves to the upper end of the lower pressing block, and the lower pressing block contracts inward to press the opening bushing, so that the opening of the opening bushing is closed. S3. The upper pressing block and the lower pressing shrink sleeve block fit together, and the pressing equipment presses into the inner hole to press the open bushing.

10. The method for pressing open bushings as described in claim 9, characterized in that, Step S3 includes: S 31 After the upper pressing block and the lower pressing sleeve block are fully engaged, the pressing elastic component contacts the pressing equipment. The press continues to apply pressure to push the first elastic component. The pressing equipment presses into the inner hole of the lower pressing sleeve block, presses the opening bushing out of the lower pressing sleeve block, and then presses into the mating part. S 32 The press continues to apply force to the press-fit elastic component and the press-fitting equipment until all displacements are completed, the open bushing press-fitting size is in place, and the open bushing press-fitting is completed.

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