Internal combustion engine connecting rod bushing press-fitting positioning device

Abstract

The invention relates to the technical field of bushing press-fitting devices, in particular to an internal combustion engine connecting rod bushing press-fitting positioning device which comprises a vertical frame, a positioning tray, a press-fitting driving box and a vibration hammer assembly. A three-jaw chuck is arranged on the positioning tray and is matched with a replaceable mold block to clamp and position the internal combustion engine connecting rod; the press-fitting driving box is used for driving the vibration hammer assembly to integrally press downwards and exerting axial press-fitting force on the lining. A rotating wheel set driven by a motor and a plurality of punching blocks are arranged in the vibration hammer assembly, high-frequency impact is formed on a hammer sleeve in the press-fitting process, the impact is transmitted to a lining through a press column head, and vibration auxiliary press-fitting is achieved. According to the device, the assembly resistance is effectively reduced while the press-fitting stability is guaranteed, the damage to the bushing and the connecting rod is reduced, and the press-fitting precision and the adaptive capacity to internal combustion engine connecting rods of different specifications are improved.

Description

Technical Field

[0001] This invention relates to the field of bushing pressing device technology, specifically to a connecting rod bushing pressing and positioning device for internal combustion engines. Background Technology

[0002] As a crucial transition component between the connecting rod and the crankshaft or piston pin, the assembly accuracy of the connecting rod bushing directly affects the stability and service life of the engine. In existing manufacturing processes, connecting rod bushings are typically installed in the inner bore of the connecting rod body using an axial press-fit method. This press-fitting process places high demands on positioning accuracy, uniform force distribution, and the stability of the assembly process.

[0003] In existing technologies, the assembly of connecting rod bushings for internal combustion engines generally employs hydraulic presses, mechanical presses, or screw pressing mechanisms to apply continuous axial static pressure to the bushing to overcome the interference fit resistance between the bushing and the connecting rod bore, thus completing the press-fit. This type of structure typically relies on a strong, unidirectional pressing method, resulting in concentrated force during the press-fit process and significant instantaneous pressing resistance. This can easily lead to jamming before the bushing is fully in its installation position, resulting in localized bushing deformation, out-of-roundness of the inner bore, or damage to the connecting rod bore wall, affecting assembly quality and subsequent performance.

[0004] Furthermore, existing bushing press-fitting devices are mostly based on simple linear pressing mechanisms in their structural design, lacking means to adjust the dynamic assembly state during the press-fitting process. They cannot introduce auxiliary vibration or impact effects during the press-fitting process to reduce assembly resistance. When the friction between the bushing and the connecting rod hole is large or the assembly tolerance fluctuates, it is often necessary to further increase the pressing force to complete the assembly, which not only increases the risk of damage to the workpiece but also places higher demands on the rigidity and energy consumption of the equipment.

[0005] In terms of tooling positioning, existing technologies often use fixed fixtures or universal clamping mechanisms to position the connecting rods of internal combustion engines. Such positioning structures have limited adaptability, and structural differences between different models of connecting rods often require frequent replacement of the entire set of tooling or adaptation through manual adjustment. This can easily introduce positioning deviations, affecting the coaxiality and assembly consistency between the bushing and the connecting rod hole, thereby reducing the overall pressing accuracy and production efficiency.

[0006] Therefore, how to reduce the assembly resistance during the press-fitting process, reduce the risk of workpiece damage caused by strong static pressure, and improve the adaptability and positioning accuracy of the tooling for connecting rods of different specifications of internal combustion engines while ensuring stable press-fitting of connecting rod bushings of internal combustion engines has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] This invention aims to solve the problems of the commonly used strong static pressure method in the press-fitting process of connecting rod bushings in existing internal combustion engines, which easily leads to bushing deformation, connecting rod hole wall damage, assembly jamming, and insufficient positioning accuracy. This invention provides a connecting rod bushing press-fitting positioning device for internal combustion engines. By introducing a vibration and impact mechanism during the press-fitting process and combining it with an adjustable and highly adaptable tooling positioning structure, it effectively reduces assembly resistance while ensuring press-fitting stability, and improves bushing press-fitting quality and tooling adaptability accuracy.

[0008] To achieve the above objectives, the present invention adopts the following technical solution.

[0009] The present invention provides a connecting rod bushing press-fitting and positioning device for an internal combustion engine, comprising a stand, a press-fitting drive box, a vibratory hammer assembly, and a positioning tray fixed to the surface of the stand. The positioning tray is provided with a three-jaw chuck for tooling the connecting rod of the internal combustion engine. The press-fitting drive box is arranged relative to the three-jaw chuck, and the vibratory hammer assembly is slidably sleeved inside the press-fitting drive box. The vibratory hammer assembly is driven downward by the press-fitting drive box, which applies axial press-fitting force to the bushing. At the same time, the vibration and impact generated by the internal structure of the vibratory hammer assembly enables the bushing to overcome assembly resistance and stably enter the installation position during the press-fitting process.

[0010] In a preferred embodiment, the vibratory hammer assembly is further configured as follows: the vibratory hammer assembly includes a slide box, a motor, a set of rotating wheels, a plurality of punches, and a hammer sleeve slidably mounted inside the slide box; the motor is used to drive the set of rotating wheels to rotate; and the punches, under the action of the set of rotating wheels, form periodic impacts on the hammer sleeve.

[0011] This structure allows the vibratory hammer assembly to be subjected to high-frequency impact during axial pressing, effectively reducing the instantaneous assembly resistance during bushing pressing and reducing the risk of structural damage caused by static pressure pressing.

[0012] In a preferred embodiment, the three-jaw chuck is further configured such that each jaw of the chuck is movably mounted with a replaceable molded module, the surface of which is provided with a groove adapted to the connecting rod structure of an internal combustion engine.

[0013] By replacing different specifications of the module, stable clamping of connecting rods for different models of internal combustion engines can be achieved, improving the versatility and positioning accuracy of the tooling and avoiding pressing deviations caused by unstable clamping.

[0014] In a preferred embodiment, the configuration is further as follows: an adjusting gear is movably mounted on the top of the support frame, and the pressing drive box is fixed to one end of the adjusting gear, so that the position of the pressing drive box can be adjusted by the lateral sliding of the adjusting gear.

[0015] This structure allows the press-fit drive position to be flexibly adjusted according to the specifications of the internal combustion engine connecting rod, improving the device's adaptability to workpieces of different sizes.

[0016] In a preferred embodiment, the following configuration is further provided: a driving component is fixedly installed inside the press-fit drive box, and a toothed rod that meshes with the output end of the driving component is fixedly installed on the surface of the press-fit drive box. The driving component drives the vibratory hammer assembly to press down as a whole, and a pressure column head is detachably connected to the bottom end of the vibratory hammer assembly.

[0017] This structure enables stable and controllable axial downward pressing motion of the vibratory hammer assembly, and effectively transmits the pressing force and impact force to the bushing position through the pressure column head, facilitating maintenance and replacement.

[0018] In a preferred embodiment, the wheel assembly is further configured such that: the wheel assembly includes a plurality of discs arranged along an axis, each disc surface is provided with spiral protrusions symmetrically distributed about the center of the wheel assembly, and the spiral protrusions of adjacent discs are arranged alternately.

[0019] This structure allows multiple punches to be driven sequentially during the rotation of the wheel assembly, thereby generating a higher frequency and more continuous impact output per unit time, improving the vibration pressing effect.

[0020] In a preferred embodiment, the outer periphery of the wheel and the spiral teeth is provided with a sliding groove for sliding contact with the punching block abutment, and the wheel and the punch are arranged in a one-to-one correspondence.

[0021] This structure ensures the stability and consistency of force transmission to the impact block, making the impact process continuous and reliable.

[0022] In a preferred embodiment, the hammer sleeve is further configured such that: the hammer sleeve is fitted onto the outer periphery of the rotating wheel assembly, a gap is provided between its inner side and the outer periphery of the rotating wheel assembly, and sliding guides fixed to the inner side of the sliding box are provided on both sides of the hammer sleeve.

[0023] The guide component guides the hammer sleeve, ensuring that it moves stably only along the axial direction during impact, thus avoiding swaying or interference.

[0024] In a preferred embodiment, the punch is further configured as follows: the punch is a metal counterweight structure that provides a vibrational impact effect to the hammer sleeve and the pressure column head by periodically striking the top surface of the hammer sleeve. Utilizing the punch's own mass and elastic structure, efficient vibration pressing is achieved without significantly increasing the driving power.

[0025] The beneficial effects achieved by this invention are as follows: 1. In this invention, by introducing high-frequency reciprocating impact of the vibratory hammer assembly during the bushing pressing process, the pressure pin head applies axial pressing force to the bushing while superimposing periodic impact, effectively reducing the instantaneous assembly resistance during the bushing pressing process, avoiding assembly jamming, skewing or local stress concentration problems caused by a single static pressure method, thereby improving the stability and reliability of the bushing pressing process.

[0026] 2. In this invention, the wheel assembly is composed of multiple wheel disks, and a spiral tooth structure is set on its surface in an alternating manner. It works in conjunction with multiple punch blocks to enable the vibratory hammer assembly to generate a higher frequency and more continuous impact output per unit time. This structure achieves an increase in the number of impacts and impact efficiency without significantly increasing the overall driving power, which is beneficial for the bushing to enter the target installation position quickly and evenly during the pressing process.

[0027] 3. The present invention uses a replaceable mold module in conjunction with a three-jaw chuck in the tooling positioning structure. Different specifications of mold modules can be quickly replaced according to the internal combustion engine connecting rod structure, so that the same device can be adapted to the tooling requirements of various models of internal combustion engine connecting rods, effectively improving positioning accuracy and clamping consistency, reducing human adjustment errors, and improving the versatility and precision of the overall pressing operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the surface structure of the positioning tray according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the sliding box and its surface driving component and cylindrical toothed rod structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the sliding box according to an embodiment of the present invention; Figure 5 This is an exploded view of the vibratory hammer assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the wheel assembly and punch block structure according to an embodiment of the present invention; Figure 7 This is a front view schematic diagram of the wheel assembly and punch block according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the disk surface structure according to an embodiment of the present invention.

[0029] Figure label: 100. Stand; 110. Positioning tray; 120. Three-jaw chuck; 121. Type module; 130. Adjusting gear; 200. Press-fit drive box; 210. Drive component; 220. Gear rod; 300. Vibratory hammer assembly; 310. Sliding box; 320. Motor; 330. Rotary wheel assembly; 340. Hammer sleeve; 350. Punch block; 331. Wheel disc; 332. Rotary tooth; 333. Slide groove; 341. Hammer head; 342. Sliding guide; 351. Push rod; 352. Spring; 400. Pressing column head. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0031] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0032] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, a connecting rod bushing press-fitting and positioning device for an internal combustion engine.

[0033] Combination Figures 1-8 As shown, the present invention provides a connecting rod bushing press-fitting and positioning device for an internal combustion engine, comprising a frame 100, a positioning tray 110, a press-fitting drive box 200, and a vibratory hammer assembly 300. The positioning tray 110 is fixedly installed on the upper end of the frame 100 for positioning and clamping the connecting rod of the internal combustion engine; the press-fitting drive box 200 is arranged relative to the positioning tray 110 for providing axial downward pressing driving force to the vibratory hammer assembly 300; the vibratory hammer assembly 300 is slidably sleeved inside the press-fitting drive box 200 and moves axially up and down under the drive of the press-fitting drive box 200 to complete the bushing press-fitting operation.

[0034] In this embodiment, the surface of the positioning tray 110 is provided with a three-jaw chuck 120 for positioning the internal combustion engine connecting rod. The three-jaw chuck 120 is used to clamp and position the internal combustion engine connecting rod so that it maintains a stable posture during the pressing process.

[0035] The press-fit drive box 200 is arranged relative to the three-jaw chuck 120. The vibratory hammer assembly 300 is slidably installed inside the press-fit drive box 200 and can move downwards in the vertical direction under the driving action of the press-fit drive box 200.

[0036] Combination Figures 3-4 As shown, the vibratory hammer assembly 300 includes a sliding box 310, a motor 320, a rotating wheel assembly 330, several punches 350, and a hammer sleeve 340 slidably mounted inside the sliding box 310. The motor 320 is fixedly mounted on one side of the sliding box 310 and drives the rotating wheel assembly 330 to rotate. The hammer sleeve 340 is located on the outer periphery of the rotating wheel assembly 330 and can slide axially within the sliding box 310. A hammer head 341 is integrally or fixedly provided at the bottom end of the hammer sleeve 340 for transmitting the impact force downwards.

[0037] Each punch 350 is arranged above the rotating wheel assembly 330. The bottom end of each punch 350 is provided with a stop rod 351 that penetrates the top surface of the hammer sleeve 340 and slides against the surface of the rotating wheel assembly 330. The top end of each punch 350 is provided with a spring 352 that abuts against the top surface of the inner cavity of the hammer sleeve 340. During the rotation of the rotating wheel assembly 330, the periodic pushing and releasing of the punches 350 causes them to reciprocate against the top surface of the hammer sleeve 340 under the action of the spring 352 and their own gravity, thereby achieving vibration impact pressing. The hammer sleeve 340 can slide axially relative to the slide box 310 to a limited extent. When a punch 350 is lifted and released by the rotating wheel assembly, its downward impact force acts on the top surface of the hammer sleeve 340, pushing the hammer sleeve 340 and its lower hammer head 341 and pressure column head 400 downwards to generate an instantaneous impact displacement. After the impact, under the continuous axial pressure provided by the press-fit drive box 200, the hammer sleeve 340 can be reset, waiting for the next impact.

[0038] Combination Figure 2 As shown, in this embodiment, each jaw of the three-jaw chuck 120 is movably mounted with a molding module 121. The molding module 121 can be snapped or rotated onto the jaw surface, and each molding module 121 can be replaced according to different specifications of internal combustion engine connecting rods. Its surface is provided with a groove adapted to the shape and structure of the internal combustion engine connecting rod. Through the cooperation of the molding module 121 and the three-jaw chuck 120, stable clamping and precise positioning of the internal combustion engine connecting rod are achieved.

[0039] In this embodiment, an adjusting rack 130 is movably mounted on the top of the support frame 100. The adjusting rack 130 is arranged horizontally, and the press-fit drive box 200 is fixedly mounted on one end of the adjusting rack 130. By adjusting the lateral sliding of the adjusting rack 130, the position of the press-fit drive box 200 relative to the three-jaw chuck 120 can be adjusted to adapt to the press-fit requirements of internal combustion engine connecting rods of different specifications and structural dimensions. The adjusting rack 130 can be driven to slide horizontally by a manual crank, servo motor, etc., and its position is fixed after adjustment by locking screws or an automatic locking mechanism.

[0040] In this embodiment, a driving component 210 is fixedly installed on the inner side of the press-fit driving box 200, and a toothed rod 220 is fixedly installed on the outer surface of the press-fit driving box 200. The toothed rod 220 meshes with the output end of the driving component 210, and the vibratory hammer assembly 300 moves axially downward along the inner side of the press-fit driving box 200 by the driving component 210.

[0041] The bottom end of the vibratory hammer assembly 300 is detachably connected to a pressure head 400 via a hammer head 341. The pressure head 400 is used to directly contact the bushing, applying the axial pressure and vibration impact force generated by the vibratory hammer assembly 300 to the bushing to achieve bushing press-fitting. The pressure head 400 is detachably connected to the hammer head 341 via a threaded connection, snap-fit, or standard quick-change interface to facilitate replacement according to the bushing size and shape.

[0042] In this embodiment, the wheel assembly 330 includes a plurality of wheel disks 331, which are arranged sequentially along the axial direction of the wheel assembly 330. The surface of each wheel disk 331 is provided with spiral protrusions 332 symmetrically arranged about the origin of the center of the wheel assembly 330, and the spiral protrusions 332 on each wheel disk 331 are staggered in the axial direction.

[0043] Through this structural design, when the wheel assembly 330 rotates at high speed, the spiral teeth 332 on different wheel discs 331 can act on different punches 350 in sequence, thereby forming a continuous, high-frequency impact output.

[0044] Combination Figures 6-8 As shown in this embodiment, both the wheel 331 and the spiral tooth 332 have a sliding groove 333 on their outer periphery. The sliding groove 333 is used to form a sliding contact with the bottom end of the push rod 351. Each wheel 331 is arranged in a one-to-one correspondence with the punch 350, so that each punch 350 is driven and pushed by the corresponding wheel 331, ensuring the stability and consistency of the impact action.

[0045] In this embodiment, the hammer sleeve 340 is fitted onto the outer periphery of the rotating wheel assembly 330, and a gap is provided between its inner side and the outer periphery of the rotating wheel assembly 330 to avoid interference between the hammer sleeve 340 and the rotating wheel assembly 330 during rotation.

[0046] The hammer sleeve 340 has sliding guides 342 fixedly installed on both sides of the sliding box 310. The sliding guides 342 are used to guide the axial movement of the hammer sleeve 340, so that the hammer sleeve 340 slides stably along the axial direction during the impact process.

[0047] In this embodiment, the punch block 350 is a metal counterweight structure with a large mass. Driven by the rotary wheel assembly 330, the punch block 350 periodically impacts the top surface of the hammer sleeve 340 under the elastic restoring force of the spring 352 and its own weight. The impact force is transmitted to the bushing position through the hammer sleeve 340, hammer head 341, and pressure column head 400, providing a vibration and impact effect for the bushing pressing process.

[0048] Working principle and usage process of this invention: When using this invention, firstly, according to the specifications of the internal combustion engine connecting rod to be pressed, a mold module 121 that is compatible with its structure is selected, and the mold module 121 is installed on the corresponding jaw surface of the three-jaw chuck 120. The internal combustion engine connecting rod is limited, clamped and positioned by the groove on the surface of the mold module 121. Then, the internal combustion engine connecting rod is tooled on the positioning tray 110, and the bushing to be pressed is placed at the corresponding position of the internal combustion engine connecting rod.

[0049] After the workpiece is clamped, the drive component 210 drives the vibratory hammer assembly 300 to move axially downward inside the press-fit drive box 200, thereby driving the vibratory hammer assembly 300 and the press head 400 detachably connected to its bottom end to move downward synchronously, applying axial pressing force to the bushing, and realizing the initial press-fit positioning of the bushing.

[0050] Furthermore, during the pressing process, the motor 320 drives the roller assembly 330 to rotate at high speed. The staggered spiral teeth 332 on the surface of the roller assembly 330 push the punch block 350 and the bottom rod 351 that slide against it in sequence during the rotation. After the spiral teeth 332 disengage from the bottom rod 351, the punch block 350 quickly moves downward under its own weight and the elastic restoring force of the spring 352, and generates a periodic impact on the top surface of the hammer sleeve 340.

[0051] The hammer sleeve 340 slides stably along the axial direction under the guidance of the sliding guide 342. The impact force it bears is transmitted to the pressure column head 400 through the hammer head 341. Thus, while applying axial pressing force to the bushing, the vibration impact effect is superimposed, so that the bushing overcomes the assembly resistance and stably enters the target installation position during the pressing process, and finally completes the high-stability pressing operation of the internal combustion engine connecting rod bushing.

[0052] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pressing and positioning device for connecting rod bushings of an internal combustion engine, characterized in that, include: A support frame (100) is provided with a positioning tray (110) fixed on its surface. The positioning tray (110) is provided with a three-jaw chuck (120) for positioning the connecting rod of the internal combustion engine. A press-fit drive box (200) is arranged relative to the surface of a three-jaw chuck (120); Vibrating hammer assembly (300) is slidably sleeved inside the press-fit drive box (200). The press-fit drive box (200) drives the vibrating hammer assembly (300) to move downward as a whole, applying axial press-fit force to the bushing. The vibratory hammer assembly (300) includes a sliding box (310), a motor (320), a rotating wheel assembly (330), several punches (350), and a hammer sleeve (340) slidably installed inside the sliding box (310). The motor (320) is fixed to one side of the sliding box (310) to drive the rotating wheel assembly (330) to rotate. The bottom end of the punches (350) is provided with a stop rod (351) that penetrates the top surface of the hammer sleeve (340) and slides against the surface of the rotating wheel assembly (330). The top surface of the punches (350) is provided with a spring (352) that abuts against the top surface of the inner cavity of the hammer sleeve (340). During the rotation of the rotating wheel assembly (330), the punches (350) are pushed to reciprocate to impact the top of the hammer sleeve (340).

2. The connecting rod bushing press-fitting and positioning device for an internal combustion engine according to claim 1, characterized in that: The three-jaw chuck (120) has a shaped module (121) movably mounted on the surface of each jaw, and the surface of the shaped module (121) is provided with a groove adapted to the connecting rod of the internal combustion engine.

3. The internal combustion engine connecting rod bushing press-fitting and positioning device according to claim 1, characterized in that: An adjusting rack (130) is movably installed at the top of the stand (100), and the press-fit drive box (200) is fixed to one end of the adjusting rack (130). The position of the press-fit drive box (200) is adjusted by the lateral sliding of the adjusting rack (130).

4. The internal combustion engine connecting rod bushing press-fitting and positioning device according to claim 1, characterized in that: A drive component (210) is fixedly installed inside the press-fit drive box (200), and a toothed rod (220) for meshing with the output end of the drive component (210) is fixedly installed on the surface of the press-fit drive box (200) for driving the vibratory hammer assembly (300) to press down.

5. The internal combustion engine connecting rod bushing press-fitting and positioning device according to claim 1, characterized in that: The wheel assembly (330) includes several wheel disks (331), each wheel disk (331) is arranged along the axis, and each wheel disk (331) has spiral teeth (332) arranged symmetrically about the center of the wheel assembly (330) on its surface. The spiral teeth (332) on the surface of each wheel disk (331) are arranged in an alternating manner.

6. The connecting rod bushing press-fitting and positioning device for an internal combustion engine according to claim 5, characterized in that: The outer periphery of the wheel (331) and the spiral tooth (332) is provided with a sliding groove (333) that slides against the bottom end of the push rod (351), and the wheel (331) and the punch (350) are arranged in a one-to-one correspondence.

7. The internal combustion engine connecting rod bushing press-fitting and positioning device according to claim 1, characterized in that: The hammer sleeve (340) is fitted onto the outer periphery of the rotating wheel assembly (330), and the inner side of the hammer sleeve (340) has a gap with the outer periphery of the rotating wheel assembly (330). The bottom end of the hammer sleeve (340) is provided with a hammer head (341), and the two sides of the hammer sleeve (340) are provided with sliding guides (342) fixed to the inner side of the sliding box (310) for guiding the hammer sleeve (340) to slide along the axial direction.

8. The internal combustion engine connecting rod bushing press-fitting and positioning device according to claim 1, characterized in that: The punch block (350) is a metal counterweight structure.

9. The connecting rod bushing press-fitting and positioning device for an internal combustion engine according to claim 1, characterized in that: The bottom end of the vibratory hammer assembly (300) is detachably connected to a pressure column head (400) via a hammer head (341).

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