Pressing device for automobile connecting rod bushing

Abstract

The utility model discloses a press -fitting device of automobile connecting rod bushing, and its technical key points are: including machine table and down -pressing spare, be provided with positioning mechanism on the machine table, and positioning mechanism includes connecting rod positioning sleeve, and the connecting rod positioning sleeve is set up with threaded hole, and the threaded hole is screw threaded and is connected with the replacement rod in the threaded hole, and the top of replacement rod is provided with the placement section, and the inside of machine table is provided with the drive mechanism of driving replacement rod rotation and realizes the drive mechanism of lifting. Advantages are through utilization three -level coaxial structure, and the coaxial between connecting rod small head hole and connecting rod positioning sleeve, and the coaxial between bushing and replacement rod and the coaxial between connecting rod positioning sleeve and replacement rod are converted into the coaxial between bushing and connecting rod small head hole, and compared with the form of dynamic compensation of floating press -fitting scheme, and this form belongs to static structure, and the core only involves the connection relation between four components, and the structure is simpler, and the use difficulty and maintenance cost have been reduced.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing technology, and in particular to a press-fitting device for automobile connecting rod bushings. Background Technology

[0002] Automotive connecting rod bushings, also known as connecting rod small end bushings or piston pin bushings, are thin-walled, hollow sliding bearings press-fitted into the small end bore of the connecting rod. Their core function is to provide a low-friction, high-wear-resistant rotating support surface for the piston pin, smoothly transmitting the piston's explosive force to the connecting rod, while also withstanding huge alternating loads and violent oscillations.

[0003] Since the bushing plays a role similar to a bearing, its installation accuracy is crucial, and it needs to be interference-fitted with the small end of the connecting rod. Therefore, it can only be forcibly pressed into the hole by press fitting. This requires that the bushing and the small end hole must be strictly coaxial. Once misalignment occurs, additional friction will be generated, which will affect the accuracy and service life.

[0004] Currently, floating press fitting technology is generally used to compensate for errors and improve the fault tolerance rate, thereby ensuring the alignment between the bushing and the small end hole. However, the principle and structure of floating press fitting equipment are relatively complex, and the cost of use is high and the maintenance is difficult. Utility Model Content

[0005] In order to solve the above problems, this utility model provides a press-fitting device for automotive connecting rod bushings.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a pressing device for automotive connecting rod bushings, including a machine base and a pressing component. A positioning mechanism is provided on the machine base. The positioning mechanism includes a connecting rod positioning sleeve disposed on the machine base for fixing the small end of the connecting rod. A threaded hole is opened at the center of the bottom of the connecting rod positioning sleeve. A replacement rod is threadedly connected to the threaded hole. A placement section for placing the bushing is provided at the top of the replacement rod. A drive mechanism is provided inside the machine base to drive the replacement rod to rotate and realize lifting and lowering.

[0007] By adopting the above configuration: the connecting rod positioning sleeve is coaxial with the connecting rod small end hole, the replacement rod is coaxial with the bushing, and the replacement rod is made coaxial with the connecting rod positioning sleeve through the threaded hole, thereby achieving coaxiality between the connecting rod small end hole and the bushing, thus achieving a high centering positioning effect. At this time, the lower pressure piece is used to press down and press the bushing into the connecting rod small end hole, so that the replacement rod is replaced by the bushing, thereby achieving the press-fitting of the bushing and the connecting rod.

[0008] Furthermore, the machine base is also provided with two auxiliary frames on the left and right, each of which has a notch. The notches on the left and right sides are closed to form a centering hole coaxial with the threaded hole, and the top of the replacement rod passes through the centering hole.

[0009] By adopting the above settings, the auxiliary frame can use the centering hole and the threaded hole to perform two-point positioning of the replacement rod, so that the position of the replacement rod is fixed and will not shift at the top, thereby ensuring that the replacement rod and the connecting rod positioning sleeve are always in a coaxial state, ensuring the subsequent pressing effect.

[0010] Furthermore: the replacement rod is divided into a lower threaded section and an upper smooth section, the diameter of the centering hole is equal to the diameter of the smooth section, and the placement section is located at the top of the smooth section.

[0011] By adopting the above configuration, the smooth section can protect the inner wall of the bushing, preventing the threads from scratching the inner wall of the bushing, while the centering hole with the same diameter as the smooth section can further fix the axial direction of the replacement rod, thereby further ensuring that the replacement rod and the connecting rod positioning sleeve are in a coaxial state.

[0012] Furthermore, the diameter of the placement section is equal to the inner diameter of the bushing, and the difference between the diameter of the smooth section and the placement section is less than half the bushing wall thickness.

[0013] Furthermore: a sliding groove is provided on the machine base, the bottom of the auxiliary frame slides in the sliding groove, and the left and right auxiliary frames are fixed to each other by buckles.

[0014] Furthermore: the machine tool has a chamber, the drive mechanism includes a motor disposed in the chamber, the output end of the motor is fixed with a drive gear, a fixing component is also disposed in the chamber, a nut sleeve is rotatably connected to the fixing component, the nut sleeve is threadedly connected to the replacement rod, and a driven gear that meshes with the drive gear is disposed outside the nut sleeve.

[0015] By adopting the above configuration, the motor and nut sleeve transform the replacement rod into a screw-like structure, allowing the replacement rod itself to move up and down along the axial direction of the threaded hole, thereby making room for the bushing. In conjunction with the downward pressing of the pressing component, the bushing can be pressed into the connecting rod more quickly.

[0016] Furthermore: the fixing member includes multiple fixing rods fixedly connected to the inner wall of the chamber, the multiple fixing rods intersect and form an intersection at the intersection point, and a rotating sleeve is provided at the upper end of the nut sleeve, the rotating sleeve being rotatably connected to the intersection.

[0017] By adopting the above settings, the fixing rod can fix and limit the nut sleeve, so that it can only rotate in a fixed position, thereby preventing it from shaking and ensuring that the replacement rod can smoothly descend into the cavity through the thread.

[0018] Furthermore: a material handling window is provided on the side of the machine tool, and the material handling window is connected to the chamber. By adopting the above settings, the material handling window can retrieve the replaced rod, preparing it for the next press fitting.

[0019] In summary, this utility model has the following beneficial effects: By utilizing a three-stage coaxial structure, the coaxiality between the connecting rod small end hole and the connecting rod positioning sleeve, the coaxiality between the bushing and the replacement rod, and the coaxiality between the connecting rod positioning sleeve and the replacement rod are transformed into the coaxiality between the bushing and the connecting rod small end hole. Compared with the floating press-fitting scheme which uses dynamic compensation, this form is a static structure, and the core only involves the connection relationship between four components. The structure is simpler, and the difficulty of use and maintenance costs are reduced. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a partial sectional view of the present invention.

[0022] Figure 3 yes Figure 2 Enlarged view of point A.

[0023] Figure 4 This is a schematic diagram of the structure of this utility model after removing the machine base and auxiliary frame.

[0024] Figure 5 This is a structural schematic diagram of the connecting rod positioning sleeve in this utility model.

[0025] Figure 6 This is a schematic diagram of the replacement rod in this utility model.

[0026] Explanation of reference numerals in the attached figures: 1. Machine base; 11. Slide groove; 12. Chamber; 13. Fixing component; 131. Fixing rod; 132. Cross section; 14. Material pick-up window; 2. Pressing component; 3. Positioning mechanism; 31. Connecting rod positioning sleeve; 311. Threaded hole; 32. Replacement rod; 321. Threaded section; 322. Smooth section; 33. Auxiliary frame; 331. Notch; 4. Drive mechanism; 41. Motor; 42. Drive gear; 43. Nut sleeve; 431. Rotating sleeve; 44. Driven gear. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 and Figure 2As shown, the pressing device for automotive connecting rod bushings includes a machine base 1 and a lower pressing component 2. A positioning mechanism 3 is provided on the machine base 1. The positioning mechanism 3 includes a connecting rod positioning sleeve 31, which is mounted on the machine base 1 and used to fix the small end of the connecting rod. The connecting rod positioning sleeve 31 is used to position the small end of the connecting rod. Since both the small end of the connecting rod and the connecting rod positioning sleeve 31 are in a stationary fixed state in the device, it is extremely easy to make the small end hole of the connecting rod and the connecting rod positioning sleeve 31 coaxial. A threaded hole 311 is opened at the center of the bottom of the connecting rod positioning sleeve 31. A replacement rod 32 is internally threaded into the threaded hole 311. Since the replacement rod 32 is connected to the center of the connecting rod positioning sleeve 31, the two are also coaxial. The top of the replacement rod 32 is provided with a placement section 323 for placing the bushing. The replacement rod 32 is cylindrical, so the bushing and the replacement rod 32 can be easily made coaxial. Thus, the small end hole of the connecting rod is transferred twice through the connecting rod positioning sleeve 31 and the replacement rod 32 to form a coaxial shape with the bushing. Moreover, the coaxial state can be corrected by both the replacement rod 32 and the connecting rod positioning sleeve 31 at the same time. Therefore, the alignment between the two is high. After the pressing part 2 presses down to press the bushing into the small end hole of the connecting rod, the pressing quality is high, and the structure is also relatively simple. Only the connecting rod positioning sleeve 31 and the replacement rod 32 need to be maintained, which greatly reduces the difficulty of operation and the cost of maintenance.

[0029] like Figure 1 and Figure 5 As shown, the machine base 1 is also equipped with two auxiliary frames 33 on the left and right. Each auxiliary frame 33 is provided with a notch 331. The two notches 331 are closed to form a centering hole coaxial with the threaded hole 311. The top of the replacement rod 32 passes through the centering hole. The centering hole allows the auxiliary frame 33 to be aligned with the threaded hole 311. Using the principle that two points determine a straight line, the axial direction of the replacement rod 32 is made to coincide with the axial direction of the threaded hole 311, thereby further ensuring the accuracy during pressing. The machine base 1 is provided with a sliding groove 11. The bottom of the auxiliary frame 33 slides in the sliding groove 11. The two auxiliary frames 33 on the left and right are fixed to each other by a buckle. The split auxiliary frame 33 can be used to assist in positioning the replacement rod 32 during the preparation stage and can be removed after pressing begins to prevent it from affecting the pressing process and ensure the smooth progress of the pressing work.

[0030] like Figure 4 and Figure 6As shown, the replacement rod 32 is divided into a lower threaded section 321 and an upper smooth section 322. The smooth section 322 can prevent the threads from damaging the inner wall of the bushing, thus protecting the bushing and ensuring installation accuracy. The diameter of the centering hole is equal to the diameter of the smooth section 322. The placement section 323 is located at the top of the smooth section 322. The diameter of the placement section 323 is equal to the inner diameter of the bushing. The difference between the diameters of the smooth section 322 and the placement section 323 is less than half the bushing wall thickness. The same diameter allows the replacement rod 32 and the bushing to form a transition fit, thus ensuring a high degree of alignment between them and avoiding errors caused by slight displacement of the bushing during subsequent pressing, further ensuring installation accuracy.

[0031] like Figures 3 to 5 As shown, the machine tool 1 is equipped with a drive mechanism 4 for rotating the replacement rod 32. The drive mechanism 4 allows the replacement rod 32 to be removed from the bottom by loosening the threads. During the removal process, the bushing enters the small end hole of the connecting rod along with the replacement rod 32, and under the action of the pressing member 2, it is interference-fitted with the small end hole of the connecting rod, thereby completing the entire pressing process and realizing the function of replacing the replacement rod 32 with the bushing. The machine tool 1 has a chamber 12. The drive mechanism 4 includes a motor 41 installed in the chamber 12. The output end of the motor 41 is fixed with a drive gear 42. A fixing member 13 is also installed in the chamber 12. A nut sleeve 43 is rotatably connected to the fixing member 13. The nut sleeve 43 and the replacement rod 32 are connected to each other. The threaded connection and the nut sleeve 43 are provided with a driven gear 44 that meshes with the driving gear 42. The above configuration makes the replacement rod 32 actually form a screw structure after preparation. It can be driven to rise and fall by the motor 41, which is conducive to the replacement rod 32 being withdrawn from below and also conducive to its cooperation with the pressing part 2. The fixing part 13 includes multiple fixing rods 131 that are fixedly connected to the inner wall of the chamber 12. The multiple fixing rods 131 intersect each other and the intersection point forms an intersection part 132. The upper end of the nut sleeve 43 is provided with a rotating sleeve 431, which is rotatably connected to the intersection part 132. The side of the machine base 1 is provided with a material picking window 14, which is connected to the chamber 12.

[0032] Working process: First, place the small end of the connecting rod into the connecting rod positioning sleeve 31. The inner wall of the connecting rod positioning sleeve 31 matches the outer wall of the small end of the connecting rod, so that the hole of the small end of the connecting rod is coaxial with the connecting rod positioning sleeve 31. Then, thread the replacement rod 32 into the threaded hole 311. At this time, the auxiliary frame 33 can be closed to position the replacement rod 32, so that the replacement rod 32 moves along the determined axis. Continue to rotate the replacement rod 32 until its bottom is screwed into the nut sleeve 43. At this time, the auxiliary frame 33 can be removed and the bushing can be placed on the smooth section 322. Start the press. At the same time as the lower pressing part 2 presses down, the motor 41 starts. The bushing descends with the replacement rod 32 and is pressed into the hole of the small end of the connecting rod by the lower pressing part 2, thus completing the installation of the connecting rod bushing. At this time, the replacement rod 32 will be completely inserted into the chamber 12. The replacement rod 32 can be taken out through the material removal window 14 and the next pressing can begin.

[0033] The scope of protection of this utility model includes, but is not limited to, the above embodiments. The scope of protection of this utility model is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art shall fall within the scope of protection of this utility model.

Claims

1. A pressing device for automotive connecting rod bushings, comprising a machine base (1) and a pressing component (2), wherein a positioning mechanism (3) is provided on the machine base (1), characterized in that: The positioning mechanism (3) includes a connecting rod positioning sleeve (31) set on the machine base (1) and used to fix the small end of the connecting rod. A threaded hole (311) is provided at the bottom center of the connecting rod positioning sleeve (31). A replacement rod (32) is threadedly connected to the threaded hole (311). A placement section (323) for placing a bushing is provided at the top of the replacement rod (32). A drive mechanism (4) is provided inside the machine base (1) to drive the replacement rod (32) to rotate and realize lifting.

2. The pressing device for automotive connecting rod bushings as described in claim 1, characterized in that: The machine base (1) is also provided with two auxiliary frames (33) on the left and right sides. Each auxiliary frame (33) is provided with a notch (331). The notches (331) on the left and right sides are closed to form a centering hole coaxial with the threaded hole (311). The top of the replacement rod (32) passes through the centering hole.

3. The pressing device for automotive connecting rod bushings as described in claim 2, characterized in that: The replacement rod (32) is divided into a lower threaded section (321) and an upper smooth section (322). The diameter of the centering hole is equal to the diameter of the smooth section (322), and the placement section (323) is located on top of the smooth section (322).

4. The pressing device for automotive connecting rod bushings as described in claim 3, characterized in that: The diameter of the placement section (323) is equal to the inner diameter of the bushing, and the difference between the diameter of the smooth section (322) and the diameter of the placement section (323) is less than half the thickness of the bushing wall.

5. The pressing device for automotive connecting rod bushings as described in claim 3, characterized in that: The machine base (1) is provided with a slide groove (11), the bottom of the auxiliary frame (33) slides in the slide groove (11), and the two auxiliary frames (33) on the left and right are fixed to each other by a buckle.

6. The pressing device for automotive connecting rod bushings as described in claim 1, characterized in that: The machine base (1) has a chamber (12). The drive mechanism (4) includes a motor (41) installed in the chamber (12). The output end of the motor (41) is fixed with a drive gear (42). A fixing member (13) is also installed in the chamber (12). A nut sleeve (43) is rotatably connected to the fixing member (13). The nut sleeve (43) is threadedly connected to the replacement rod (32). A driven gear (44) that meshes with the drive gear (42) is installed outside the nut sleeve (43).

7. The pressing device for automotive connecting rod bushings as described in claim 6, characterized in that: The fixing member (13) includes multiple fixing rods (131) fixedly connected to the inner wall of the chamber (12). The multiple fixing rods (131) intersect and form a cross part (132) at the intersection point. The upper end of the nut sleeve (43) is provided with a rotating sleeve (431), and the rotating sleeve (431) is rotatably connected to the cross part (132).

8. The pressing device for automotive connecting rod bushings as described in claim 6, characterized in that: The machine tool (1) has a material picking window (14) on its side, and the material picking window (14) is connected to the chamber (12).

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