Connecting rod copper bush assembly tool and assembly method

Abstract

The invention relates to a connecting rod copper bush assembling tool which comprises a pressing head installed on a press machine, a circular pressing plate fixed to the lower end of the pressing head and a cylindrical supporting base fixed to the pressing plate and capable of being inserted into a copper bush, two positioning pins capable of being inserted into or moved out of copper bush oil holes are arranged on the supporting base, and the positioning pins are connected with a linkage telescopic mechanism. The upper end of the rotating shaft is rotationally connected with the pressing plate, the driving lever is used for driving the rotating shaft to rotate, the torsional spring is arranged on the rotating shaft in a sleeving mode and used for resetting the driving lever, a connecting plate is fixed to the lower end of the rotating shaft, and the two positioning pins are connected with the connecting plate through connecting arms respectively. A limiting piece used for limiting the shifting rod is installed on the pressing plate. According to the invention, the problem of unqualified product quality caused by inaccurate oil hole alignment is avoided, and the production quality and the production efficiency of the product are improved.

Description

Technical Field

[0001] The invention relates to the technical field of connecting rod production, and in particular to an assembly tool and an assembly method for a connecting rod copper sleeve. Background Art

[0002] During the production of the connecting rod, a copper sleeve needs to be installed in the piston pin hole. The copper sleeve has good wear resistance, thermal conductivity and reliability, and can effectively reduce the wear and friction between the piston pin and the pin hole, while playing the role of lubrication and cooling. Two oil holes are respectively set on the copper sleeve and the piston pin hole wall. When installing the copper sleeve, the oil holes on the copper sleeve need to correspond to the oil holes on the piston pin hole wall one by one.

[0003] At present, when installing the copper sleeve, the staff aligns the oil holes on the copper sleeve and the piston pin hole wall by naked eye observation, and then presses the copper sleeve into the piston pin hole by a press. Due to the error of manual observation, the oil holes of the copper sleeve are often misaligned after installation, resulting in unqualified product quality, which seriously affects the production quality and production efficiency of the connecting rod. Therefore, there is an urgent need for an assembly tool that can easily install the copper sleeve into the piston pin hole and accurately align the oil holes of the two. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a connecting rod copper sleeve assembly tool and an assembly method.

[0005] According to a first aspect of the present invention, there is provided a connecting rod copper sleeve assembly tool, comprising a pressing head mounted on a press machine, a circular pressing plate fixed to the lower end of the pressing head, and a cylindrical supporting seat fixed to the pressing plate and capable of being inserted into the interior of the copper sleeve, two positioning pins capable of being inserted into or removed from the oil holes of the copper sleeve are arranged on the supporting seat, and the positioning pins are connected to a linked telescopic mechanism; the linked telescopic mechanism comprises a rotating shaft rotatably connected to the pressing plate at the upper end, a lever for driving the rotating shaft to rotate, and a torsion spring sleeved on the rotating shaft and used for resetting the lever, a connecting plate is fixed to the lower end of the rotating shaft, and two positioning pins are connected to the connecting plate via a connecting arm respectively; a limiting member for limiting the position of the lever is installed on the pressing plate.

[0006] Preferably, two pin holes are provided on the support seat, and a positioning pin is inserted into each pin hole. Through the linked telescopic mechanism, the end of the positioning pin can be controlled to extend out of the pin hole to be inserted into the oil hole of the copper sleeve, or the end of the positioning pin can be controlled to retract into the pin hole to be moved out of the oil hole of the copper sleeve.

[0007] Preferably, the upper end of the support seat is fixed to the pressing plate, and the lower end is fixed to the cover plate, and the bottom thereof is sealed by the cover plate.

[0008] Preferably, the lower end of the lever is fixed to the shaft through a crossbar, a circular arc through hole centered on the shaft is provided on the pressure plate, and the upper end of the lever passes through the circular arc through hole and extends above the pressure plate. The shaft is rotated by toggling the lever, and the rotation of the shaft drives the positioning pin to extend out of the pin hole through the connecting plate and the connecting arm.

[0009] Preferably, one end of the connecting arm is hinged to the positioning pin, and the other end is hinged to the connecting plate.

[0010] Preferably, the position-limiting member comprises a fixed block fixed on the pressure plate, a first rotating arm hinged with the fixed block, and a stopper fixed at one end of the first rotating arm for blocking the lever. In a natural state, one end of the first rotating arm on which the stopper is mounted naturally droops. The two side wings of the torsion spring block one side of the lever. When the positioning pin needs to extend out of the pin hole, the lever is moved to overcome the elastic force of the torsion spring and move toward the direction close to the first rotating arm. When the lever moves to the bottom of the first rotating arm, the stopper blocks the lever and limits it. The positioning pin extends out of the pin hole and is inserted into the copper sleeve oil hole to position the copper sleeve. A placement slot for placing the connecting rod is provided on the workbench below the present invention. When the present invention is installed, the positioning pin is made to correspond one by one with the two oil holes on the connecting rod piston pin hole arm placed in the placement slot. In this way, when the connecting rod copper sleeve is assembled, after the connecting rod is placed in the placement slot, the two oil holes on the connecting rod piston pin hole arm correspond one by one with the two oil holes on the copper sleeve. The press is controlled to press the copper sleeve into the piston pin hole to complete the assembly of the copper sleeve. When installing the copper sleeve, you only need to put the copper sleeve on the support seat, and move the lever to position the copper sleeve through the positioning pin, which saves time and effort, greatly improves the work efficiency and accuracy of the copper sleeve assembly, and improves product quality.

[0011] Preferably, after the copper sleeve is inserted into the piston pin hole, in order to make the positioning pin automatically move out of the copper sleeve oil hole, the second pivot arm is hinged on the fixed block, the second pivot arm and the first pivot arm are hinged to the fixed block through the same connecting axis, and the first pivot arm and the second pivot arm are fixed by a support rod to form a U-shaped bracket.

[0012] Preferably, a vertical through hole is provided on the pressure plate below the second rotating arm, and the top shaft is inserted into the vertical through hole.

[0013] Preferably, the diameter of the upper end of the top shaft is larger than the diameter of the lower end so that the lower end of the top shaft is located below the pressure plate and the upper end of the top shaft is located above the pressure plate. When the copper sleeve is gradually pressed into the piston pin hole of the connecting rod, the lower end of the top shaft contacts the connecting rod, and the top shaft is pushed upward by the connecting rod. The top shaft moves upward to push the U-shaped bracket to rotate upward to release the limit of the lever by the block. Under the action of the torsion spring, the lever and the rotating shaft return to their original positions, and the positioning pin retracts into the pin hole, so that the positioning pin is moved out of the copper sleeve oil hole.

[0014] A second aspect of the present invention provides a method for assembling a connecting rod copper sleeve using the above-mentioned assembly tool, comprising the following steps:

[0015] (1) Manually put the copper sleeve on the outside of the support seat, adjust the copper sleeve so that the oil hole on the copper sleeve is aligned with the position of the positioning pin on the support seat, and turn the lever to drive the rotating shaft to rotate so that the positioning pin is inserted into the oil hole of the copper sleeve to position the copper sleeve, and then limit the lever by the limiter;

[0016] (2) Place the connecting rod to be assembled with the copper sleeve on the workbench, control the press to move the copper sleeve downward and press the copper sleeve into the piston pin hole of the connecting rod, then release the limit of the limiter on the lever, and reset the lever and the shaft. At this time, the positioning pin moves out of the oil hole of the copper sleeve, control the press to drive the support seat to move upward, and the support seat moves out of the copper sleeve to complete the assembly of the copper sleeve.

[0017] The beneficial effects of the present invention are:

[0018] After the copper sleeve is assembled by the present invention, the oil hole on the copper sleeve can be accurately aligned with the oil hole on the piston pin hole wall, thereby avoiding the problem of unqualified product quality caused by misaligned oil holes and improving the production quality and production efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural schematic diagram of the present invention from one perspective;

[0020] Figure 2 It is a structural schematic diagram of another perspective of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the linked telescopic mechanism and the pressing plate of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the linked telescopic mechanism of the present invention;

[0023] Figure 5 It is a schematic diagram of the lever of the present invention when it is limited;

[0024] As shown in the figure:

[0025] 1. Pressure head, 2. Pressure plate, 3. Support seat, 4. Positioning pin, 5. Rotating shaft, 6. Push rod, 7. Torsion spring, 8. Connecting plate, 9. Connecting arm, 10. Arc through hole, 11. Fixed block, 12. First rotating arm, 13. Stopper, 14. Second rotating arm, 15. Top shaft, 16. Cover plate. DETAILED DESCRIPTION

[0026] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0027] like Figure 1-5 As shown, the present invention includes a pressing head 1 installed on a press machine, a circular pressing plate 2 fixed to the lower end of the pressing head 1, and a cylindrical supporting seat 3 fixed to the pressing plate 2 and capable of being inserted into the interior of a copper sleeve, two positioning pins 4 capable of being inserted into or removed from the oil holes of the copper sleeve are arranged on the supporting seat 3, and the positioning pins 4 are connected to a linked telescopic mechanism.

[0028] The upper end of the support seat 3 is fixed to the pressing plate 2, and the lower end is fixed to the cover plate 16, and the bottom is blocked by the cover plate 16. Two pin holes are arranged on the support seat 3, and a positioning pin 4 is inserted into each pin hole. Through the linkage telescopic mechanism, the end of the positioning pin 4 can be controlled to extend out of the pin hole to be inserted into the copper sleeve oil hole, or the end of the positioning pin 4 can be controlled to be retracted into the pin hole to be moved out of the copper sleeve oil hole.

[0029] The linkage telescopic mechanism comprises a rotating shaft 5 whose upper end is rotatably connected to the pressing plate 2, a lever 6 for driving the rotating shaft 5 to rotate, and a torsion spring 7 sleeved on the rotating shaft 5 and used for resetting the lever 6. A connecting plate 8 is fixed to the lower end of the rotating shaft 5, and two positioning pins 4 are connected to the connecting plate 8 through a connecting arm 9 respectively, one end of the connecting arm 9 is hinged to the positioning pin 4, and the other end is hinged to the connecting plate 8.

[0030] The lower end of the lever 6 is fixed to the rotating shaft 5 through a cross bar, and a circular arc through hole 10 centered on the rotating shaft 5 is provided on the pressing plate 2. The upper end of the lever 6 passes through the circular arc through hole 10 and extends above the pressing plate 2. The rotating shaft 5 is rotated by toggling the lever 6, and the rotating shaft 5 drives the positioning pin 4 to extend out of the pin hole through the connecting plate 8 and the connecting arm 9. A limiting member for limiting the lever 6 is installed on the pressing plate 2, and the limiting member includes a fixed block 11 fixed on the pressing plate 2, a first rotating arm 12 hinged to the fixed block 11, and a stopper 13 fixed at one end of the first rotating arm 12 for blocking the lever 6. In a natural state, one end of the first rotating arm 12 where the stopper 13 is installed naturally droops.

[0031] The two side wings of the torsion spring 7 block one side of the lever 6. When the positioning pin 4 needs to extend out of the pin hole, the lever 6 is moved to overcome the elastic force of the torsion spring 7 and move in the direction close to the first rotating arm 12. When the lever 6 moves to the bottom of the first rotating arm 12, the lever 6 is blocked and limited by the block 13. The positioning pin 4 extends out of the pin hole and is inserted into the copper sleeve oil hole to position the copper sleeve. A placement groove for placing the connecting rod is set on the workbench below the present invention. When the present invention is installed, the positioning pin 4 is made to correspond one by one with the two oil holes on the connecting rod piston pin hole arm placed in the placement groove. In this way, when the connecting rod copper sleeve is subsequently assembled, after the connecting rod is placed in the placement groove, the two oil holes on the connecting rod piston pin hole arm correspond one by one with the two oil holes on the copper sleeve, and the press is controlled to press the copper sleeve into the piston pin hole to complete the assembly of the copper sleeve. When installing the copper sleeve, it is only necessary to put the copper sleeve on the support seat 3, and the lever 6 is moved to position the copper sleeve through the positioning pin 4, which saves time and labor, greatly improves the work efficiency and accuracy of the copper sleeve assembly, and improves the product quality.

[0032] When the copper sleeve is inserted into the piston pin hole, in order to make the positioning pin 4 automatically move out of the copper sleeve oil hole, the second rotating arm 14 is hinged on the fixed block 11, and the second rotating arm 14 and the first rotating arm 12 are hinged to the fixed block 11 through the same connecting axis. The first rotating arm 12 and the second rotating arm 14 are fixed by a support rod to form a U-shaped bracket.

[0033] A vertical through hole is provided on the pressure plate 2 below the second rotating arm 14, and a top shaft 15 is inserted into the vertical through hole. The diameter of the upper end of the top shaft 15 is larger than the diameter of the lower end so that the lower end of the top shaft 15 is located below the pressure plate 2, and the upper end of the top shaft 15 is located above the pressure plate 2. When the copper sleeve is gradually pressed into the piston pin hole of the connecting rod, the lower end of the top shaft 15 contacts the connecting rod, and the top shaft 15 is pushed upward by the connecting rod. The top shaft 15 moves upward and pushes the U-shaped bracket to rotate upward to release the limit of the block 13 on the lever 6. Under the action of the torsion spring 7, the lever 6 and the rotating shaft 5 return to their original positions, and the positioning pin 4 retracts into the pin hole, so that the positioning pin 4 is moved out of the copper sleeve oil hole.

[0034] The method for assembling the connecting rod copper sleeve using the above-mentioned assembly tool comprises the following steps:

[0035] (1) First, manually put the copper sleeve on the outside of the support seat 3, adjust the copper sleeve so that the oil hole on the copper sleeve is aligned with the positioning pin 4 on the support seat 3, then move the lever 6 to move the lever 6 to the bottom of the first rotating arm 12 and limit the lever 6 through the stopper 13, and the lever 6 drives the rotating shaft 5 to rotate so that the positioning pin 4 is inserted into the oil hole of the copper sleeve to position the copper sleeve;

[0036] (2) Place the connecting rod to be assembled with the copper sleeve on the workbench, control the press to drive the copper sleeve downward and press the copper sleeve into the piston pin hole of the connecting rod. When the lower end of the top shaft 15 contacts the connecting rod, the top shaft 15 is pushed up by the connecting rod to rotate the U-shaped bracket, release the limit on the lever 6, and the lever 6 and the rotating shaft 5 are reset. At this time, the positioning pin 4 is moved out of the oil hole of the copper sleeve, and the press is controlled to drive the present invention to move upward, and the support seat 3 is moved out of the copper sleeve to complete the assembly of the copper sleeve.

[0037] After the copper sleeve is assembled by the present invention, the oil hole on the copper sleeve can be accurately aligned with the oil hole on the piston pin hole wall, thereby avoiding the problem of unqualified product quality caused by misaligned oil holes and improving the production quality and production efficiency of the product.

[0038] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A connecting rod copper sleeve assembly tool, characterized in that: It includes a pressing head installed on a press machine, a circular pressing plate fixed to the lower end of the pressing head, and a cylindrical supporting seat fixed to the pressing plate and capable of being inserted into the interior of a copper sleeve. Two positioning pins capable of being inserted into or removed from the oil holes of the copper sleeve are arranged on the supporting seat, and the positioning pins are connected to a linked telescopic mechanism; the linked telescopic mechanism includes a rotating shaft rotatably connected to the pressing plate at the upper end, a shifting rod for shifting the rotating shaft to rotate, and a torsion spring sleeved on the rotating shaft and used for resetting the shifting rod, a connecting plate is fixed to the lower end of the rotating shaft, and two positioning pins are connected to the connecting plate via a connecting arm respectively; a limiting member for limiting the shifting rod is installed on the pressing plate.

2. The connecting rod copper sleeve assembly tool according to claim 1, characterized in that: Two pin holes are arranged on the support seat, and a positioning pin is inserted into each pin hole. Through the linkage telescopic mechanism, the end of the positioning pin can be controlled to extend out of the pin hole to be inserted into the oil hole of the copper sleeve, or the end of the positioning pin can be controlled to be retracted into the pin hole to be moved out of the oil hole of the copper sleeve.

3. The connecting rod copper sleeve assembly tool according to claim 1, characterized in that: The lower end of the lever is fixed to the rotating shaft through a cross bar, a circular arc through hole centered on the rotating shaft is arranged on the pressing plate, and the upper end of the lever passes through the circular arc through hole and extends to above the pressing plate.

4. The connecting rod copper sleeve assembly tool according to claim 1, characterized in that: One end of the connecting arm is hinged to the positioning pin, and the other end is hinged to the connecting plate.

5. The connecting rod copper sleeve assembly tool according to claim 1, characterized in that: The limiting member includes a fixed block fixed on the pressure plate, a first rotating arm hinged to the fixed block, and a stopper fixed at one end of the first rotating arm for blocking the shifting rod. In a natural state, one end of the first rotating arm where the stopper is mounted naturally droops.

6. The connecting rod copper sleeve assembly tool according to claim 5, characterized in that: The second rotating arm is hinged on the fixed block, the second rotating arm and the first rotating arm are hinged to the fixed block through the same connecting shaft, and the first rotating arm and the second rotating arm are fixed through a supporting rod to form a U-shaped bracket.

7. The connecting rod copper sleeve assembly tool according to claim 6, characterized in that: A vertical through hole is arranged on the pressing plate below the second rotating arm, and a top shaft is inserted into the vertical through hole.

8. A method for assembling a connecting rod copper bushing using the assembly tool according to any one of claims 1 to 7, comprising the following steps: (1) Manually put the copper sleeve on the outside of the support seat, adjust the copper sleeve so that the oil hole on the copper sleeve is aligned with the position of the positioning pin on the support seat, and turn the lever to drive the rotating shaft to rotate so that the positioning pin is inserted into the oil hole of the copper sleeve to position the copper sleeve, and then limit the lever by the limiter; (2) Place the connecting rod to be assembled with the copper sleeve on the workbench, control the press to move the copper sleeve downward and press the copper sleeve into the piston pin hole of the connecting rod, then release the limit of the limiter on the lever, and reset the lever and the shaft. At this time, the positioning pin moves out of the oil hole of the copper sleeve, control the press to drive the support seat to move upward, and the support seat moves out of the copper sleeve to complete the assembly of the copper sleeve.

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