Hydraulic tappet press-fitting device for automobile rocker arm assembly

Abstract

The invention discloses a hydraulic tappet press-fitting device for an automobile rocker arm assembly, which is used for manufacturing automobile parts. The guide rod is fixed on the bottom plate, the spring is sleeved on the guide rod, a center hole of the guide sleeve is sleeved on the guide rod from the upper portion of the guide rod, the bottom of the guide sleeve abuts against the upper end face of the spring, a center hole of the upper end of the clamp body positioning seat penetrates through the guide sleeve and is fixed on the bottom plate, and the guide sleeve is respectively matched with the guide rod and the clamp body positioning seat in a sliding mode. The cylinder push rod is connected with the pressure head through the pressure sensor, the ultrathin cylinder is connected with the pedal switch through the pneumatic pressure stabilizing valve and the time relay, and the air source provides air pressure for the ultrathin cylinder through the pneumatic pressure stabilizing valve. The hydraulic tappet press-fitting device can greatly reduce operation difficulty and labor intensity of operators, can effectively guarantee press-fitting time and pressure consistency, the pressure and the time are automatically monitored by the device, machining precision and uniformity of a rocker arm assembly can be greatly improved, the hydraulic tappet is normal in elasticity and free of the softening phenomenon after press-fitting, the structure is simple, manufacturing cost is low, and the device is suitable for popularization and application. The action reliability is high.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts manufacturing, in particular to a device for press-fitting a hydraulic tappet of a rocker arm assembly of an automobile engine. Background Art

[0002] In the automobile valve distribution system, the valve rocker arm assembly is a very important component. In order to ensure the normal opening of the valve and the need for manual adjustment of the valve clearance during operation, a hydraulic tappet is newly designed for the rocker arm assembly to automatically control the valve clearance, replacing the traditional manual adjustment method of the valve adjustment screw and nut. In the prior art, in order to meet the assembly requirements of the hydraulic tappet, manual press-fitting and timing are required, which is cumbersome and has poor consistency in press-fitting time, which can easily cause insufficient oil pressure in the hydraulic tappet, resulting in softening during engine operation, thereby affecting the valve opening time and even valve falling off. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a hydraulic tappet press-fitting device for an automobile rocker arm assembly to ensure the consistency of press-fitting time and pressure.

[0004] To achieve the above-mentioned purpose of the invention, the bottom flange of the guide rod of the pressing device of the present invention is fixed on the base plate, the spring is sleeved on the outer circle of the guide rod, the center hole of the guide sleeve is sleeved on the guide rod from the upper part of the guide rod, and the bottom is pressed against the upper end surface of the spring. The upper center hole of the clamp body positioning seat passes through the guide sleeve and is fixed to the base plate through the bottom flange with a hexagon socket head screw. The guide sleeve is slidably matched with the guide rod and the clamp body positioning seat respectively; the ultra-thin cylinder is installed on the cover plate, and the cylinder push rod is connected to the pressure head through a pressure sensor; the ultra-thin cylinder is connected to the foot switch through a pneumatic pressure stabilizing valve and a time relay, and the air source provides air source for the ultra-thin cylinder through the pneumatic pressure stabilizing valve.

[0005] Furthermore, the cover plate is connected to the bottom plate through bolts to form a front open structure.

[0006] Furthermore, the cylindrical structure on the upper part of the guide sleeve is slidably matched with the upper center hole of the clamp body positioning seat, and the bottom of the guide sleeve is provided with a flange for preventing the guide sleeve from being ejected from the clamp body positioning seat by the spring, and the flange is slidably matched with the inner cavity of the clamp body positioning seat; the inner hole at the top of the guide rod, the upper part of the inner cavity of the guide sleeve and the horizontal plane of the guide rod jointly form a cavity for placing the hydraulic tappet and the gasket; the chamfer at the top of the guide sleeve is adapted to the chamfer of the rocker arm assembly hole.

[0007] Furthermore, the centers of the cylinder push rod, the pressure head, the guide sleeve, the guide rod, and the clamp body positioning seat are on the same vertical line.

[0008] Furthermore, when the spring is in a freely extended state, the cavity formed by the inner hole at the top of the guide rod, the upper part of the inner cavity of the guide sleeve and the horizontal plane of the guide rod can accommodate the hydraulic tappet and the gasket. After the hydraulic tappet and the gasket are placed in the cavity, the gasket is flush with the upper surface of the cavity.

[0009] Furthermore, the pressure sensor, ultra-thin cylinder, display, pneumatic pressure-stabilizing valve, time relay, and foot switch are connected to the equipment control system.

[0010] When press-fitting, first put the hydraulic tappet and gasket into the cavity, then fit the chamfer of the lower hole of the blind hole of the rocker arm assembly with the chamfer of the guide sleeve, step on the foot switch, the time relay starts to start timing, the air source provides air pressure for the ultra-thin cylinder, the gas drives the cylinder push rod of the ultra-thin cylinder to be pushed out after passing through the pneumatic pressure-stabilizing valve, and the cylinder push rod presses the pressure head on the upper plane of the rocker arm assembly, so that the guide sleeve presses the spring along the clamping concrete locating seat and moves downward, when the guide sleeve presses the spring to the limit position, the rocker arm assembly is press-fitted together with the hydraulic tappet and gasket.

[0011] Compared with the prior art, the present invention has the following advantages: ① Since the press-fitting device is equipped with a pneumatic pressure-stabilizing valve and a pressure sensor, during the press-fitting process, the pneumatic pressure-stabilizing valve provides stable pressure for the ultra-thin cylinder, which can quickly stabilize its output thrust, ensure that the pressure on the rocker arm assembly during the press-fitting process is stable, and can display the pressure value in real time on the display to monitor whether the press-fitting process is qualified.

[0012] ② Since the press-fitting device is equipped with a guide sleeve, during press-fitting, the operator only needs to place the rocker arm assembly on the guide sleeve, and there is no need to manually support the parts for a long time.

[0013] ③ Due to the timing delay function of the time relay of the press-fitting device, the push-out time of the ultra-thin cylinder push rod can be controlled to realize the timing pressure holding function without manual timing.

[0014] ④ This pressing device can greatly reduce the operator's operating difficulty and labor intensity, has a simple structure, low manufacturing cost and high action reliability.

[0015] ⑤ The press-fitting pressure is provided by pushing the ultra-thin cylinder through air pressure, and the time relay counts at the same time, and automatically releases after the time is up, which can effectively ensure the consistency of press-fitting time and pressure. The press-fitting pressure and time are automatically monitored by the device. The equipment is compact, the manufacturing cost is low, the production efficiency is high, the processing accuracy and uniformity of the rocker arm assembly can be greatly improved, and the elasticity of the hydraulic tappet is normal after press-fitting without softening. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 for Figure 1 Side view of.

[0018] Figure 3 It is a schematic diagram of the structure in which the combined components of the hydraulic tappet and the gasket are pressed together with the holes of the rocker arm assembly.

[0019] In the figure: 1. Base plate; 2. Hexagon socket head screw; 3. Clamp body locating seat; 4. Guide sleeve; 5. Pressure head; 6. Pressure sensor; 7. Cylinder push rod; 8. Vertical plate; 9. Cover plate; 10. Ultra-thin cylinder; 11. Display; 12. Rocker arm assembly; 13. Guide rod; 14. Spring; 15. Pneumatic pressure-stabilizing valve; 16. Time relay; 17. Foot switch; 18. Air source; 19. Cavity; 20. Hydraulic tappet; 21. Gasket. DETAILED DESCRIPTION

[0020] like Figure 1 , Figure 2 , Figure 3As shown, the cover plate 9 of the present invention is bolted to the base plate 1 through the vertical plate 8 to form a front open structure, which is convenient for the operator to press and install; the bottom flange of the guide rod 13 is fixed to the base plate 1, and the spring 14 is sleeved on the outer circle of the guide rod 13, and the center hole of the guide sleeve 4 is sleeved on the guide rod 13 from the upper part of the guide rod 13, and the bottom is pressed on the upper end surface of the spring 14, and the upper end center hole of the clamp body positioning seat 3 passes through the guide sleeve 4 and is fixed to the base plate 1 through the bottom flange with a hexagon socket cylindrical head screw 2, and the guide sleeve 4 is slidably matched with the guide rod 13, and the cylindrical structure on the upper part of the guide sleeve 4 is slidably matched with the upper end center hole of the clamp body positioning seat 3, and the bottom of the guide sleeve 4 is provided with a flange to prevent the guide sleeve 4 from being ejected from the clamp body positioning seat 3 by the spring 14, and the flange is slidably matched with the inner cavity of the clamp body positioning seat 3; the inner hole at the top of the guide rod 13, the upper part of the inner cavity of the guide sleeve 4 and the horizontal plane of the guide rod 13 jointly form a cavity for placing the hydraulic tappet 20 and the gasket 21 19, when the spring 14 is in a free extension state, the cavity 19 formed by the inner hole at the top of the guide rod 13, the upper part of the inner cavity of the guide sleeve 4 and the horizontal plane of the guide rod 13 can completely accommodate the hydraulic tappet 20 and the gasket 21. After the hydraulic tappet 20 and the gasket 21 are placed in the cavity 19, the gasket 21 is flush with the upper surface of the cavity 19, and the chamfer at the top of the guide sleeve 4 is adapted to the chamfer of the hole of the rocker arm assembly 12; since the press-fitting device is provided with the guide sleeve 4, there is no need for manual lengthening. The time supports the parts and the pressing operation can be carried out; the ultra-thin cylinder 10 is installed on the cover plate 9, the cylinder push rod 7 is connected to the pressure head 5 via the pressure sensor 6, the ultra-thin cylinder 10 is connected to the foot switch 17 via the pneumatic pressure-stabilizing valve 15 and the time relay 16, the air source 18 provides the pressing pressure for the ultra-thin cylinder 10 via the pneumatic pressure-stabilizing valve 15, and the pressure sensor 6, ultra-thin cylinder 10, display 11, pneumatic pressure-stabilizing valve 15, time relay 16, and foot switch 17 are connected to the equipment control system. The present invention provides a pneumatic pressure-stabilizing valve 15 and a pressure sensor 6 through the press-fitting device. During the press-fitting process, the ultra-thin cylinder 10 provides stable pressure for the press-fitting, can quickly stabilize its output thrust, ensure the stability of the pressure on the rocker arm assembly 12 during the press-fitting process, and can display the pressure value in real time according to the display 11 to monitor whether the press-fitting process is qualified; the time relay 16 has a timing delay function, which can control the push rod push-out time of the ultra-thin cylinder 10 to achieve a timing pressure-maintaining function without manual timing; the centers of the cylinder push rod 7, the pressure head 5, the guide sleeve 4, the guide rod 13, and the clamp body positioning seat 3 are on the same vertical line to ensure the accuracy of the hydraulic tappet 20 and the gasket 21 being pressed into the rocker arm assembly 12.

[0021] During press-fitting, first put the hydraulic tappet 20 and the gasket 21 into the cavity 19, then fit the chamfer of the lower hole of the blind hole of the rocker arm assembly 12 with the chamfer of the guide sleeve 4, step on the foot switch 17, the time relay 16 starts to start timing, the air source 18 provides air pressure for the ultra-thin cylinder 10, and the gas drives the cylinder push rod 7 of the ultra-thin cylinder 10 to push out after passing through the pneumatic pressure-stabilizing valve 15. The cylinder push rod 7 presses the pressure head 5 on the upper plane of the rocker arm assembly 12, so that the guide sleeve 4 moves along the fixture. The body positioning seat 3 presses the spring 14 to move downward. When the guide sleeve 4 presses the spring 14 to the limit position, the rocker arm assembly 12, the hydraulic tappet 20 and the gasket 21 are pressed together. The air pressure is measured by the pressure sensor 6. The display 11 can display the measured pressing pressure and the remaining pressing time, which can effectively ensure the consistency of the pressing time and pressure. The pressing pressure and time are automatically monitored by the device. After pressing, the elasticity of the hydraulic tappet 20 is normal without softening.

Claims

1. A hydraulic tappet press-fitting device for a vehicle rocker arm assembly, characterized in that: The bottom flange of the guide rod (13) is fixed on the bottom plate (1), the spring (14) is sleeved on the outer circle of the guide rod (13), the center hole of the guide sleeve (4) is sleeved on the guide rod (13) from the upper part of the guide rod (13), the bottom is pressed against the upper end surface of the spring (14), the upper center hole of the clamp body positioning seat (3) passes through the guide sleeve (4), and is fixed to the bottom plate (1) through the bottom flange with a hexagon socket head screw (2), and the guide sleeve (4) is respectively slidably matched with the guide rod (13) and the clamp body positioning seat (3); the ultra-thin cylinder (10) is mounted on the cover plate (9), and the cylinder push rod (7) is connected to the pressure head (5) through the pressure sensor (6); the ultra-thin cylinder (10) is connected to the foot switch (17) through the pneumatic pressure regulating valve (15), the time relay (16), and the air source (9) provides the press-fitting air pressure for the ultra-thin cylinder (10) through the pneumatic pressure regulating valve (15).

2. The hydraulic tappet press-fitting device for the automobile rocker arm assembly according to claim 1, characterized in that: The cover plate (9) is bolted to the bottom plate (1) via the vertical plate (8) to form a front open structure.

3. The hydraulic tappet press-fitting device for the automobile rocker arm assembly according to claim 1, characterized in that: The cylindrical structure at the upper part of the guide sleeve (4) is slidably matched with the upper center hole of the clamp body positioning seat (3); the bottom of the guide sleeve (4) is provided with a flange for preventing the guide sleeve (4) from being ejected from the clamp body positioning seat (3) by the spring (14); the flange is slidably matched with the inner cavity of the clamp body positioning seat (3); the inner hole at the top of the guide rod (13), the upper part of the inner cavity of the guide sleeve (4) and the horizontal plane of the guide rod (13) together form a cavity (19) for accommodating the hydraulic tappet (20) and the gasket (21); the chamfer at the top of the guide sleeve (4) is adapted to the chamfer of the hole of the rocker arm assembly (12).

4. The hydraulic tappet press-fitting device for the automobile rocker arm assembly according to claim 1, characterized in that: The centers of the cylinder push rod (7), the pressure head (5), the guide sleeve (4), the guide rod (13), and the clamp body positioning seat (3) are on the same vertical line.

5. The hydraulic tappet press-fitting device for the automobile rocker arm assembly according to claim 1, characterized in that: When the spring (14) is in a freely extended state, a cavity (19) formed by the inner hole at the top of the guide rod (13), the upper part of the inner cavity of the guide sleeve (4) and the horizontal plane of the guide rod (13) can accommodate the hydraulic tappet (20) and the gasket (21). After the hydraulic tappet (20) and the gasket (21) are placed in the cavity (19), the gasket (21) is flush with the upper surface of the cavity (19).

6. The hydraulic tappet press-fitting device for the automobile rocker arm assembly according to claim 1, characterized in that: The pressure sensor (6), ultra-thin cylinder (10), display (11), pneumatic pressure-stabilizing valve (15), time relay (16), and foot switch (17) are connected to the equipment control system.

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