Angle-adjustable drilling device for engine cylinder cover

By designing an engine cylinder head drilling device that includes moving, lifting and fixing mechanisms, the drilling deviation problem caused by the displacement of the cylinder head during the drilling process is solved, and stable positioning and high-precision drilling of the cylinder head are achieved.

CN120645012AInactive Publication Date: 2025-09-16HUBEI MALPASS POWER TECH CO LTD
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Patent Information

Application Number
CN202510915684.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-03
Publication Date
2025-09-16
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing engine cylinder head drilling devices are prone to drilling deviations due to cylinder head offset during the drilling process, affecting assembly quality and performance.

Method used

A drilling device was designed, which includes a moving mechanism, a lifting mechanism, a drilling mechanism, and a fixing mechanism. The moving and lifting mechanisms work together to achieve stable positioning of the cylinder head. The fixing mechanism ensures the stability of the cylinder head during the drilling process by cooperating with a support plate and a fixed clamping plate.

Benefits of technology

It effectively prevents the cylinder head from deflecting during the drilling process, improves the stability and accuracy of drilling, and ensures the assembly quality and performance of the engine cylinder head.

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Abstract

The invention belongs to the technical field of drilling, and particularly relates to an angle-adjustable engine cylinder cover drilling device which comprises an operation table, a moving mechanism is arranged on one side of the top of the operation table, a supporting pad is arranged on the top of the moving mechanism, and a lifting mechanism is arranged on the top of the supporting pad. A second hydraulic cylinder is arranged on one side of the lifting mechanism, one end of the second hydraulic cylinder is connected with a supporting disc through a bolt, one side of the supporting disc is connected with a second motor through a bolt, a drilling mechanism is arranged at one end of the second motor, and one side of the top of the operation table is connected with a fixing mechanism through a bolt. The fixing mechanism is located under the drilling mechanism. The drilling stability of the engine cylinder cover is improved, the drilling effect of the engine cylinder cover is improved, and deviation of drilling of the engine cylinder cover due to deviation of the engine cylinder cover caused by vibration in the drilling period is prevented.
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Description

Technical Field

[0001] The invention relates to the field of drilling, and in particular to an angle-adjustable drilling device for an engine cylinder cover. Background Art

[0002] The engine cylinder head is an important component of the engine and is directly related to the engine's operating quality and life. There are many machined holes on the two end faces and two side faces of the engine cylinder head. The position and size errors of these machined holes have a great impact on the quality and performance of the entire engine after assembly.

[0003] After searching, the Chinese patent application with application publication number CN221289589U discloses an angle-adjustable drilling device for an engine cylinder head. The utility model relates to the field of drilling processing technology, and in particular to an angle-adjustable drilling device for an engine cylinder head, comprising a workbench, a three-axis machine tool fixed to the bottom of the workbench, and a drilling machine installed on the three-axis machine tool. The workbench is internally rotatably connected to a rotating rod, and the tops of both ends of the rotating rod are pivotally connected to a connecting rod, and the tops of the other ends of the connecting rod are pivotally connected to a slider, and a linear motor is fixedly installed on the top of the slider, and a mounting seat is installed on the mover of the linear motor, and a clamp is installed on the mounting seat, and a mounting plate is fixed to the bottom of the workbench, which solves the problem that the total amount of the cylinder head itself is heavy. If the cylinder head is manually lifted on the assembly line to turn it over, and the cylinder head needs to be handled with care, it is easy to cause arm soreness for a long time and affect the processing efficiency.

[0004] When drilling a hole in an engine cylinder head, an existing device usually fixes the cylinder head inside the device and performs drilling on the engine cylinder head through a drilling mechanism. However, during the drilling process, the engine cylinder head may deviate, thereby causing deviation in the drilling of the engine cylinder head. Summary of the Invention

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A drilling device for an engine cylinder head with adjustable angle includes an operating table, a moving mechanism is provided on one side of the top of the operating table, and a support pad is provided on the top of the moving mechanism, a lifting mechanism is provided on the top of the support pad, and a second hydraulic cylinder is provided on one side of the lifting mechanism, one end of the second hydraulic cylinder is connected to a support plate by bolts, one side of the support plate is connected to a second motor by bolts, and one end of the second motor is provided with a drilling mechanism, one side of the top of the operating table is connected to a fixing mechanism by bolts, and the fixing mechanism is located directly below the drilling mechanism.

[0007] Preferably, the moving mechanism includes a moving seat, a screw, a first motor and a moving block, and the bottom of the moving seat is connected to the top of the operating table by bolts, a moving groove is provided on the top of the moving seat, and the opposite sides of the moving groove are rotated with the screw through bearings, one side of the moving seat is connected to the first motor by bolts, one end of the first motor is fixedly connected to the screw, the moving block is slidably connected to the inner wall of the moving groove, a threaded hole is provided on one side of the moving block, the threaded hole is threadedly connected to the screw, and the top of the moving block is connected to the bottom of the support pad by bolts.

[0008] Preferably, the lifting mechanism includes a lifting seat, a lifting block and a first hydraulic cylinder, and the bottom of the lifting seat is connected to the top of the support pad by bolts, a lifting port is opened through one side of the lifting seat near the top, the inner wall of the lifting port is slidably connected to the lifting block, one side of the lifting block is fixedly connected to one end of the second hydraulic cylinder, a mounting port is opened through the top of the lifting port, the mounting port is fixedly connected to the first hydraulic cylinder, the bottom of the first hydraulic cylinder is fixedly connected to the top of the lifting block, positioning ports are opened through the opposite sides of the lifting port, the inner walls of the two positioning ports are slidably connected with positioning blocks, and the positioning block and the lifting block are connected by bolts.

[0009] Preferably, the drilling mechanism includes a third motor, a fixed plate and a drill rod, and one end of the fixed plate is fixedly connected to one end of the second motor, a rotational connection is formed between the bottom of the fixed plate and the drill rod through a bearing, the third motor is connected to the top of the fixed plate by a bolt, and one end of the third motor is fixedly connected to the top of the drill rod.

[0010] Preferably, the fixing mechanism includes two side panels, a fixing assembly and a lifting assembly, and the bottom of the two side panels are connected to the top of the operating table by bolts. The fixing assembly consists of a support plate and two fixed splints. Slide grooves are provided on both sides of the top of the support plate, and the inner walls of the two slide grooves are slidably connected with a top block. The top of the top block is connected to the bottom of the fixed splint by bolts. A guide opening is provided on one side of the two side panels, and a guide block is slidably connected to the inner wall of the guide opening. One side of the guide block is connected to the support plate by bolts, and the operating table and the fixing assembly are connected by the lifting assembly.

[0011] The two lever arrangement comprises two guide rails, one of which is a track mounted on each of the two rails, and the other is mounted on a track mounted on either side of the guide rails, wherein the guide rails have a track mounted on either side thereof.

[0012] Preferably, a reinforcement mechanism is provided on one side of the fixing splint, and the reinforcement mechanism cooperates with the fixing mechanism.

[0013] Preferably, the reinforcement mechanism includes a push plate, two connecting seats and two reinforcement plates, and the push plate and the reinforcement plate are connected by a transmission member, one side of the two connecting seats is connected to the fixed clamping plate by bolts, a damper is connected between one side of the connecting seat and the reinforcement plate by bolts, the outer wall of the damper is sleeved with a first spring, and anti-slip grooves are provided on one side of the push plate and one side of the reinforcement plate.

[0014] Preferably, the transmission component consists of two slides, two push rods, two swing frames and two swing plates. A slot is provided on one side of the fixed splint. The two slides are slidably connected to both sides of the inner wall of the slot. The two ends of the push rod are connected to one side of the push plate and the slide by hinges. The two push rods are distributed in an eight-shaped shape. A second spring is connected between the two slides by bolts. One side of the connecting seat is connected to the swing frame by bolts. The opposite sides of the swing frame are rotatably connected to the swing plate by bearings.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention provides a fixing mechanism. When drilling a hole in the engine cylinder head, the engine cylinder head is placed on the support plate. At this time, the turning handle is turned, which drives the double-headed screw to rotate, and the two push blocks drive the two push rods to move under the action of the double-headed screw. Since the two push rods are arranged in an X shape, the push rods will close when they move. At this time, the support plate will move upward under the action of the lifting assembly. At the same time, the two fixed clamping plates will move towards each other under the action of the two push rods. When moving, the fixed clamping plates will clamp and fix the two sides of the engine cylinder head, thereby improving the stability of the drilling of the engine cylinder head, improving the drilling effect of the engine cylinder head, and preventing the engine cylinder head from shifting due to vibration during drilling, thereby causing deviation in the drilling of the engine cylinder head;

[0017] When the cam is in a state of being rotated, the two ends of the cam are moved in a reverse direction so that the two ends of the cam can be moved in a reverse direction so that the cam can move relative to the other end of the cam and move relative to the other end of the cam. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an angle-adjustable drilling device for an engine cylinder head proposed by the present invention;

[0019] Figure 2 This is a schematic diagram of the drilling mechanism structure of an angle-adjustable drilling device for an engine cylinder head proposed by the present invention;

[0020] Figure 3 This is a schematic structural diagram of a fixing mechanism of an angle-adjustable drilling device for an engine cylinder head proposed by the present invention;

[0021] Figure 4 This is a schematic diagram of the main structure of the fixing mechanism of the angle-adjustable drilling device for an engine cylinder head proposed by the present invention;

[0022] Figure 5 This is a schematic structural diagram of a lifting assembly of an angle-adjustable engine cylinder head drilling device proposed by the present invention;

[0023] Figure 6 This is a schematic diagram of the reinforcement structure of an angle-adjustable drilling device for an engine cylinder head proposed by the present invention;

[0024] Figure 7 This is a schematic diagram of the partial structure of an angle-adjustable drilling device for an engine cylinder head proposed by the present invention.

[0025] In the accompanying drawings: 1. operating table; 2. moving mechanism; 3. support pad; 4. lifting mechanism; 5. drilling mechanism; 6. fixing mechanism; 7. moving seat; 8. moving slot; 9. lead screw; 10. first motor; 11. moving block; 12. lifting seat; 13. lifting port; 14. positioning port; 15. positioning block; 16. first hydraulic cylinder; 17. lifting block; 18. second hydraulic cylinder; 19. support plate; 20. second motor; 21. third motor; 22. fixing plate; 23. drill rod; 24. side plate; 25. Support plate; 26. Slide groove; 27. Fixed splint; 28. Guide port; 29. ​​Guide block; 30. Lifting assembly; 31. Guide rail; 32. Guide plate; 33. Connecting port; 34. Double-headed screw; 35. Push block; 36. Turn handle; 37. Push rod; 38. Push block; 39. Reinforcement mechanism; 40. Push plate; 41. Connecting seat; 42. Reinforcement plate; 43. Damper; 44. First spring; 45. Swing frame; 46. Swing plate; 47. Slide plate; 48. Push rod; 49. Second spring. DETAILED DESCRIPTION

[0026] Example 1, with reference to Figure 1-Figure 5 A drilling device for an engine cylinder head with adjustable angle includes an operating platform 1, a moving mechanism 2 is provided on one side of the top of the operating platform 1, and a support pad 3 is provided on the top of the moving mechanism 2, a lifting mechanism 4 is provided on the top of the support pad 3, and a second hydraulic cylinder 18 is provided on one side of the lifting mechanism 4, one end of the second hydraulic cylinder 18 is connected to a support plate 19 by bolts, one side of the support plate 19 is connected to a second motor 20 by bolts, and a drilling mechanism 5 is provided on one end of the second motor 20, and a fixing mechanism 6 is connected to one side of the top of the operating platform 1 by bolts, and the fixing mechanism 6 is located directly below the drilling mechanism 5, so as to improve the stability of the engine cylinder head drilling, improve the drilling effect of the engine cylinder head, and prevent the engine cylinder head from being offset due to vibration during drilling, thereby causing deviation in the drilling of the engine cylinder head.

[0027] On the basis of the above, the moving mechanism 2 includes a moving seat 7, a screw 9, a first motor 10 and a moving block 11, and the bottom of the moving seat 7 is connected to the top of the operating table 1 by bolts, and a moving groove 8 is provided on the top of the moving seat 7. The opposite sides of the moving groove 8 are rotated with the screw 9 through bearings. One side of the moving seat 7 is connected to the first motor 10 by bolts, one end of the first motor 10 is fixedly connected to the screw 9, and the moving block 11 is slidably connected to the inner wall of the moving groove 8. A threaded hole is provided on one side of the moving block 11, and the threaded hole is threadedly connected to the screw 9. The top of the moving block 11 is connected to the bottom of the support pad 3 by bolts.

[0028] On the basis of the above, the lifting mechanism 4 includes a lifting seat 12, a lifting block 17 and a first hydraulic cylinder 16, and the bottom of the lifting seat 12 is connected to the top of the support pad 3 by bolts. A lifting port 13 is provided on one side of the lifting seat 12 near the top, and the inner wall of the lifting port 13 is slidably connected to the lifting block 17. One side of the lifting block 17 is fixedly connected to one end of the second hydraulic cylinder 18. A mounting port is provided on the top of the lifting port 13, and the mounting port is fixedly connected to the first hydraulic cylinder 16. The bottom of the first hydraulic cylinder 16 is fixedly connected to the top of the lifting block 17. Positioning ports 14 are provided on both opposite sides of the lifting port 13, and the inner walls of the two positioning ports 14 are slidably connected with positioning blocks 15. The positioning block 15 and the lifting block 17 are connected by bolts.

[0029] On the basis of the above, the drilling mechanism 5 includes a third motor 21, a fixed plate 22 and a drill rod 23, and one end of the fixed plate 22 is fixedly connected to one end of the second motor 20, and a rotational connection is formed between the bottom of the fixed plate 22 and the drill rod 23 through a bearing, and the third motor 21 is connected to the top of the fixed plate 22 by bolts, and one end of the third motor 21 is fixedly connected to the top of the drill rod 23.

[0030] On the basis of the above, the fixing mechanism 6 includes two side panels 24, a fixing assembly and a lifting assembly 30, and the bottom of the two side panels 24 is connected to the top of the operating platform 1 by bolts. The fixing assembly consists of a support plate 25 and two fixed clamps 27. Slide grooves 26 are provided on both sides of the top of the support plate 25. The inner walls of the two slide grooves 26 are slidably connected with a top block 38. The top of the top block 38 is connected to the bottom of the fixed clamp 27 by bolts. A guide opening 28 is provided on one side of the two side panels 24. The inner wall of the guide opening 28 is slidably connected with a guide block 29. One side of the guide block 29 is connected to the support plate 25 by bolts. The operating platform 1 and the fixing assembly are connected by the lifting assembly 30.

[0031] On the basis of the above, the lifting assembly 30 is composed of two guide rails 31, a double-headed screw 34 and a plurality of push rods 37, and the two guide rails 31 are connected to the operating table 1 by bolts. The two guide rails 31 are symmetrically distributed on both sides of the double-headed screw 34. Guide plates 32 are slidably connected to both sides of the inner wall of the guide rail 31. The tops of the two guide plates 32 are connected to the bottoms of the two push rods 37 by hinges. The two push rods 37 are distributed in an X shape. The two push rods 37 are rotatably connected by bearings. A sliding mouth is provided at the bottom of the slide 26, and the sliding mouth slides with the push rod 37. Dynamic connection, the top of the push rod 37 is connected to the push block 38 by a hinge, and the two ends of the double-headed screw 34 are rotatably connected to the two side plates 24 through bearings. The threads on both sides of the double-headed screw 34 are in opposite directions, and a turning handle 36 is welded to one end of the double-headed screw 34. A connecting port 33 is penetrated on the opposite side of the two guide rails 31, and the inner walls of the two connecting ports 33 are slidably connected to push blocks 35. A threaded port is penetrated on one side of the push block 35, and the threaded port is threadedly connected to the double-headed screw 34. One end of the push block 35 is fixedly connected to the guide plate 32.

[0032] Example 2, reference Figure 1-Figure 7 , an angle-adjustable drilling device for an engine cylinder head. Compared with Example 1, on the basis of Example 1, a reinforcement mechanism 39 is provided on one side of the fixed splint 27, and the reinforcement mechanism 39 is matched with the fixing mechanism 6.

[0033] On the basis of the above, the reinforcement mechanism 39 includes a push plate 40, two connecting seats 41 and two reinforcement plates 42, and the push plate 40 and the reinforcement plate 42 are connected by a transmission member, one side of the two connecting seats 41 is connected to the fixed clamping plate 27 by bolts, and a damper 43 is connected between one side of the connecting seat 41 and the reinforcement plate 42 by bolts, and the outer wall of the damper 43 is sleeved with a first spring 44, and anti-slip grooves are provided on one side of the push plate 40 and one side of the reinforcement plate 42.

[0034] On the basis of the above, the transmission parts are composed of two slides 47, two push rods 48, two swing frames 45 and two swing plates 46. A slot is provided on one side of the fixed splint 27. The two slides 47 are slidably connected on both sides of the inner wall of the slot. The two ends of the push rod 48 are connected to one side of the push plate 40 and the slide 47 by a hinge. The two push rods 48 are distributed in an eight-shaped shape. A second spring 49 is bolted between the two slides 47. One side of the connecting seat 41 is connected to the swing frame 45 by bolts. The opposite sides of the swing frame 45 are connected to the swing plate 46 through bearings to form a rotational connection. Through the cooperation between the fixing mechanism 6 and the reinforcement mechanism 39, the engine cylinder head can be effectively fixed, the drilling effect of the engine cylinder head can be improved, and the deviation of the engine cylinder head during drilling due to poor fixing effect of the engine cylinder head can be prevented.

[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An angle-adjustable drilling device for an engine cylinder head, comprising an operating table (1), characterized in that: A moving mechanism (2) is provided on one side of the top of the operating platform (1), and a support pad (3) is provided on the top of the moving mechanism (2), a lifting mechanism (4) is provided on the top of the support pad (3), and a second hydraulic cylinder (18) is provided on one side of the lifting mechanism (4), one end of the second hydraulic cylinder (18) is connected to a support plate (19) by bolts, one side of the support plate (19) is connected to a second motor (20) by bolts, and a drilling mechanism (5) is provided on one end of the second motor (20), and a fixing mechanism (6) is connected to one side of the top of the operating platform (1) by bolts, and the fixing mechanism (6) is located directly below the drilling mechanism (5).

2. The angle-adjustable drilling device for an engine cylinder head according to claim 1, characterized in that: The moving mechanism (2) comprises a moving seat (7), a lead screw (9), a first motor (10) and a moving block (11), wherein the bottom of the moving seat (7) is connected to the top of the operating table (1) by bolts, a moving groove (8) is provided on the top of the moving seat (7), and two opposite sides of the moving groove (8) are rotatably connected to the lead screw (9) through bearings, one side of the moving seat (7) is connected to the first motor (10) by bolts, one end of the first motor (10) is fixedly connected to the lead screw (9), the moving block (11) is slidably connected to the inner wall of the moving groove (8), a threaded hole is provided through one side of the moving block (11), the threaded hole is threadedly connected to the lead screw (9), and the top of the moving block (11) is connected to the bottom of the support pad (3) by bolts.

3. The angle-adjustable drilling device for an engine cylinder head according to claim 2, characterized in that: The lifting mechanism (4) comprises a lifting seat (12), a lifting block (17) and a first hydraulic cylinder (16), and the bottom of the lifting seat (12) is connected to the top of the support pad (3) by bolts, a lifting port (13) is provided through one side of the lifting seat (12) near the top, the inner wall of the lifting port (13) is slidably connected to the lifting block (17), one side of the lifting block (17) is fixedly connected to one end of the second hydraulic cylinder (18), a mounting port is provided through the top of the lifting port (13), the mounting port is fixedly connected to the first hydraulic cylinder (16), the bottom of the first hydraulic cylinder (16) is fixedly connected to the top of the lifting block (17), positioning ports (14) are provided through opposite sides of the lifting port (13), the inner walls of the two positioning ports (14) are slidably connected to positioning blocks (15), and the positioning blocks (15) and the lifting block (17) are connected by bolts.

4. The angle-adjustable drilling device for an engine cylinder head according to claim 1, characterized in that: The drilling mechanism (5) comprises a third motor (21), a fixed disk (22) and a drill rod (23), wherein one end of the fixed disk (22) is fixedly connected to one end of the second motor (20), a bottom of the fixed disk (22) and the drill rod (23) are rotatably connected via a bearing, the third motor (21) and the top of the fixed disk (22) are connected via bolts, and one end of the third motor (21) is fixedly connected to the top of the drill rod (23).

5. The angle-adjustable drilling device for an engine cylinder head according to claim 1, characterized in that: The fixing mechanism (6) includes two side plates (24), a fixing assembly and a lifting assembly (30), and the bottoms of the two side plates (24) are connected to the top of the operating table (1) by bolts. The fixing assembly consists of a support plate (25) and two fixed clamping plates (27). Both sides of the top of the support plate (25) are provided with a slide groove (26), the inner walls of the two slide grooves (26) are slidably connected with a top block (38), the top of the top block (38) is connected to the bottom of the fixed clamping plate (27) by bolts, one side of the two side plates (24) is provided with a guide opening (28), the inner wall of the guide opening (28) is slidably connected with a guide block (29), one side of the guide block (29) is connected to the support plate (25) by bolts, and the operating table (1) and the fixing assembly are connected by the lifting assembly (30).

6. The angle-adjustable drilling device for an engine cylinder head according to claim 5, characterized in that: The lifting assembly (30) is composed of two guide rails (31), a double-headed screw (34) and a plurality of push rods (37), and the two guide rails (31) are connected to the operating table (1) by bolts. The two guide rails (31) are symmetrically distributed on both sides of the double-headed screw (34). Both sides of the inner wall of the guide rail (31) are slidably connected with guide plates (32). The tops of the two guide plates (32) and the bottoms of the two push rods (37) are connected by hinges. The two push rods (37) are distributed in an X shape. The two push rods (37) are rotatably connected by bearings. The bottom of the slide groove (26) is provided with a sliding mouth, and the sliding mouth is slidably connected to the push rod (37). The top of the push rod (37) is connected to the top block (38) by a hinge, and the two ends of the double-headed screw (34) are rotatably connected to the two side plates (24) through bearings. The threads on both sides of the double-headed screw (34) are in opposite directions. One end of the double-headed screw (34) is welded with a turning handle (36). The two guide rails (31) are provided with a connecting port (33) on the opposite side. The inner walls of the two connecting ports (33) are slidably connected with a push block (35). One side of the push block (35) is provided with a threaded port, which is threadedly connected to the double-headed screw (34). One end of the push block (35) is fixedly connected to the guide plate (32).

7. The angle-adjustable drilling device for an engine cylinder head according to claim 6, characterized in that: A reinforcement mechanism (39) is provided on one side of the fixed splint (27), and the reinforcement mechanism (39) is matched with the fixing mechanism (6).

8. The angle-adjustable drilling device for an engine cylinder head according to claim 7, characterized in that: The reinforcing mechanism (39) includes a push plate (40), two connecting seats (41) and two reinforcing plates (42), and the push plate (40) and the reinforcing plates (42) are connected by a transmission member, one side of the two connecting seats (41) and the fixed clamping plate (27) are connected by bolts, a damper (43) is connected between one side of the connecting seat (41) and the reinforcing plate (42) by bolts, and the outer wall of the damper (43) is sleeved with a first spring (44), and one side of the push plate (40) and one side of the reinforcing plate (42) are both provided with anti-slip grooves.

9. The angle-adjustable drilling device for an engine cylinder head according to claim 8, characterized in that: The transmission member is composed of two slides (47), two push rods (48), two swing frames (45) and two swing plates (46). A notch is provided on one side of the fixed splint (27). The two slides (47) are slidably connected to the two sides of the inner wall of the notch. The two ends of the push rod (48) are connected to one side of the push plate (40) and the slide (47) through a hinge. The two push rods (48) are distributed in an eight-shaped pattern. A second spring (49) is connected between the two slides (47) by bolts. One side of the connecting seat (41) is connected to the swing frame (45) by bolts. The opposite sides of the swing frame (45) and the swing plate (46) are rotatably connected by bearings.

Citation Information

Patent Citations

  • Angle-adjustable drilling device for engine cylinder cover

    CN221289589U