Engine valve clearance adjusting device and method

Abstract

The invention discloses an engine valve clearance adjusting device and method, and belongs to the field of valve clearance adjusting.The engine valve clearance adjusting device comprises a fixing block, a rotating shaft, a corner character disc arranged on the periphery of the upper portion of the rotating shaft and a pointer arranged at the upper end of the rotating shaft through a fixing cap; one end of the pointer is fixed on a fixed block, the other side of the fixed block is provided with a flexible shaft capable of driving the pointer to rotate, and the end part of the flexible shaft is provided with a magnet; the lower part of the rotating shaft penetrates out of the corner character disc; the rotating shaft is driven to rotate by rotating the corner character disc with a hand, meanwhile, the pointer is kept still, and the rotating angle of the corner character disc is accurately controlled according to the angle pointed by the pointer. In the maintenance process of the engine, when the valve clearance of the engine needs to be adjusted, the valve clearance of the engine can be rapidly and accurately adjusted, the experience of operators is not needed, and repeated measurement is not needed.

Description

Technical Field

[0001] The invention relates to the technical field of engines, and in particular to an engine valve clearance adjustment device and method. Background Art

[0002] When the engine is working, the valve will expand due to the increase in temperature. If there is no gap or the gap is too small between the valve and its transmission parts in the cold state, the thermal expansion of the valve and its transmission parts in the hot state will cause the valve to not close tightly, causing the engine to leak during the compression stroke and the working stroke, thereby reducing power. In severe cases, the engine cannot start, and the valve may even hit the piston. If the gap between the valve and its transmission parts in the cold state is too large, it will cause power reduction, increase the impact of the valve mechanism parts, and accelerate wear. In order to eliminate this phenomenon, a certain gap is usually left in the valve and its transmission parts when the engine is assembled in the cold state to compensate for the expansion of the valve after heating.

[0003] After the engine has been running for a period of time, the friction between the valves and their transmission parts will cause the valve clearance to increase. Therefore, the valve clearance of the engine needs to be checked after the engine has been running for a certain period of time, and adjusted if necessary to keep the engine in good performance and improve its reliability.

[0004] Currently, most methods for adjusting engine valve clearance are to use a feeler gauge. Adjustment with a feeler gauge not only has low adjustment accuracy, but also relies on the operator's experience and requires multiple measurements.

[0005] Therefore, it is necessary to develop an engine valve clearance adjustment device and method to overcome the above problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an engine valve clearance adjustment device and method. During engine maintenance, when the engine valve clearance needs to be adjusted, the engine valve clearance can be adjusted quickly and accurately without relying on the operator's experience or requiring multiple measurements.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] An engine valve clearance adjustment device comprises a fixed block, a rotating shaft, an angle dial arranged on the outer periphery of the upper part of the rotating shaft, and a pointer arranged on the upper end of the rotating shaft through a fixed cap; one end of the pointer is fixed on the fixed block, a flexible shaft capable of driving the pointer to rotate is arranged on the other side of the fixed block, and a magnet is arranged at the end of the flexible shaft; the lower part of the rotating shaft passes through the angle dial; the rotating shaft is driven to rotate by rotating the angle dial by hand, while the pointer remains stationary, and the rotation angle of the angle dial is accurately controlled according to the angle indicated by the pointer.

[0009] A further improvement of the technical solution of the present invention is that one end of the pointer is fixed to the fixing block by a first bolt.

[0010] A further improvement of the technical solution of the present invention is that: the fixing cap is fixed to the rotating shaft by a second bolt, a gap is provided between the pointer and the fixing cap; and the second bolt has a limiting and supporting effect on the pointer.

[0011] A further improvement of the technical solution of the present invention is that the rotating shaft and the rotating angle dial are interference fit.

[0012] A further improvement of the technical solution of the present invention is that: a plurality of grooves are arranged on the outer side of the angle dial for convenient manual rotation of the angle dial, and a scale is arranged on the top of the angle dial; the scale matches the pointer.

[0013] A method for adjusting engine valve clearance comprises the following steps:

[0014] Step 1: Before adjusting the engine valve clearance, let the engine cool for at least 30 minutes, then rotate the crankshaft until valve overlap is achieved, that is, the exhaust valve has not yet closed and the intake valve begins to open;

[0015] Step 2, rotating the flexible shaft to adjust the pointer so that the pointer returns to zero;

[0016] Step 3: Adsorb the magnet near the valve to be adjusted, select the socket wrench assembly corresponding to the valve clearance adjustment bolt and install it on the bottom end of the rotating shaft; place the bottom end of the selected socket wrench assembly on the valve clearance adjustment bolt;

[0017] Step 4, then turn the angle dial clockwise to the bottom, that is, turn it until there is no gap between the exhaust valve clearance and the intake valve clearance;

[0018] Step 5, rotating the angle dial in a counterclockwise direction until the preset rotation angle of the exhaust valve clearance or the intake valve clearance is reached;

[0019] Step 6. Finally, tighten the loosening nut to the specified torque.

[0020] A further improvement of the technical solution of the present invention is that in step 3, the valve clearance adjustment bolt is any one of a straight shape, a cross shape, a rectangle, a circle, a hexagon, and a plum blossom shape.

[0021] A further improvement of the technical solution of the present invention is that in step 5, the valve clearance adjustment bolts of different engines are different, and the rotation angle needs to be determined according to the pitch of the valve clearance adjustment bolts.

[0022] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0023] 1. The present invention sets a pointer at the upper end of the rotating shaft, sets an angle dial on the upper periphery of the rotating shaft, and rotates the angle dial by hand to drive the rotating shaft to rotate, while the pointer remains stationary, and the rotation angle of the angle dial is accurately controlled according to the angle pointed by the pointer; the device has a simple structure.

[0024] 2. The present invention places the engine valve clearance adjustment device on the valve clearance adjustment bolt through the socket wrench assembly, and rotates the angle dial by hand to drive the shaft to rotate, while the pointer remains stationary. According to the angle indicated by the pointer, the rotation angle of the angle dial is accurately controlled, so that the engine valve clearance adjustment needs to reach a preset rotation angle, the adjustment time is shorter, and repeated measurements are not required; and it is easy to operate and does not require experience judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a cross-sectional view of the structure of an engine valve clearance adjustment device provided in an embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of an engine valve clearance adjustment device provided in an embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of adjusting the exhaust valve by the engine valve clearance adjustment device provided in an embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of adjusting an intake valve by an engine valve clearance adjustment device provided in an embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of engine cylinder numbering provided in an embodiment of the present invention;

[0031] Among them, 1. magnet; 2. flexible shaft; 3. first bolt; 4. pointer; 5. second bolt; 6. fixing cap; 7. rotating shaft; 8. angle dial; 8-1, groove; 8-2, dial; 9. loosening nut; 10. valve clearance adjustment bolt; 11. socket wrench assembly; 12. exhaust valve clearance; 13. intake valve clearance; 14. flywheel. DETAILED DESCRIPTION

[0032] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0036] like Figure 1 , 2 As shown, an engine valve clearance adjustment device comprises a fixed block, a rotating shaft 7, an angle dial 8 arranged on the outer periphery of the upper part of the rotating shaft 7, and a pointer 4 arranged on the upper end of the rotating shaft 7 through a fixed cap 6; one end of the pointer 4 is fixed on the fixed block, and a flexible shaft 2 (used for returning the pointer 4 to zero) capable of driving the pointer 4 to rotate is arranged on the other side of the fixed block, and a magnet 1 is arranged at the end of the flexible shaft 2; the lower part of the rotating shaft 7 passes through the angle dial 8; the angle dial 8 is rotated by hand to drive the rotating shaft 7 to rotate, while the pointer 4 remains stationary, and the rotation angle of the angle dial 8 is accurately controlled according to the angle indicated by the pointer 4.

[0037] Furthermore, one end of the pointer 4 is fixed to the fixing block by a first bolt 3 .

[0038] Furthermore, the fixing cap 6 is fixed to the rotating shaft 7 by the second bolt 5 , and a gap is provided between the pointer 4 and the fixing cap 6 ; the second bolt 5 has a limiting and supporting effect on the pointer 4 .

[0039] Furthermore, the rotating shaft 7 and the angle dial 8 are interference fit.

[0040] Furthermore, the outer side of the angle dial 8 is provided with a plurality of grooves 8-1 for conveniently rotating the angle dial 8 by hand, and a scale plate 8-2 is provided at the top of the angle dial 8; the scale plate 8-2 matches the pointer 4. The grooves 8-1 can be set to 2, 3 or 4, and the specific number can be set according to actual conditions, and the main function is to facilitate the rotation of the angle dial 8 by hand.

[0041] A method for adjusting engine valve clearance, such as Figure 3 , 4 As shown, the following steps are included:

[0042] Step 1: Before adjusting the engine valve clearance, let the engine cool for at least 30 minutes, then rotate the crankshaft until the valve overlap is reached, that is, the exhaust valve is not closed yet, and the intake valve begins to open to the working top dead center;

[0043] Step 2, rotate the flexible shaft 2 to adjust the pointer 4 so that the pointer 4 returns to zero;

[0044] Step 3, adsorb the magnet 1 near the valve part that needs to be adjusted, select the socket wrench assembly 11 corresponding to the valve clearance adjustment bolt 10, install the upper end of the selected socket wrench assembly 11 to the bottom end of the rotating shaft 7, and place the bottom end of the selected socket wrench assembly 11 on the valve clearance adjustment bolt 10; the valve clearance adjustment bolt 10 is any one of a straight line, a cross, a rectangle, a circle, a hexagon, a plum blossom, etc.

[0045] Step 4, then rotate the angle dial 8 clockwise to the bottom, that is, until there is no gap between the exhaust valve clearance 12 or the intake valve clearance 13;

[0046] Step 5, rotate the angle dial 8 in a counterclockwise direction until the preset rotation angle of the exhaust valve clearance 12 or the intake valve clearance 13 is reached; the valve clearance adjustment bolts 10 of different engines are different, and the rotation angle needs to be determined based on the pitch of the valve clearance adjustment bolts 10.

[0047] Step 6, finally tighten the loosening nut 9 according to the specified torque.

[0048] Example:

[0049] Taking a V-shaped 90° angle, 6-cylinder, 4-valve engine as an example (2 intake valves + 2 exhaust valves), the rotation angle is shown in Table 1 below:

[0050] Table 1 Engine valve clearance transfer angle table

[0051]

[0052] The cylinder numbers of a V-shaped 90° angle, 6-cylinder, four-valve engine are as follows: Figure 5 As shown, the operator determines the valve clearance adjustment sequence from the hand wheel 14 panel; the valve clearance adjustment sequence is shown in Table 2 below:

[0053] Table 2 Valve clearance adjustment sequence

[0054] Valve overlap Adjustment A1 B2 B3 A2 A3 B1 B2 A1 A2 B3 B1 A3

[0055] In summary, the engine valve clearance adjustment device provided by the present invention has a simple structure, an easy-to-operate adjustment method, does not require experience and judgment, takes a shorter adjustment time, and does not require repeated measurements.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An engine valve clearance adjustment device, characterized in that: The invention comprises a fixed block, a rotating shaft (7), an angle dial (8) arranged on the outer periphery of the upper part of the rotating shaft (7), and a pointer (4) arranged on the upper end of the rotating shaft (7) through a fixed cap (6); one end of the pointer (4) is fixed on the fixed block, a flexible shaft (2) capable of driving the pointer (4) to rotate is arranged on the other side of the fixed block, and a magnet (1) is arranged at the end of the flexible shaft (2); the lower part of the rotating shaft (7) passes through the angle dial (8); the rotating shaft (7) is driven to rotate by rotating the angle dial (8) by hand, while the pointer (4) remains stationary, and the rotation angle of the angle dial (8) is accurately controlled according to the angle indicated by the pointer (4).

2. The engine valve clearance adjustment device according to claim 1, characterized in that: One end of the pointer (4) is fixed to the fixing block via a first bolt (3).

3. The engine valve clearance adjustment device according to claim 1, characterized in that: The fixing cap (6) is fixed to the rotating shaft (7) by means of a second bolt (5), and a gap is provided between the pointer (4) and the fixing cap (6); the second bolt (5) has a limiting and supporting effect on the pointer (4).

4. The engine valve clearance adjustment device according to claim 1, characterized in that: The rotating shaft (7) and the rotating angle dial (8) are interference fit.

5. The engine valve clearance adjustment device according to claim 1, characterized in that: The outer side of the angle dial (8) is provided with a plurality of grooves (8-1) for facilitating manual rotation of the angle dial (8), and the top of the angle dial (8) is provided with a scale plate (8-2); the scale plate (8-2) matches the pointer (4).

6. A method for adjusting engine valve clearance, using an engine valve clearance adjusting device as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Before adjusting the engine valve clearance, let the engine cool for at least 30 minutes, then rotate the crankshaft until valve overlap is achieved, that is, the exhaust valve has not yet closed and the intake valve begins to open; Step 2, rotating the flexible shaft (2) to adjust the pointer (4) so ​​that the pointer (4) returns to zero; Step 3: Adsorb the magnet (1) near the valve to be adjusted, select a socket wrench assembly (11) corresponding to the valve clearance adjustment bolt (10) and install it on the bottom end of the rotating shaft (7); place the bottom end of the selected socket wrench assembly (11) on the valve clearance adjustment bolt (10); Step 4, then rotate the angle dial (8) clockwise to the bottom, that is, until the exhaust valve clearance (12) or the intake valve clearance (13) has no clearance; Step 5, rotating the angle dial (8) in a counterclockwise direction until the preset rotation angle of the exhaust valve clearance (12) or the intake valve clearance (13) is reached; Step 6, finally tighten the loose nut (9) according to the specified torque.

7. The method for adjusting engine valve clearance according to claim 6, characterized in that: In step 3, the valve clearance adjustment bolt (10) is any one of a straight shape, a cross shape, a rectangle, a circle, a hexagon, and a plum blossom shape.

8. The method for adjusting engine valve clearance according to claim 6, characterized in that: In step 5, the valve clearance adjusting bolts (10) of different engines are different, and the rotation angle needs to be determined according to the pitch of the valve clearance adjusting bolts (10).

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