Rotary valve mechanism of diesel engine

Abstract

The utility model discloses a rotary valve mechanism of a diesel engine, which is mounted on a cylinder cover and comprises a valve, a rotary valve mechanism, a valve guide pipe, a valve spring and a valve seat ring, and the valve guide pipe and the valve seat ring which are coaxially arranged are fixedly mounted on the cylinder cover. A rod portion of the valve sequentially penetrates through the valve seat ring, the cylinder cover and the valve guide pipe from bottom to top, the valve rotating mechanism and the valve spring are sleeved on the rod portion of the valve, the valve guide pipe comprises an installation blocking table, an upper guide pipe portion and a lower guide pipe portion, and the lower guide pipe portion is fixedly installed in a valve guide pipe installation hole of the cylinder cover. The lower end face of the installation blocking table is attached to the upper end face of the valve guide pipe installation hole, the valve guide pipe is sleeved with a spring installation base, a gap is formed between the bottom end face of the spring installation base and the upper end face of the valve guide pipe installation hole, and the valve spring is located between the rotary valve mechanism and the spring installation base. According to the rotary valve mechanism of the diesel engine, abrasion of the valve spring to the cylinder cover is avoided, and the service life of the cylinder cover is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of a diesel engine valve distribution device, in particular to a rotary valve mechanism of a diesel engine. Background Art

[0002] The rotary valve mechanism (sometimes called valve rotation mechanism) is an important part used in the intake and exhaust mechanism of marine or power generation diesel engines. Its function is to force the valve to rotate around its own axis during the valve opening and closing process, so that the valve, valve seat ring, and valve guide are evenly worn and grinded against each other, eliminating carbon deposits between them and preventing "leakage" and "stuck". In addition, the rotary valve mechanism can also make the valve evenly heated and dissipated, extending the valve life by more than 3 times.

[0003] During each valve opening and closing process, the rotary valve mechanism drives the valve to slowly rotate a certain angle. However, when the rotary valve mechanism just begins to press down or ends its rebound, the valve spring preload is relatively small and the torque resisting the rotary valve mechanism's rotation is insufficient. The rotary valve mechanism will drive the valve spring to rotate slightly, causing certain wear on the cylinder head and reducing the life of the cylinder head.

[0004] In order to solve the problem of wear of the cylinder head caused by the rotation of the valve spring and extend the life of the cylinder head, it is necessary to optimize the rotary valve mechanism of the diesel engine. Utility Model Content

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a rotary valve mechanism of a diesel engine, which can avoid the wear of the valve spring on the cylinder head and extend the life of the cylinder head.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A rotary valve mechanism of a diesel engine, the rotary valve mechanism is installed on a cylinder head, the rotary valve mechanism comprises a valve, a rotary valve mechanism, a valve guide, a valve spring and a valve seat ring, the valve guide and the valve seat ring are coaxially arranged and fixedly installed on the cylinder head, the stem of the valve passes through the valve seat ring, the cylinder head and the valve guide in sequence from bottom to top, the rotary valve mechanism and the valve spring are sleeved on the stem of the valve, and the characteristics are:

[0008] The valve guide comprises a mounting stop, an upper guide portion and a lower guide portion respectively located at the upper and lower sides of the mounting stop, a valve guide mounting hole is opened on the cylinder head, the lower guide portion is fixedly mounted in the valve guide mounting hole, and the lower end surface of the mounting stop is in contact with the upper end surface of the valve guide mounting hole.

[0009] A spring mounting base is sleeved on the valve guide, a gap is provided between the bottom end surface of the spring mounting base and the upper end surface of the valve guide mounting hole, and the valve spring is located between the rotary valve mechanism and the spring mounting base.

[0010] Preferably, the spring mounting base is fixedly mounted on the upper conduit portion of the valve conduit and the mounting stop.

[0011] Preferably, there is a gap T1 between the bottom end surface of the spring mounting base and the upper end surface of the valve guide mounting hole, and 1.5 mm ≤ T1 ≤ 2 mm.

[0012] Preferably: the spring mounting base includes a chassis portion and a barrel portion protruding from an upper end surface of the chassis portion, the spring mounting base is provided with a stepped hole, and the stepped hole includes a lower hole opened in the chassis portion and an upper hole opened in the barrel portion.

[0013] Preferably, there is a gap A between the inner hole wall of the upper hole and the outer circular wall surface of the upper conduit portion, and 0.2mm≤A≤0.4mm.

[0014] Preferably, an oil unloading hole perpendicular to the axis of the valve is provided on the cylinder head, and a distance T2 is provided between the step surface of the step hole and the hole wall of the oil unloading hole, and 1.5 mm ≤ T2 ≤ 2.5 mm.

[0015] Preferably, there is a gap T3 between the inner hole wall of the lower hole and the outer cylindrical surface of the mounting stop, and 0.8 mm ≤ T3 ≤ 1 mm.

[0016] Preferably, the lower conduit portion of the valve conduit is interference-fitted with the valve conduit mounting hole.

[0017] Preferably, the interference between the lower guide tube portion and the valve guide tube mounting hole is assumed to be L, and 0.001 mm≤L≤0.033 mm.

[0018] Preferably, a sealing ring is provided between the stem of the valve and the inner wall of the valve guide tube.

[0019] After adopting the above technical solution, the beneficial effects of the utility model are:

[0020] The rotary valve mechanism of a diesel engine of the utility model is installed on a cylinder head, the rotary valve mechanism comprises a valve, a rotary valve mechanism, a valve guide, a valve spring and a valve seat ring, the cylinder head is fixedly mounted with a valve guide and a valve seat ring arranged coaxially, the stem of the valve passes through the valve seat ring, the cylinder head and the valve guide in sequence from bottom to top, the rotary valve mechanism and the valve spring are sleeved on the stem of the valve, the valve guide comprises a mounting stopper, an upper guide tube part and a lower guide tube part respectively located at the upper and lower sides of the mounting stopper, a valve guide mounting hole is opened on the cylinder head, the lower guide tube part is fixedly mounted in the valve guide mounting hole, a spring mounting base is sleeved on the valve guide, a gap is provided between the bottom end surface of the spring mounting base and the upper end surface of the valve guide mounting hole, and the valve spring is located between the rotary valve mechanism and the spring mounting base.

[0021] The rotary valve mechanism of the diesel engine of the utility model is designed with a spring mounting base, which is directly mounted on the wear-resistant valve guide. There is a gap between the bottom end surface of the spring mounting base and the upper end surface of the valve guide mounting hole, so that the valve spring contacts the spring mounting base, while the valve spring does not directly contact the cylinder head, thereby avoiding the wear of the valve spring on the cylinder head and extending the life of the cylinder head. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a rotary valve mechanism of a diesel engine of the utility model;

[0023] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the structure;

[0024] In the figure:

[0025] 1. Cylinder head; 101. Valve guide mounting hole; 102. Oil unloading hole; 2. Valve guide; 201. Mounting stopper; 202. Upper guide tube part; 203. Lower guide tube part; 3. Valve seat ring; 4. Valve; 5. Rotary valve mechanism; 6. Valve spring; 7. Spring mounting base; 701. Chassis part; 702. Cylinder body part; 8. Sealing ring. DETAILED DESCRIPTION

[0026] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the utility model, but it is not intended to limit the scope of protection of the claims attached to the utility model.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] In addition, although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0029] The utility model discloses some embodiments, such as Figure 1 The rotary valve mechanism of the diesel engine shown in the figure is installed on the cylinder head 1, and the rotary valve mechanism includes a valve 4, a rotary valve mechanism 5, a valve guide 2, a valve spring 6 and a valve seat ring 3. The valve guide 2 and the valve seat ring 3 arranged coaxially are fixedly installed on the cylinder head 1. The stem of the valve 4 passes through the valve seat ring 3, the cylinder head 1 and the valve guide 2 in sequence from bottom to top. The rotary valve mechanism 5 and the valve spring 6 are sleeved on the stem of the valve 4. The valve guide 2 includes a mounting block 201, an upper guide tube part 202 and a lower guide tube part 203 respectively located on the upper and lower sides of the mounting block. A valve guide mounting hole 101 is opened on the cylinder head 1, and the lower guide tube part 203 is fixedly installed in the valve guide mounting hole 101. The lower end surface of the mounting block 201 is in contact with the upper end surface of the valve guide mounting hole 101.

[0030] A spring mounting base 7 is mounted on the valve guide 2 . There is a gap between the bottom end surface of the spring mounting base 7 and the upper end surface of the valve guide mounting hole 101 . The valve spring 6 is located between the rotary valve mechanism 5 and the spring mounting base 7 .

[0031] In some embodiments, the spring mounting base 7 is fixedly mounted on the upper guide tube portion 202 of the valve guide tube 2 and the mounting stop 201 .

[0032] In some embodiments, Figure 2As shown, the gap between the bottom end surface of the spring mounting base 7 and the upper end surface of the valve guide mounting hole 101 is T1, 1.5mm≤T1≤2mm. The gap T1 ensures that the spring mounting base 7 will not contact and wear the cylinder head 1. Even if it is used for a long time until it is scrapped, the gap T1 can also ensure that the cylinder head 1 is not worn.

[0033] In some embodiments, the spring mounting base 7 includes a chassis portion 701 and a barrel portion 702 protruding from the upper end surface of the chassis portion 701. The spring mounting base 7 is provided with a stepped hole, which includes a lower hole provided in the chassis portion 701 and an upper hole provided in the barrel portion 702. There is a gap A between the inner hole wall of the upper hole and the outer circumferential wall surface of the upper conduit portion 202, 0.2 mm ≤ A ≤ 0.4 mm. The above gap A ensures the flexible rotation of the spring mounting base 7.

[0034] In some embodiments, the cylinder head 1 is provided with an oil discharge hole 102 perpendicular to the axis of the valve, and there is a distance T2 between the stepped surface of the stepped hole and the hole wall of the oil discharge hole 102, 1.5mm≤T2≤2.5mm. The distance T2 ensures that the mating surfaces of the spring mounting base 7 and the mounting stop 201 are fully lubricated and the oil circulates.

[0035] In some embodiments, there is a gap T3 between the inner hole wall of the lower hole and the outer cylindrical surface of the mounting stop 201, 0.8mm≤T3≤1mm. The gap A ensures the flexible rotation of the spring mounting base 7. The gap T3 ensures good rotation without excessively weakening the valve seat strength.

[0036] In some embodiments, the lower guide tube portion 203 of the valve guide tube 2 is interference-fitted with the valve guide tube mounting hole 101 .

[0037] In some embodiments, Figure 2 As shown, the interference between the lower guide tube portion 203 and the valve guide installation hole 101 is L, 0.001mm≤L≤0.033mm. The spring mounting base 7 and the valve guide 2 are installed and matched, and the spring mounting base 7 exerts pressure on the valve guide 2, and the pressure produces a sealing surface pressure effect. Therefore, the interference between the outer circle of the valve guide 2 and the valve guide installation hole 101 on the cylinder head 1 can be designed to be very small. Therefore, the interference L can be selected from 0.001mm to 0.033mm, which is 1 times smaller than the interference fit amount at this point in the prior art. After the valve guide 2 is transferred into the cylinder head 1, the valve guide installation hole 101 matched with the valve 4 has a small deformation, and the valve guide installation hole 101 does not need to be ground. The clearance between the matching surfaces of the valve 4 and the valve guide 2 can meet the use requirements, reducing the processing cost and facilitating the replacement and maintenance of the valve guide 2 in the future.

[0038] In some embodiments, a sealing ring 8 is provided between the stem of the valve 4 and the inner wall of the valve guide 2 .

[0039] In the prior art, the valve spring is directly supported on the structure of the cylinder head, and the rotary valve mechanism will drive the valve spring to rotate slightly, causing certain wear on the cylinder head. The rotary valve mechanism of the diesel engine of the utility model is designed with a spring mounting base 7, and the spring mounting base 7 is directly mounted on the wear-resistant valve guide 2. There is a gap T1 between the bottom end face of the spring mounting base 7 and the upper end face of the valve guide mounting hole 101, so that the valve spring 6 contacts the spring mounting base 7, while the valve spring 6 does not directly contact the cylinder head 1, thereby eliminating the wear of the cylinder head 1.

[0040] In some embodiments, the spring mounting base 7 is hardened, and because the valve guide 2 itself is made of wear-resistant material, the wear resistance of the entire valve system is greatly improved, ensuring the reliable and stable operation of the valve system.

[0041] The present invention is not limited to the above embodiments, and all improvements made based on the concept, principle, structure and method of the present invention are within the protection scope of the present invention.

Claims

1. A rotary valve mechanism of a diesel engine, the rotary valve mechanism being mounted on a cylinder head, the rotary valve mechanism comprising a valve, a rotary valve mechanism, a valve guide, a valve spring and a valve seat ring, the valve guide and the valve seat ring being coaxially arranged are fixedly mounted on the cylinder head, the stem of the valve passes through the valve seat ring, the cylinder head and the valve guide in sequence from bottom to top, the rotary valve mechanism and the valve spring are sleeved on the stem of the valve, characterized in that: The valve guide comprises a mounting stop, an upper guide portion and a lower guide portion respectively located at the upper and lower sides of the mounting stop, a valve guide mounting hole is opened on the cylinder head, the lower guide portion is fixedly mounted in the valve guide mounting hole, and the lower end surface of the mounting stop is in contact with the upper end surface of the valve guide mounting hole. A spring mounting base is sleeved on the valve guide, a gap is provided between the bottom end surface of the spring mounting base and the upper end surface of the valve guide mounting hole, and the valve spring is located between the rotary valve mechanism and the spring mounting base.

2. The rotary valve mechanism of a diesel engine according to claim 1, characterized in that: The spring mounting base is fixedly mounted on the upper conduit portion of the valve conduit and the mounting stop.

3. The rotary valve mechanism of a diesel engine according to claim 2, characterized in that: Assume that the gap between the bottom end surface of the spring mounting base and the upper end surface of the valve guide mounting hole is T1, 1.5mm≤T1≤2mm.

4. The rotary valve mechanism of a diesel engine as claimed in claim 2, characterized in that: The spring mounting base includes a chassis portion and a barrel portion protruding from the upper end surface of the chassis portion. The spring mounting base is provided with a stepped hole, and the stepped hole includes a lower hole opened in the chassis portion and an upper hole opened in the barrel portion.

5. The rotary valve mechanism of a diesel engine according to claim 4, characterized in that: There is a gap A between the inner hole wall of the upper hole and the outer circular wall surface of the upper conduit portion, 0.2mm≤A≤0.4mm.

6. The rotary valve mechanism of a diesel engine according to claim 4, characterized in that: The cylinder head is provided with an oil unloading hole perpendicular to the axis of the valve, and there is a distance T2 between the step surface of the step hole and the hole wall of the oil unloading hole, 1.5mm≤T2≤2.5mm.

7. The rotary valve mechanism of a diesel engine as claimed in claim 4, characterized in that: There is a gap T3 between the inner hole wall of the lower hole and the outer cylindrical surface of the mounting stop, 0.8mm≤T3≤1mm.

8. The rotary valve mechanism of a diesel engine according to claim 1, characterized in that: The lower conduit portion of the valve conduit is interference-fitted with the valve conduit mounting hole.

9. The rotary valve mechanism of a diesel engine according to claim 8, characterized in that: Assuming that the interference between the lower guide tube portion and the valve guide installation hole is L, 0.001 mm≤L≤0.033 mm.

10. The rotary valve mechanism of a diesel engine according to claim 1, characterized in that: A sealing ring is arranged between the stem of the valve and the inner wall of the valve guide tube.

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