Valve rod end spline type locking and clamping groove structure device

Abstract

The invention relates to the technical field of valve rod locking and clamping groove structures, in particular to a valve rod end spline type locking and clamping groove structure device which comprises a valve rod body, the valve rod body comprises a rod piece, the rod piece is composed of an upper section and a lower section, and the upper section and the lower section of the rod piece are connected and fixed through a spline shaft. A locking and clamping groove structure is formed in a concave surface between the rod piece and the spline shaft; two locking and clamping pieces are symmetrically buckled on the surface of the spline shaft, each locking and clamping piece comprises a locking and clamping piece, and the locking and clamping pieces are buckled on the surface of the spline shaft. Through the design of the continuous gradually-changing locking and clamping grooves and the locking and clamping disc on the surface of the spline shaft and the design of the curvature groove, no sharp corner exists in the design, large-radius transition is achieved, the stress concentration point of a traditional locking and clamping groove is eliminated, compared with a traditional structure, the peak stress is reduced by more than half, the fatigue life is prolonged, and the fracture risk caused by stress concentration of a traditional straight groove and a traditional inclined groove is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve stem lock groove structure, and particularly relates to a valve stem end spline type lock groove structure device. BACKGROUND

[0002] In the field of internal combustion engine technology, the valve mechanism is an important part of the engine, and its performance directly affects the working efficiency and reliability of the engine. The valve stem, as one of the key components of the valve mechanism, its end lock groove structure is of great significance to ensure the correct installation and stable work of the valve. The main function of the valve stem lock groove is to fix the position of the valve stem, so that it remains stable between the valve spring retainer rings. This helps to ensure that the valve can be accurately opened and closed during engine operation, thereby ensuring the normal operation of the engine. The lock groove is used in cooperation with the valve lock, which can effectively prevent the valve from falling off in high temperature and high pressure environment. This is crucial to ensure the safety and reliability of the engine. The lock groove can also provide a certain guiding function for the valve stem, ensuring smooth up and down movement of the valve stem in the valve guide, reducing friction and wear.

[0003] The traditional valve stem end lock groove structure mostly adopts simple straight groove or inclined groove design. Although this design can meet the basic locking requirements, it has some shortcomings in actual use. For example, the lock is prone to looseness in long-term high temperature and high pressure environment, leading to poor valve sealing and even the risk of valve falling off. Moreover, the lock is prone to fatigue damage during long-term use, causing excessive wear of the lock groove during use, resulting in insufficient smoothness inside the lock groove, which shortens the service life of the valve stem. This not only increases the maintenance cost, but also may affect the overall performance and reliability of the engine. Therefore, a valve stem end spline type lock groove structure device is needed to solve the above problems. SUMMARY

[0004] The purpose of the present application is to solve the problems raised in the background.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A valve stem end spline type lock groove structure device, comprising a valve stem body, the valve stem body comprising a rod, the rod consisting of an upper segment and a lower segment, the upper segment and the lower segment being connected and fixed by a spline shaft, and a concave surface being formed between the rod and the spline shaft to form a lock groove structure;

[0007] The surface of the spline shaft is symmetrically buckled with two lock pieces, the lock piece comprising a lock piece, the lock piece being buckled on the surface of the spline shaft.

[0008] Preferably, the spline shaft surface is a continuously smooth changing gradient curvature groove design, the spline shaft is matched with the snap ring, and the traditional right angle groove or single circular arc transition is abandoned. The spline shaft surface locking groove is designed as a continuous and smooth changing curved surface. The groove bottom and groove wall adopt a large radius continuous transition without any sharp corners or small radius mutations, and the stress concentration points of the traditional groove bottom and groove shoulder are eliminated.

[0009] Preferably, the spline shaft surface is surrounded by a plurality of key grooves, and the inner side of the snap ring is provided with a locking disc matched with the key groove. When the two locking pieces are buckled on the spline shaft surface, the snap ring is buckled on the spline shaft surface, and the locking disc on the inner side of the snap ring is buckled in the key groove to prevent relative displacement between the spline shaft and the locking piece.

[0010] Preferably, the upper and lower sides of the locking disc are designed as curved edges, and the inner side of the locking disc is inserted into the key groove. The curved surface of the locking disc is sheared to transmit, so that the contact area is increased by more than one time. The elastic deformation of the curved surface of the locking disc can absorb impact, so that the system damping is increased by 40%. Compared with the thermal expansion difference of the traditional straight spline, the cold state interference message is generated, and the gap is generated. The curved surface design of the locking disc preloads the axial curvature. At high temperature, the rod expands, the normal deformation of the curved surface is changed, and the radial compression force is automatically increased.

[0011] Preferably, a repair part is arranged at a position close to the spline shaft in the rod. The repair part includes a fluoropolymer layer arranged on the spline shaft surface. The fluoropolymer layer forms a composite coating on the spline shaft surface. When micro-motion occurs, the friction heat causes the spline shaft and the rod surface to heat, so that the solid lubricant slow-release cavity is heated and fused, the lubricant is released from the solid lubricant slow-release cavity, and the lubricant is dropped and covered on the spline shaft surface along the scattering hole, so as to continuously provide lubrication and significantly reduce the friction coefficient and wear rate.

[0012] Preferably, a solid lubricant slow-release cavity is arranged in the rod, and a plurality of scattering holes are arranged around the bottom end of the solid lubricant slow-release cavity. The scattering holes are arranged around the bottom end of the solid lubricant slow-release cavity. After the solid lubricant slow-release cavity is liquefied, the solid lubricant slow-release cavity is liquefied, and the solid lubricant slow-release cavity is liquefied. After the solid lubricant slow-release cavity is liquefied, the solid lubricant slow-release cavity is liquefied, and the solid lubricant slow-release cavity is liquefied.

[0013] Preferably, a groove is arranged on the surface of the rod close to the top end of the spline shaft, and a perfusion hole is arranged in the groove and communicated with the solid lubricant slow-release cavity. The groove design on the side of the rod can conveniently guide the installation of the locking piece. When the locking piece is installed, the top end indicating groove, the groove and one of the key grooves are kept at the same level, so as to ensure the convenience of the locking piece installation.

[0014] Preferably, the two locking clip top ends are provided with indication grooves, and the indication grooves are located on the same horizontal line with the key grooves. When the two oppositely arranged locking clips are installed, the indication grooves and the key grooves can be aligned, so that the locking clips can be quickly buckled on the surface of the spline shaft, and the clamping state of the locking disc and the key groove can be quickly and accurately positioned.

[0015] Preferably, the spline shaft surface is provided with two concave arc surfaces, and the depth of the lower one is greater than that of the upper one. The spline shaft surface is a curved and smooth surface. The spline shaft surface key groove is decomposed in the normal direction of the curved surface, which generates a radial compression component, thereby enhancing the self-locking force between the locking disc and the key groove. The lower arc surface of the spline shaft surface is deeper than the upper arc surface, forming a progressive locking force distribution. The upper end provides orientation and positioning, and the lower end bears the main locking force, thereby avoiding single-point overload. The spline shaft groove bottom and the side wall are fused into a continuous curved surface with a large radius of curvature, eliminating all sharp corners and reducing the stress concentration coefficient by 50%.

[0016] The present application has at least the following advantages:

[0017] 1. By designing the continuous and gradually changing locking groove on the surface of the spline shaft and the locking disc, the curvature groove is designed without sharp corners and large radius transition, eliminating the stress concentration points of the traditional locking groove. Compared with the traditional structure, the peak stress is reduced by more than half, the fatigue life is improved, and the risk of fracture caused by stress concentration of the traditional straight groove and inclined groove is solved.

[0018] 2. The curved surface of the locking disc is pre-installed with axial curvature. When the temperature is high, the locking disc is deformed radially by using the thermal expansion of the rod to automatically enhance the compression force. The curved surface gradient of the key groove guides the assembly, so that the locking force increases with the increase of temperature, and the sealing failure problem caused by high temperature loosening is completely solved.

[0019] 3. Repair parts are arranged inside and on the surface of the rod. The friction generates heat to melt the solid lubricant, which covers the surface of the spline shaft through the scattering hole, reduces the friction coefficient, and forms a transfer film after the fluoropolymer layer of the fluoropolymer is heat-conducted, thereby repairing the micro-abrasion and prolonging the service life of the valve rod. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 An external structure schematic diagram of a valve rod end spline type locking groove structure device is provided.

[0022] Figure 2 An external disassembly structure schematic diagram of a valve stem end spline type lock clip groove structure device proposed by the present application;

[0023] Figure 3 An inside structure schematic diagram of a lock clip piece in a valve stem end spline type lock clip groove structure device proposed by the present application;

[0024] Figure 4 An external structure schematic diagram of a valve stem body in a valve stem end spline type lock clip groove structure device proposed by the present application;

[0025] Figure 5 A side view plane structure schematic diagram of a valve stem end spline type lock clip groove structure device proposed by the present application;

[0026] Figure 6 A cut structure schematic diagram of a valve stem body in a valve stem end spline type lock clip groove structure device proposed by the present application;

[0027] Figure 7 A top view plane structure schematic diagram of a valve stem end spline type lock clip groove structure device proposed by the present application.

[0028] In the figure: 1, valve stem body; 11, stem piece; 12, spline shaft; 13, keyway; 14, repair part; 141, fluoropolymer layer; 142, groove; 143, perfusion hole; 144, solid lubricant slow-release cavity; 145, scattered hole; 2, lock clip piece; 21, lock clip piece; 22, clasp; 23, lock clip disc. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0030] REFERENCE Figures 1-7 A valve stem end spline type lock clip groove structure device, comprising a valve stem body 1, the valve stem body 1 comprising a stem piece 11, the stem piece 11 being composed of two upper and lower segments, the stem piece 11 upper segment and the stem piece 11 lower segment being connected and fixed through a spline shaft 12, the stem piece 11 and the spline shaft 12 forming a lock clip groove structure;

[0031] The spline shaft 12 surface is symmetrically buckled with two lock clip pieces 2, the lock clip piece 2 comprising a lock clip piece 21, the lock clip piece 21 being buckled on the spline shaft 12 surface.

[0032] The spline shaft 12 surface is designed as a continuously smooth changing gradient curvature groove, the spline shaft 12 and the clasp 22 being adaptively fitted.

[0033] The spline shaft 12 is provided with a plurality of key grooves 13 around the surface, and the inner side of the clamping ring 22 is provided with a locking chuck 23 matched with the key groove 13.

[0034] The upper and lower sides of the locking chuck 23 are designed as curved edges, and the inner arc surface of the locking chuck 23 is inserted into the inside of the key groove 13.

[0035] The repair part 14 is arranged at the position close to the spline shaft 12 inside the rod member 11, and the repair part 14 includes a fluoropolymer layer 141 arranged on the surface of the spline shaft 12.

[0036] The solid lubricant slow-release cavity 144 is arranged inside the rod member 11, and a plurality of scattering holes 145 are arranged around the bottom end of the solid lubricant slow-release cavity 144.

[0037] The recess 142 is arranged at the position close to the top end of the spline shaft 12 on the surface of the rod member 11, and the perfusion hole 143 is arranged inside the recess 142 and connected with the solid lubricant slow-release cavity 144.

[0038] The top end of each of the two locking clamps 21 is provided with an indicating groove, and the indicating groove is in the same horizontal line with the key groove 13.

[0039] The surface of the spline shaft 12 is provided with two inner concave arc surfaces, and the depth of the lower one is greater than that of the upper one, and the surface of the spline shaft 12 is a curved and smooth surface.

[0040] The spline shaft 12 surface locking groove is designed as a continuous and smooth curved surface instead of a traditional right-angle groove or a single circular arc transition, the groove bottom and groove wall adopt a large-radius continuous transition without any sharp corners or small-radius mutations, the stress concentration points of the traditional groove bottom and groove shoulder are eliminated, the stress is smoothly and uniformly dispersed to a larger rod volume and a longer path, the peak stress is greatly reduced, when the two locking clamps 21 are buckled on the surface of the spline shaft 12, the clamping ring 22 is buckled on the surface of the spline shaft 12, the locking chuck 23 inside the clamping ring 22 is buckled in the key groove 13, the relative displacement between the spline shaft 12 and the locking clamp 21 is prevented, the clamping ring 22 is prevented from being separated from or loosened in the locking groove outside the spline shaft 12, the indicating groove of the locking clamp 21 is horizontally aligned with the key groove 13, one-step positioning is realized, and the assembly time is shortened.

[0041] The contact area is increased by more than 2 times through the curved surface shear transmission of the locking chuck 23. The curved surface elastic deformation of the locking chuck 23 can absorb the impact, so that the system damping is increased by 40%. Compared with the thermal expansion difference of the traditional straight spline, the cold-state interference message is generated, and the gap is generated. The curved surface design of the locking chuck 23 is pre-axial curvature. The rod 11 expands at high temperature, so that the normal deformation of the curved surface is automatically increased. The radial compression force is increased. At the same time, the locking chuck 23 cooperates with the locking ring 22, so that the locking piece 21 can be rotated in the tangential direction. The curved gradient of the key groove 13 is guided to be accurately positioned, so that the assembly failure rate is effectively reduced. The locking chuck 23 is embedded in the key groove 13 to form a three-dimensional constraint, so that the axial displacement and the circumferential loosening are completely eliminated.

[0042] The fluorine-containing polymer layer 141 forms a composite coating on the surface of the spline shaft 12. When the micromotion occurs, the friction heat causes the surface of the spline shaft 12 and the rod 11 to heat, so that the solid lubricating medium in the solid lubricant slow-release cavity 144 is heat-fused, the lubricant is released from the solid lubricant slow-release cavity 144, and the lubricant is dropped to cover the surface of the spline shaft 12 along the scattering hole 145, so that the lubrication is continuously provided, the friction coefficient and the wear rate are significantly reduced, and the fluorine-containing polymer layer 141 can form a transfer film during the friction process, so that the slight wear of the surface of the spline shaft 12 has a certain repair effect. The scattering hole 145 is provided with a plurality of scattering holes 145, which are distributed around the bottom end of the solid lubricant slow-release cavity 144. After the solid lubricating medium is liquefied, it can be dropped. After the multi-point dropping, the coating film can be formed on the surface of the spline shaft 12 to improve the lubrication and reduce the wear effect. The scattering hole 145 is an annular array of 8-12 micropores with a pore diameter of 0.2-0.5 mm, which can ensure that the lubricant uniformly covers the surface of the spline shaft 12.

[0043] The groove 142 on the side of the rod 11 is designed to facilitate the installation of the locking piece 21. When the locking piece 21 is installed, the top end of the locking piece 21, the groove 142 and one of the key grooves 13 are kept at the same level, so that the convenience of the locking piece 21 is ensured. When the two opposite locking pieces 21 are installed, the indication groove and the key groove 13 can be aligned, so that the locking piece 21 can be quickly buckled on the surface of the spline shaft 12, and the clamping state of the locking chuck 23 and the key groove 13 can be accurately positioned. If the indication groove is not aligned with the key groove, the curved edge of the locking chuck will be clamped in the curved transition area of the spline shaft, and cannot be slid into the key groove. The forced assembly is stopped.

[0044] The spline shaft 12 groove bottom and side wall are fused into a large curvature radius continuous curved surface, eliminating all sharp corners, the stress concentration coefficient is reduced, the peak stress can be reduced by 50%, the fatigue life can be increased by 3-5 times, the spline shaft 12 surface keyway 13 is decomposed in the normal direction of the curved surface, a radial compression component is generated, the self-locking force between the locking chuck 23 and the keyway 13 can be enhanced, the lower arc surface of the spline shaft 12 outer surface is deeper than the upper arc surface, forming a progressive locking force distribution, the upper end provides orientation and positioning, and the lower end bears the main locking force, avoiding single point overload, the locking chuck 23 is preloaded with negative curvature, linear contact at room temperature, the rod expands to drive the normal deformation of the locking chuck 23 at high temperature, the contact is changed to surface contact and the radial compression force is increased, and the compression force is increased by 15-20% when the temperature rises to 200 DEG C.

[0045] Working principle: according to Figure 2 、 Figure 3 and Figure 7 , when in use, the two locking clamping pieces 21 top end indicating grooves are aligned with two opposite key grooves 13 on the surface of the spline shaft 12, the locking clamping pieces 21 are buckled on the surface of the spline shaft 12 to form a wrapping, and the locking chuck 23 is embedded into the key groove 13, thereby preventing the locking clamping piece 21 from moving loose;

[0046] Secondly, according to Figure 5 and Figure 6 , a fluorine polymer layer 141 is arranged on the spline shaft 12 top end arc surface, lubricant is injected into the solid lubricant slow-release cavity 144 through external auxiliary tools or syringes, when the rod 11 moves up and down, the surface temperature of the rod 11 rises, the fluorine polymer layer 141 is in a semi-melted state, the solid lubricant in the solid lubricant slow-release cavity 144 is heated and melted, accompanied by the vibration force brought by the movement of the rod 11, the lubricant drips along the scattered holes 145, so that the lubricating medium can be applied to the surface of the spline shaft 12, and the wear degree of the surface of the spline shaft 12 is reduced.

[0047] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A spline-type locking groove structure device for valve stem end, characterized in that, It includes a valve stem body (1), the valve stem body (1) includes a rod (11), the rod (11) is composed of upper and lower sections, the upper section and the lower section of the rod (11) are connected and fixed by a spline shaft (12), and a locking groove structure is formed between the concave surfaces of the rod (11) and the spline shaft (12); Two locking clips (2) are symmetrically fastened to the surface of the spline shaft (12). The locking clips (2) include locking pieces (21) which are fastened to the surface of the spline shaft (12).

2. The valve stem end spline-type locking groove structure device according to claim 1, characterized in that, The surface of the spline shaft (12) is designed with a continuously smooth gradient curvature groove, and the spline shaft (12) is adapted to fit the retaining ring (22).

3. The valve stem end spline-type locking groove structure device according to claim 2, characterized in that, The spline shaft (12) has several keyways (13) around its surface, and the inner side of the retaining ring (22) is provided with a locking disc (23) that is adapted to engage with the keyways (13).

4. The valve stem end spline-type locking groove structure device according to claim 3, characterized in that, The upper and lower sides of the locking disc (23) are designed with curved edges, and the inner curved surface of the locking disc (23) is inserted into the keyway (13).

5. The valve stem end spline-type locking groove structure device according to claim 1, characterized in that, A repair component (14) is provided inside the rod (11) near the spline shaft (12). The repair component (14) includes a fluoropolymer layer (141) and is disposed on the surface of the spline shaft (12).

6. The valve stem end spline-type locking groove structure device according to claim 5, characterized in that, The rod (11) has a solid lubricant slow-release cavity (144) inside, and a number of scattering holes (145) are arranged around the bottom end of the solid lubricant slow-release cavity (144).

7. The valve stem end spline-type locking groove structure device according to claim 6, characterized in that, The rod (11) has a groove (142) on its surface near the top of the spline shaft (12), and the groove (142) has an injection hole (143) that communicates with the solid lubricant slow-release chamber (144).

8. The valve stem end spline-type locking groove structure device according to claim 1, characterized in that, The top of each of the two locking clips (21) is provided with an indicator groove, and the indicator groove and the keyway (13) are located on the same horizontal line.

9. The valve stem end spline-type locking groove structure device according to claim 1, characterized in that, The surface of the spline shaft (12) is provided with two concave arc surfaces, and the depth of the lower concave arc surface is greater than the depth of the upper concave arc surface. The surface of the spline shaft (12) is a curved smooth surface.

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