Engine cylinder head rocker arm combined structure and engine
By setting a gap and blocking part in the engine, the squeeze pressure of the rocker shaft to the rocker seat is dispersed, and the problems of rocker seat wear and deformation are solved, achieving a longer service life and lower vibration and noise.
Patent Information
- Application Number
- CN202421373628.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-06-17
AI Technical Summary
In an internal combustion engine, the radial compression of the rocker shaft to the rocker seat causes the rocker seat to wear and deformation.
By providing a gap between the rocker arm seat and the support seat, and providing a barrier on the rocker arm seat to limit the circumferential rotation and axial displacement of the rocker arm shaft, the squeezing pressure and the friction are reduced.
It effectively reduces wear and deformation of the rocker seat, extends the engine service life, and reduces vibration and noise.
Smart Images
Figure CN222478778U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, in particular to an engine cylinder head rocker arm combination structure and an engine. Background Art
[0002] The intake and exhaust mechanism of an internal combustion engine is composed of parts such as a camshaft, a tappet, a rocker arm, a rocker shaft, a rocker seat, a valve, and a valve spring, which are used to control the opening and closing of the intake and exhaust valves, the entry of air and fuel, and the discharge of exhaust gas; wherein the rocker shaft is passed through a through hole provided in the rocker seat, and the rocker arm is mounted on the rocker seat through the rocker shaft. When working, the rocker arm swings back and forth around the rocker shaft.
[0003] When the internal combustion engine is running, the rocker arm swings at high speed around the rocker shaft, causing the rocker shaft to continuously radially squeeze the through hole of the rocker seat. Since the rocker seat is generally made of aluminum, and the rocker shaft and rocker arm are made of steel, the aluminum part is relatively soft, which can easily cause wear of the through hole of the rocker seat. Utility Model Content
[0004] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide an engine cylinder head rocker arm assembly structure whose rocker arm seat is not easily worn or deformed.
[0005] The technical solution adopted by the utility model is as follows:
[0006] An engine cylinder head rocker arm assembly structure includes a rocker arm seat and a rocker arm shaft, and also includes a blocking portion, wherein the blocking portion is used to limit the circumferential rotation and axial displacement of the rocker arm shaft, the rocker arm seat is installed on the bottom wall of the cylinder head housing, a support seat is provided on the bottom wall of the cylinder head housing, a gap is provided between the support seat and the rocker arm seat, a first through hole is provided on the rocker arm seat, a second through hole is provided on the support seat, and the rocker arm shaft passes through the first through hole and the second through hole in sequence.
[0007] Compared with the prior art, the beneficial effects of the present invention are:
[0008] 1. The support seat and the rocker arm seat are provided to support the rocker arm shaft together, so that the radial extrusion force on the rocker arm shaft and the rocker arm seat when the rocker arm swings is dispersed, so that the rocker arm seat is not easy to wear and deform.
[0009] 2. The axial position of the rocker arm shaft is limited by the protrusion, which reduces the friction between the rocker arm seat and the rocker arm shaft, thereby reducing the wear of the rocker arm seat.
[0010] As a preferred embodiment of the utility model, a first vertical hole connected to the first through hole is vertically opened on the rocker arm seat, a second vertical hole connected to the first vertical hole is vertically opened on the rocker arm shaft, and the blocking part includes a locking piece, which is inserted into the first vertical hole and the second vertical hole in sequence.
[0011] Beneficial effect: After the locking piece is inserted into the first vertical hole and the second vertical hole, the rocker arm shaft cannot rotate circumferentially and move axially, thereby reducing the wear of the rocker arm seat.
[0012] As a preferred embodiment of the present invention, the second vertical hole is a threaded hole, the locking member is a screw, and the screw passes through the first vertical hole and is screwed to the threaded hole.
[0013] Beneficial effect: Through the cooperation between the screw and the threaded hole, the threaded connection makes the rocker shaft unable to move or rotate axially, and the disassembly and assembly of the rocker shaft is more convenient and quick
[0014] As a preferred embodiment of the utility model, the second through hole is a stepped hole, a notch is provided on the side wall of the rocker shaft, the notch includes a first vertical contact surface and a second vertical contact surface, and the first contact surface and the second contact surface are in close contact with the inner wall of the stepped hole.
[0015] Beneficial effects: Through the stepped hole, the first contact surface and the second contact surface, the rocker shaft cannot rotate axially and axially, reducing the overall length of the rocker shaft, reducing production costs, and the contact area for limiting is larger, the force is more uniform, and the force surface of the support seat is not easily deformed.
[0016] As a preferred embodiment of the utility model, the blocking part includes a limiting rod, a slot is provided on the side wall of the rocker arm shaft, the slot includes a vertical first contact surface and a second contact surface, a fifth through hole is provided on the support seat, the fifth through hole is connected to the second through hole, the limiting rod passes through the fifth through hole, and rests against the first contact surface and the second contact surface.
[0017] Beneficial effects: By setting the first contact surface and the limit rod for limiting, the circumferential rotation of the rocker arm shaft is restricted and the wear of the rocker arm seat is reduced. By setting the fifth through hole, the wall thickness of the support seat is reduced to avoid an increase in internal air holes and shrinkage defects caused by excessive thickness during the die-casting of the rocker arm seat. Axial limiting is performed by the protrusion and the second contact surface, so that the force is more uniform and deformation is not easy to occur. During installation, the rocker arm shaft is inserted first, and then the limit rod is inserted, which is easy to install.
[0018] As a preferred embodiment of the utility model, the number of the rocker arm seats and the rocker arm shafts are both two groups, and the two groups of the rocker arm seats and the rocker arm shafts are symmetrically arranged along the axial center line of the cylinder head and close to the axial center line of the cylinder head; the blocking portion includes a baffle, and slots are opened on the side walls of the two rocker arm shafts, and the two slots are both engaged on the baffle.
[0019] Beneficial effects: Since the cylinder head itself is located obliquely above the crankcase, when the weight of the cylinder head increases, the center of gravity of the engine will shift toward the tilt direction of the cylinder head. The shift in the center of gravity of the engine will produce greater vibration and noise during operation; by symmetrically arranging two sets of rocker arm seats and rocker arm shafts, and close to the axial center line of the cylinder head, the overall center of gravity offset of the engine is reduced, thereby reducing the vibration and noise of the engine; by setting baffles, the rocker arm shafts on both sides can be locked, and after limiting the rocker arm shafts, the wear of the rocker arm seats is reduced.
[0020] As a preferred embodiment of the present invention, the distance between the support seat and the rocker arm is 0.6 mm to 1.2 mm.
[0021] Beneficial effects:
[0022] 1. When the engine is lubricating, the oil is pressurized and sent to the cylinder head through the oil pump at the bottom. The oil is sprayed out from the oil hole of the cylinder head. Part of the oil falls on the rocker arm, rocker arm shaft and rocker arm seat. Under the swing of the rocker arm and the influence of gravity, it enters between the rocker arm and the rocker arm shaft, and between the rocker arm shaft and the rocker arm seat for lubrication, while the remaining oil falls to the bottom wall of the cylinder head housing and flows out along the reflux hole of the bottom wall. By setting a support seat, part of the oil that falls to the bottom wall of the cylinder head housing falls on the support seat and flows into the gap between the support seat and the rocker arm. By setting a gap of 0.6mm to 1.2mm, the oil in the gap is more likely to contact the outer wall of the rocker arm, thereby increasing the oil flow on the rocker arm per unit time and improving the cooling effect of the oil on the rocker arm.
[0023] 2. The engine oil itself contains a certain amount of dispersant, which can carry away internal carbon deposits and wear particles, and the direction of the oil hole cannot be changed. Therefore, after the engine oil is sprayed out, the outer wall of the rocker arm is not easy to contact with the engine oil. By setting this gap, the engine oil is fully in contact with the support seat and the rocker arm, which has a better cleaning effect.
[0024] As a preferred embodiment of the present invention, a notch is provided at the upper end of the rocker arm seat, and the notch is located on the inner side of the rocker arm.
[0025] Beneficial effects:
[0026] 1. The pressurized engine oil is sprayed out from the oil hole of the cylinder head. The sprayed engine oil is relatively scattered, and part of the engine oil falls on the upper end surface of the rocker arm seat. There is a gap between the rocker arm seat and the rocker arm. When the gap is small, the engine oil is not easy to flow into the gap. By setting the gap, the engine oil on the upper end surface of the rocker arm seat flows into the gap and is blocked by the inner side of the rocker arm. Under the swing of the rocker arm, it is easier to flow into the gap between the rocker arm seat and the support seat, achieving a better lubrication effect;
[0027] After the cylinder head has been used for a long time, the internal parts will age and wear, which will cause the rocker arm to swing slightly offset. The inner side of the rocker arm may contact the rocker arm seat. By setting a notch, the contact area between the rocker arm and the rocker arm seat can be reduced, thereby reducing friction and slowing down the wear rate of the rocker arm seat.
[0028] As a preferred embodiment of the utility model, a protrusion is provided outwardly on the side wall of the cylinder head housing, and one end of the rocker arm shaft is inserted into the inner side of the protrusion.
[0029] Beneficial effect: By arranging the support seat, the rocker arm seat and the protrusion to jointly support the rocker arm shaft, the radial extrusion force generated on the rocker arm shaft and the rocker arm seat when the rocker arm swings is dispersed, making the rocker arm seat less prone to wear and deformation.
[0030] A second object of the present utility model is to provide an engine, comprising the above-mentioned engine cylinder head rocker arm assembly structure.
[0031] The engine of the utility model adopts the above-mentioned engine cylinder head rocker arm combination structure, so that the aging speed of the cylinder head is slower, the vibration generated by the rocker arm during long-term operation is smaller, and the service life of the engine is longer. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 This is a structural schematic diagram of a first embodiment of the engine cylinder head rocker arm assembly structure of the utility model;
[0033] Figure 2 It is a structural schematic diagram of a cylinder head housing of a first embodiment of the engine cylinder head rocker arm assembly structure of the utility model;
[0034] Figure 3 It is a structural schematic diagram of the rocker arm shaft of the second embodiment of the rocker arm assembly structure of the cylinder head of the utility model;
[0035] Figure 4 It is a cross-sectional view of the rocker arm shaft and the support seat of the second embodiment of the rocker arm assembly structure of the cylinder head of the utility model;
[0036] Figure 5 It is a cross-sectional view of the rocker arm shaft and the support plate of the third embodiment of the rocker arm assembly structure of the cylinder head of the utility model;
[0037] Figure 6 This is a schematic diagram of the structure of the rocker arm shaft and the limit rod of the fourth embodiment of the utility model engine cylinder head rocker arm assembly structure;
[0038] Figure 7 It is a structural schematic diagram of a fifth embodiment of the engine cylinder head rocker arm assembly structure of the utility model.
[0039] The reference numerals include: cylinder head housing 1, protrusion 13, third through hole 14, rocker arm seat 2, first through hole 21, notch 22, rocker arm shaft 3, support seat 4, second through hole 41, rocker arm 5, baffle 6, first contact surface 71, second contact surface 72, support plate 8, boss 81, limit rod 9, locking member 10. DETAILED DESCRIPTION
[0040] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.
[0041] In the description of the present application, the terms "first", "second", etc. are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0042] Embodiment 1:
[0043] See also Figure 1 As shown, this embodiment discloses an engine cylinder head rocker arm assembly structure, including a rocker arm seat 2 and a rocker arm shaft 3, wherein the rocker arm seat 2 is mounted on the bottom wall of the cylinder head housing 1, a support seat 4 is provided on the bottom wall of the cylinder head housing 1, a gap is provided between the support seat 4 and the rocker arm seat 2, a first through hole 21 is provided on the rocker arm seat 2, a second through hole 41 is provided on the support seat 4, and the rocker arm shaft 3 passes through the first through hole 21 and the second through hole 41 in sequence; by providing the support seat 4 and the rocker arm seat 2 to jointly support the rocker arm shaft 3, the radial extrusion force generated on the rocker arm shaft 3 and the rocker arm seat 2 when the rocker arm 5 swings is dispersed, so that the rocker arm seat 2 is not easy to wear and deform.
[0044] Among them, see Figure 1 As shown, after the rocker arm 5 is installed on the rocker arm seat 2, the distance between the rocker arm seat 2 and the support seat 4 is 4mm, the thickness of the side wall of the rocker arm 5 is 3mm, and the distance between the support seat 4 and the rocker arm 5 is 1mm; by setting the support seat 4, part of the engine oil that falls to the bottom wall of the cylinder head housing 1 falls on the support seat 4 and flows into the gap between the support seat 4 and the rocker arm 5. By setting a gap of 1mm, the engine oil in the gap is more likely to contact with the outer wall of the rocker arm 5, thereby increasing the oil flow rate on the rocker arm 5 per unit time and improving the cooling effect of the engine oil on the rocker arm 5; the engine oil itself contains a certain dispersant, which can carry away the internal carbon deposits and wear particles, and the direction of the oil hole cannot be changed. Therefore, after the engine oil is sprayed out, part of the outer wall of the rocker arm 5 is not easy to contact with the engine oil, and by setting the gap, the engine oil is fully in contact with the support seat 4 and the rocker arm 5, which has a better cleaning effect.
[0045] In other embodiments, the distance between the support base 4 and the rocker arm 5 may be 0.6 mm, 0.8 mm or 1.2 mm.
[0046] Among them, see Figure 2 As shown, a notch 22 is provided at the upper end of the rocker arm seat 2, and the notch 22 is located on the inner side of the rocker arm 5; by providing the notch 22, the engine oil at the upper end of the rocker arm seat 2 can more easily flow into the gap between the rocker arm seat 2 and the support seat 4, thereby achieving a better lubrication effect; when the rocker arm 5 swings and deviates slightly, the inner side of the rocker arm 5 may contact the rocker arm seat 2, and by providing the notch 22, the contact area between the rocker arm 5 and the rocker arm seat 2 is reduced, thereby reducing friction and further reducing the wear of the rocker arm seat 2.
[0047] Among them, see Figure 1 As shown, a third through hole 14 is vertically provided on the bottom wall of the cylinder head housing 1. By providing the third through hole 14, the wall thickness of the cylinder head housing 1 near the fourth through hole is reduced, thereby avoiding an increase in internal pores and shrinkage defects due to excessive thickness when the cylinder head housing 1 is die-cast; the engine cylinder head rocker arm assembly structure also includes a blocking portion, the blocking portion includes a blocking piece 6 installed on the cylinder head housing 1, a groove is provided on the side wall close to the rocker arm shaft 3, the blocking piece 6 is inserted into the groove, a fourth through hole is provided on the blocking piece 6, the fourth through hole is aligned with the third through hole 14, and a screw is inserted to fix it: by providing the cooperation of the blocking piece 6 and the groove, when the blocking piece 6 is engaged in the groove, the rocker arm shaft 3 cannot rotate circumferentially and move axially with the protrusion 13, thereby reducing the wear of the rocker arm seat 2 and the support seat 4.
[0048] In other embodiments, the opening of the slot faces downward, the baffle 6 is inserted into the slot, and supports the rocker arm shaft 3. The baffle 6, the support seat 4, the rocker arm seat 2, and the protrusion 13 jointly support and limit the rocker arm shaft 3, so that the rocker arm 5 is more stable when the rocker arm 5 swings.
[0049] Among them, the number of the rocker arm seats 2 and the rocker arm shafts 3 are both two groups, and the two groups of the rocker arm seats 2 and the rocker arm shafts 3 are symmetrically arranged along the axial center line of the cylinder head and close to the axial center line of the cylinder head; by symmetrically arranging and being close to the axial center line of the cylinder head, the overall center of gravity offset of the engine is reduced, thereby reducing the vibration and noise of the engine.
[0050] Among them, see Figure 1 As shown, the rocker arm seat 2 is integrally formed with the cylinder head housing 1, and the side wall of the cylinder head housing 1 is provided with a protrusion 13 outwardly, and one end of the rocker arm shaft 3 is inserted into the inner side of the protrusion 13: by providing the protrusion 13 on the side wall of the integrally formed cylinder head housing 1, there is no need to increase the side wall thickness of the cylinder body housing, the protrusion 13 limits the rocker arm shaft 3, and can be subjected to force together with the blocking part to avoid excessive local stress in the blocking part, which causes deformation of the blocking part.
[0051] Among them, see Figure 2 As shown, the geometric center of the protrusion 13 is lower than the geometric center of the first through hole 21; when the baffle 6 limits the two rocker shafts 3 at the same time, the two rocker shafts 3 need to be inserted into the rocker seat 2 and the support seat 4, and positioning and calibration are performed. The installer needs to control the rocker shaft 3 not to move while inserting the baffle 6 for installation, which makes the installation inconvenient; through the above structure, after the rocker shaft 3 is inserted into the support seat 4 and the rocker seat 2, it slides into the protrusion 13 due to gravity, automatically completes the positioning and fixation, and then the baffle 6 can be inserted into the slot for fixation, which is more convenient for installation.
[0052] Embodiment 2:
[0053] See also Figure 3 and Figure 4 As shown, on the basis of the first embodiment, the utility model further provides an engine cylinder head rocker arm combination structure, wherein the second through hole 41 is a stepped hole, and a notch is provided on the side wall of the rocker arm shaft 3, and the notch includes a vertical first contact surface 71 and a second contact surface 72, and the first contact surface 71 and the second contact surface 72 are tightly attached to the inner wall of the stepped hole, so that the rocker arm shaft 3 cannot rotate axially and axially. By replacing the baffle 6 and the notch in the first embodiment with the stepped hole, the first contact surface 71 and the second contact surface 72, the overall length of the rocker arm shaft 3 is reduced, the production cost is reduced, the contact area for limiting is larger, the force is more uniform, and the force surface of the support seat 4 is not easily deformed.
[0054] Embodiment three:
[0055] See also Figure 5 As shown, on the basis of the second embodiment, the utility model further provides an engine cylinder head rocker arm combination structure, wherein the first contact surface 71 is parallel to the horizontal plane, and the blocking portion includes a support plate 8, and the support plate 8 is mounted on the bottom wall of the cylinder head housing 1 by screws, and bosses 81 are provided on both sides of the support plate 8, and the two bosses 81 are respectively engaged with corresponding notches, and the first contact surface 71 is against the upper end surface of the boss 81, and the second contact surface 72 is against the side surface of the boss 81; the above structure has the following effects: First, the rocker arm shaft 3 is jointly supported by the support plate 8, the support seat 4, the rocker arm seat 2 and the protrusion 13, and when the rocker arm 5 swings, the rocker arm shaft 3 is subjected to force more evenly and is not easy to deform; second, an interlocking structure is formed by the support plate 8, the first contact surface 71 and the second contact surface 72, which is not easy to rotate circumferentially and displace axially, and after one of the rocker arm shafts 3 is deformed and worn, the other rocker arm shaft 3 will not be affected.
[0056] Embodiment 4:
[0057] See also Figure 6On the basis of the second embodiment, the utility model further provides an engine cylinder head rocker arm assembly structure, which also includes a limit rod 9. A fifth through hole is vertically opened on the support seat 4, and the fifth through hole is connected to the second through hole. The limit rod 9 passes through the fifth through hole and rests on the first contact surface 71 and the second contact surface 72. The first contact surface 71 and the limit rod 9 are set to limit, so as to limit the circumferential rotation of the rocker arm shaft 3 and reduce the wear of the rocker arm seat 2. The wall thickness of the support seat 4 is reduced by setting the fifth through hole to avoid the increase of internal pores and shrinkage defects caused by excessive thickness when the rocker arm seat 2 is die-cast; the axial limit is performed by the protrusion 13 and the second contact surface 72, so that the force is more uniform and deformation is not easy to occur. When installing, the rocker arm shaft 3 is inserted first, and then the limit rod 9 is inserted, which is convenient for installation.
[0058] Embodiment five:
[0059] See also Figure 7 On the basis of the first embodiment, the utility model further provides an engine cylinder head rocker arm assembly structure, wherein a first vertical hole connected to the first through hole is vertically opened on the rocker arm seat 2, and a second vertical hole connected to the first vertical hole is vertically opened on the rocker arm shaft 3, and the blocking portion also includes a locking piece 10, which is inserted into the first vertical hole and the second vertical hole in sequence, and the protrusion 13 and the blocking piece 6 are replaced by the locking piece 10; in this embodiment, the locking piece 10 adopts a screw, and the second vertical holes are both threaded holes. After the locking piece 10 is inserted into the first vertical hole and the second vertical hole, the rocker arm shaft cannot rotate circumferentially and move axially, thereby reducing the wear of the rocker arm seat. In other embodiments, the locking piece 10 can also use a bayonet.
[0060] A second object of the present utility model is to provide an engine, comprising the above-mentioned engine cylinder head rocker arm assembly structure.
[0061] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.
Claims
1. An engine cylinder head rocker arm assembly structure, comprising a rocker arm seat and a rocker arm shaft, wherein the rocker arm seat is mounted on the bottom wall of the cylinder head housing, and a first through hole is provided on the rocker arm seat, characterized in that: It also includes a blocking portion, which is used to limit the circumferential rotation and axial displacement of the rocker arm shaft. A support seat is provided on the bottom wall of the cylinder head housing, a gap is provided between the support seat and the rocker arm seat, a second through hole is provided on the support seat, and the rocker arm shaft passes through the first through hole and the second through hole in sequence.
2. The engine cylinder head rocker arm assembly structure according to claim 1, characterized in that: A first vertical hole connected to the first through hole is vertically opened on the rocker arm seat, a second vertical hole connected to the first vertical hole is vertically opened on the rocker arm shaft, and the blocking part includes a locking piece, which is inserted into the first vertical hole and the second vertical hole in sequence.
3. The engine cylinder head rocker arm assembly structure according to claim 2, characterized in that: The second vertical hole is a threaded hole, and the locking member is a screw. The screw passes through the first vertical hole and is threadedly connected with the threaded hole.
4. The engine cylinder head rocker arm assembly structure according to claim 1, characterized in that: The second through hole is a stepped hole. A notch is formed on the side wall of the rocker shaft. The notch includes a first vertical contact surface and a second vertical contact surface. The first contact surface and the second contact surface are in close contact with the inner wall of the stepped hole.
5. The engine cylinder head rocker arm assembly structure according to claim 1, characterized in that: The blocking part includes a limiting rod, a slot is provided on the side wall of the rocker shaft, the slot includes a vertical first contact surface and a second contact surface, a fifth through hole is provided on the support seat, the fifth through hole is connected to the second through hole, the limiting rod passes through the fifth through hole, and rests against the first contact surface and the second contact surface.
6. The engine cylinder head rocker arm assembly structure according to claim 1, characterized in that: The number of the rocker arm seats and rocker arm shafts is two groups, and the two groups of rocker arm seats and rocker arm shafts are symmetrically arranged along the axial center line of the cylinder head and close to the axial center line of the cylinder head; the blocking part includes a blocking plate, and slots are opened on the side walls of the two rocker arm shafts, and the two slots are clamped on the blocking plate.
7. The engine cylinder head rocker arm assembly structure according to claim 1, characterized in that: The upper end of the rocker arm seat is provided with a notch, and the notch is located on the inner side of the rocker arm.
8. The engine cylinder head rocker arm assembly structure according to claim 1, characterized in that: The distance between the support seat and the rocker arm is 0.6 mm to 1.2 mm.
9. The engine cylinder head rocker arm assembly structure according to claim 1, characterized in that: A protrusion is provided outwardly on the side wall of the cylinder head housing, and one end of the rocker arm shaft is inserted into the inner side of the protrusion.
10. An engine, characterized in that: The invention comprises an engine cylinder head rocker arm assembly structure according to any one of claims 1 to 9.