CN112177790A - Small engine cylinder head - Google Patents
Small engine cylinder head Download PDFInfo
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- CN112177790A CN112177790A CN202011104065.2A CN202011104065A CN112177790A CN 112177790 A CN112177790 A CN 112177790A CN 202011104065 A CN202011104065 A CN 202011104065A CN 112177790 A CN112177790 A CN 112177790A
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- bearing
- cylinder head
- groove
- air inlet
- exhaust
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- 238000002485 combustion reaction Methods 0.000 description 5
- 230000006837 decompression Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
- F02F1/4285—Shape or arrangement of intake or exhaust channels in cylinder heads of both intake and exhaust channel
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention discloses a small engine cylinder head, which comprises a cylinder head, a camshaft mounting assembly, a timing chain wheel, an air inlet assembly and an air outlet assembly, wherein the camshaft mounting assembly is arranged on the camshaft; the camshaft mounting assembly comprises a first bearing, a second bearing and a bearing pressure plate; the bearing pressure plate is embedded in a pressure plate groove of the cylinder head and is provided with an inserting tongue inserted into a ring groove of the outer wall of the first bearing. The invention has the advantage of small axial dimension.
Description
Technical Field
The invention relates to the field of engines, in particular to a miniaturized engine cylinder head.
Background
The cylinder head of the present engine adopts the arrangement of an SOHC (overhead single camshaft), in the arrangement, the camshaft is positioned at the center of the upper part of the cylinder head, the air intake component and the exhaust component are respectively positioned at two sides of the camshaft, and the camshaft is in linkage fit with the air intake component and the exhaust component to control the actions of the air intake component and the exhaust component, thereby completing the actions of air intake and exhaust after combustion.
The existing air inlet assembly comprises an air inlet valve, an air inlet rocker arm and an air inlet rocker arm shaft, wherein the air inlet rocker arm shaft is fixed on an air cylinder head and is parallel to a cam shaft; the exhaust assembly comprises an exhaust valve, an exhaust rocker arm and an exhaust rocker arm shaft, the exhaust rocker arm shaft is fixed on the cylinder head and is parallel to the camshaft, the exhaust rocker arm is rotatably sleeved on the exhaust rocker arm shaft, the exhaust rocker arm is connected with the exhaust valve, and the exhaust valve is movably matched on the cylinder head and used for controlling whether the combustion chamber exhausts; the camshaft is sequentially provided with a timing chain wheel, a bearing pressing plate, a first bearing, an exhaust cam, an intake cam and a second bearing, wherein the bearing pressing plate presses the axial end face of the first bearing; in addition, considering the pressure reduction requirement, the camshaft can be further provided with a one-way pressure reduction mechanism, and the timing chain wheel, the bearing pressing plate, the first bearing, the exhaust cam, the intake cam, the second bearing and the one-way pressure reduction mechanism can occupy a large axial installation space of the cylinder head along the axial direction of the camshaft.
The spark plug of the existing engine is generally obliquely installed on the cylinder head, so that the included angle between the spark plug and the central axis of the cylinder head needs to be reduced for improving the combustion efficiency of the engine, so that the ignition electrode of the spark plug can be closer to the center of a combustion chamber, and a better combustion effect is obtained. However, reducing the included angle of the spark plug requires enlarging the axial dimension of the compression cylinder head, so that sufficient axial installation space can be provided for installing the timing sprocket, the bearing pressing plate, the first bearing, the exhaust cam, the intake cam, the second bearing and the one-way pressure reducing mechanism, and the axial dimension of the cylinder head is large.
Disclosure of Invention
The invention aims to provide a small engine cylinder head with small axial dimension.
In order to achieve the above purpose, the solution of the invention is:
a miniaturized engine cylinder head comprises a cylinder head, a camshaft mounting assembly, a timing chain wheel, an air inlet assembly and an exhaust assembly; the cylinder head is provided with a first supporting seat and a second supporting seat which are oppositely arranged along the axial direction of the cylinder head; the first support seat is provided with a bearing hole and a pressure plate groove, the first bearing hole is axially communicated along the cylinder head, and the pressure plate groove is arranged on one axial end face of the first support seat; the second supporting seat is provided with a bearing groove opposite to the bearing hole, and the opening of the bearing groove faces the first supporting seat; the axial two ends of the camshaft are divided into a first end and a second end, and an air inlet cam and an air outlet cam which are positioned between the first end and the second end are matched on the camshaft; the camshaft mounting assembly comprises a first bearing, a second bearing and a bearing pressure plate; the inner ring of the first bearing is in interference fit with the first end of the camshaft, the first bearing penetrates through the bearing hole, the outer wall of the outer ring of the first bearing is provided with a ring groove, the inner ring of the second bearing is in interference fit with the second end of the camshaft, and the second bearing is embedded in the bearing groove; the bearing pressing plate is embedded in the pressing plate groove and is fixedly connected with the first supporting seat through a connecting piece, and the bearing pressing plate is provided with an inserting tongue inserted into the first bearing ring groove; the timing chain wheel is connected with the first end of the camshaft and is positioned on one side, far away from the second supporting seat, of the first supporting seat; the air inlet assembly and the air exhaust assembly are respectively positioned on two radial sides of the camshaft, and are respectively in linkage fit with the air inlet cam and the air exhaust cam.
And the ring groove of the first bearing outer ring and the ball groove of the inner wall of the first bearing outer ring are completely arranged in a staggered manner.
The air inlet assembly comprises an air inlet rocker shaft, an air inlet rocker arm and an air inlet valve, the air inlet rocker shaft is parallel to the camshaft, two ends of the air inlet rocker shaft are respectively connected with the first supporting seat and the second supporting seat, the air inlet rocker arm is rotatably sleeved on the air inlet rocker shaft and is in linkage fit with the air inlet valve, and the air inlet valve is movably matched on the cylinder head; the exhaust assembly comprises an exhaust rocker shaft, an exhaust rocker arm and an exhaust valve, the exhaust rocker shaft is parallel to the camshaft, two ends of the exhaust rocker shaft are respectively connected with the first supporting seat and the second supporting seat, the exhaust rocker arm is rotatably sleeved on the exhaust rocker shaft and is in linkage fit with the exhaust valve, and the exhaust valve is movably fitted on the cylinder head; and the intake cam and the exhaust cam are respectively in linkage fit with the intake rocker arm and the exhaust rocker arm.
The first support seat is provided with a first support hole and a second support hole, the second support seat is provided with a first support groove and a second support groove, the air inlet rocker shaft and the air exhaust rocker shaft respectively penetrate through the first support hole and the second support hole, and the air inlet rocker shaft and the air exhaust rocker shaft are respectively inserted into the first support groove and the second support groove.
The air inlet rocker arm shaft and the air exhaust rocker arm shaft are respectively provided with a rotation stopping port and a rotation limiting port; the bearing pressure plate is provided with a first limiting piece and a second limiting piece at two ends respectively, the first limiting piece is inserted into the rotation stopping port to limit the rotation of the air inlet rocker shaft, and the second limiting piece is inserted into the rotation limiting port to limit the rotation of the exhaust rocker shaft.
The first supporting seat is provided with a first communicating hole communicated with the pressure plate groove and the first supporting hole and a second communicating hole communicated with the pressure plate groove and the second supporting hole, and the first limiting piece and the second limiting piece of the bearing pressure plate respectively penetrate through the first communicating hole and the second communicating hole.
The miniaturized engine cylinder head also comprises a decompression mechanism; the pressure reducing mechanism comprises a one-way clutch, an ejector piece and a reset tension spring; the one-way clutch is sleeved on the camshaft, the ejector is rotatably sleeved on the exhaust rocker shaft, and the ejector movably abuts against the one-way clutch and the exhaust rocker; the reset tension spring is arranged along the direction perpendicular to the axial direction of the cylinder head, and two ends of the reset tension spring are respectively connected with the bearing plate and the ejection piece.
The ejection piece is arranged between the first supporting seat and the second supporting seat, the bearing pressing plate is arranged on one side, away from the second supporting seat, of the first supporting seat, the upper portion of the bearing pressing plate is bent towards the second supporting seat to form a connecting sheet, and the two ends of the reset tension spring are respectively connected with the connecting sheet and the ejection piece.
The top of the first supporting seat is provided with an arc-shaped limiting groove, and the reset tension spring is arranged in the arc-shaped limiting groove.
A screw hole is formed in a pressure plate groove of the first support seat, and a through hole is formed in the bearing pressure plate corresponding to the screw hole; the connecting piece is a connecting bolt which penetrates through the through hole and is in threaded connection with the screw hole, and the head part of the connecting bolt is positioned in the pressure plate groove.
After the scheme is adopted, the bearing pressing plate is embedded in the pressing plate groove of the axial end face of the first supporting seat, and the inserting tongue of the bearing pressing plate is inserted into the annular groove of the outer wall of the outer ring of the first bearing, so that the first supporting seat, the first bearing and the bearing pressing plate have an overlapping area in the axial direction of the cylinder head, the axial space occupation of the first supporting seat, the first bearing and the bearing pressing plate on the cylinder head can be further reduced, and the axial size of the bearing pressing plate is small.
Drawings
FIG. 1 is an exploded view of the present invention;
FIG. 2 is a partial schematic view of the present invention;
FIG. 3 is a schematic view of the intake and exhaust assemblies of the present invention in cooperation with a camshaft;
FIG. 4 is a cross-sectional view of the present invention 1;
FIG. 5 is a cross-sectional view of the present invention 2;
FIG. 6 is a cross-sectional view of a first bearing of the present invention;
FIG. 7 is a schematic view of the bearing press plate of the present invention in cooperation with an intake rocker shaft and an exhaust rocker shaft;
FIG. 8 is a schematic view of the relief mechanism of the present invention in cooperation with an exhaust rocker shaft and a camshaft;
description of reference numerals:
a cylinder head 1, a first support seat 11, a bearing hole 111, a pressure plate groove 112, a screw hole 113, a first support hole 114, a second support hole 115, a first communication port 116, a second communication port 117, an arc-shaped limit groove 118, a second support seat 12, a bearing groove 121, a first support groove 122, a second support groove 123,
the camshaft 2, the first end 201, the second end 202, the intake cam 21, the exhaust cam 22,
the camshaft mounting component 3, the first bearing 31, the ring groove 311, the ball groove 312, the second bearing 32, the bearing pressure plate 33, the insert tongue 331, the through hole 332, the first limiting piece 333, the second limiting piece 334, the connecting piece 335, the connecting piece 34,
the timing sprocket 4, the sprocket flange 41,
the intake assembly 5, the intake rocker shaft 51, the rotation stop 511, the intake rocker arm 52, the intake valve 53,
the exhaust assembly 6, the exhaust rocker shaft 61, the rotation limiting port 611, the exhaust rocker arm 62, the exhaust valve 63,
the pressure reducing mechanism 7, the one-way clutch 71, the ejector 72, and the return tension spring 73.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
As shown in fig. 1 to 8, the present invention discloses a miniaturized engine cylinder head, which comprises a cylinder head 1, a camshaft 2, a camshaft mounting assembly 3, a timing sprocket 4, an intake assembly 5 and an exhaust assembly 6; the camshaft 2 is arranged on the cylinder head 1 through the camshaft mounting assembly 3, the timing chain wheel 4 is arranged on the camshaft 2, the air inlet assembly 5 and the air outlet assembly 6 are respectively arranged on two sides of the camshaft 2, and the air inlet assembly 5 and the air outlet assembly 6 are in linkage fit with the camshaft 2, so that the air inlet assembly 5 and the air outlet assembly 6 perform air inlet and air outlet actions along with the rotation of the camshaft 2.
As shown in fig. 1 to 5, the cylinder head 1 is provided with a first support seat 11 and a second support seat 12 which are oppositely arranged along the axial direction of the cylinder head 1; the first support seat 11 is provided with a bearing hole 111 and a pressure plate groove 112, the first bearing hole 111 is axially communicated along the cylinder head 1, and the pressure plate groove 112 is arranged on one axial end face of the first support seat 11 along the axial direction of the cylinder head 1; the second support seat 12 is provided with a bearing groove 121 opposite to the bearing hole 111, and the opening of the bearing groove 121 faces the first support seat 11; the two axial ends of the camshaft 2 are divided into a first end 201 and a second end 202, an intake cam 21 and an exhaust cam 22 which are positioned between the first end 201 and the second end 202 are matched on the camshaft 2, and the intake cam 21 and the exhaust cam 22 are respectively in linkage fit with the intake component 5 and the exhaust component 6; the camshaft mounting assembly 3 comprises a first bearing 31, a second bearing 32 and a bearing pressure plate 33; the inner ring of the first bearing 31 is in interference fit with the first end 201 of the camshaft 2, the first bearing 31 penetrates through the bearing hole 111, the outer wall of the outer ring of the first bearing 31 is provided with a ring groove 311, the inner ring of the second bearing 32 is in interference fit with the second end 202 of the camshaft 2, and the second bearing 32 is embedded in the bearing groove 121; the bearing pressing plate 33 is embedded in the pressing plate groove 112 and fixedly connected with the first supporting seat 11 through the connecting piece 34, and the bearing pressing plate 33 is provided with a latch 331 inserted into the annular groove 311 of the first bearing 31 to position the first bearing 31. Because the bearing pressure plate 33 is embedded in the pressure plate groove 112 of the axial end face of the first support seat 11, and the inserting tongue 331 of the bearing pressure plate 22 is inserted into the annular groove 311 of the outer ring of the first bearing 31, the first support seat 11, the first bearing 31 and the bearing pressure plate 33 have an overlapping area in the axial direction of the cylinder head 1, and further the axial space occupation of the first support seat 11, the first bearing 31 and the bearing pressure plate 33 on the cylinder head 1 can be reduced, thereby being beneficial to reducing the axial size of the invention and ensuring that the axial size of the invention is small. It should be noted here that the existing bearing is a standard component, and the existing bearing has a strength standard requirement, so that the outer wall of the outer ring of the existing bearing is not provided with a ring groove; the annular groove 311 is formed in the outer wall of the outer ring of the first bearing 31, which is an innovative point of the present invention, and the annular groove 311 is formed in the outer wall of the outer ring of the first bearing 31, which is helpful for reducing the axial size of the present invention; in addition, in order to ensure the strength of the outer ring of the first bearing 31, as shown in fig. 6, the ring groove 331 and the ball groove 312 for accommodating balls on the inner wall of the outer ring of the first bearing 31 are completely arranged in a staggered manner, so that an area with too thin wall thickness on the outer ring of the first bearing 31 can be avoided, and the strength of the outer ring of the first bearing 31 is ensured.
As shown in fig. 1 and fig. 2, a bolt hole 113 is formed in the pressure plate groove 112 of the first support seat 11, a through hole 332 is formed in the bearing pressure plate 33 corresponding to the bolt hole 113, and the connecting member 34 is a connecting bolt passing through the through hole 332 and then screwed into the bolt hole 113, and a head of the connecting bolt may be partially located in the pressure plate groove 112, so as to reduce occupation of an axial space of the cylinder head 1 by the head of the connecting bolt.
As shown in fig. 1, the timing sprocket 4 is connected to a first end 201 of the camshaft 2, the timing sprocket 4 is located on a side of the first support seat 11 away from the second support seat 12, and the timing sprocket 4 is used for being in transmission fit with a crankshaft, so that the camshaft 2 is driven to rotate by the crankshaft; the timing chain wheel 4 can be connected with the first end 201 of the camshaft 2 through a chain wheel flange 41, the chain wheel flange 41 is fixed on the first end 201 of the camshaft 2, the camshaft 2 is sleeved with the timing chain wheel 4, and the timing chain wheel 4 is fixedly connected with the chain wheel flange 41 through bolts.
As shown in fig. 1 to 5, the intake assembly 5 and the exhaust assembly 6 are respectively located at two radial sides of the camshaft 2, and the intake assembly 5 and the exhaust assembly 6 are respectively in linkage fit with the intake cam 21 and the exhaust cam 22. Specifically, the intake assembly 5 comprises an intake rocker shaft 51, an intake rocker 52 and an intake valve 53, the intake rocker shaft 51 is parallel to the camshaft 2, two ends of the intake rocker shaft 51 are respectively connected with the first support seat 11 and the second support seat 12, the intake rocker 52 is rotatably sleeved on the intake rocker shaft 51 and is in linkage fit with the intake valve 53, and the intake valve 53 is movably matched on the cylinder head 1; the exhaust assembly 6 comprises an exhaust rocker shaft 61, an exhaust rocker arm 62 and an exhaust valve 63, the exhaust rocker shaft 61 is parallel to the camshaft 2, two ends of the exhaust rocker shaft 61 are respectively connected with the first supporting seat 11 and the second supporting seat 12, the exhaust rocker arm 62 is rotatably sleeved on the exhaust rocker shaft 61 and is in linkage fit with the exhaust valve 63, and the exhaust valve 63 is movably matched on the cylinder head 1; the intake cam 21 and the exhaust cam 22 are respectively in linkage fit with the intake rocker arm 52 and the exhaust rocker arm 62, so that the intake rocker arm 52 and the exhaust rocker arm 52 are driven to act when the camshaft 2 rotates in the forward direction, and further the intake valve 53 and the exhaust valve 63 act, so that intake and exhaust actions are alternately carried out. The specific structure of the intake cam 21 and the exhaust cam 22 in linkage with the intake rocker arm 52 and the exhaust rocker arm 62, respectively, is the prior art, and will not be described herein.
As shown in fig. 1 and 7, the first support seat 11 is provided with a first support hole 114 and a second support hole 115, the second support seat 12 is provided with a first support groove 122 and a second support groove 123, the intake rocker shaft 51 and the exhaust rocker shaft 61 respectively pass through the first support hole 114 and the second support hole 115, and the intake rocker shaft 51 and the exhaust rocker shaft 61 are respectively inserted into the first support groove 122 and the second support groove 123; the intake rocker shaft 51 and the exhaust rocker shaft 61 are respectively provided with a rotation stopping port 511 and a rotation limiting port 611; the bearing pressure plate 33 is provided at both ends thereof with a first stopper 333 and a second stopper 334, respectively, the first stopper 333 being inserted into the rotation stop opening 511 to restrict the rotation of the intake rocker shaft 51, and the second stopper 334 being inserted into the rotation restriction opening 611 to restrict the rotation of the exhaust rocker shaft 61. As shown in fig. 1, the first support seat 11 is provided with a first communication port 116 communicating with the pressure plate groove 112 and the first support hole 114, and a second communication port 117 communicating with the pressure plate groove 112 and the second support hole 115, and the first limiting piece 333 and the second limiting piece 334 of the bearing pressure plate 33 respectively pass through the first communication port 116 and the second communication port 117, so that an overlapping region exists between the first limiting piece 333 and the second limiting piece 334 and the first support seat 11 in the axial direction of the cylinder head 1, and the axial space occupation of the first limiting piece 333 and the second limiting piece 334 on the cylinder head 1 can be reduced, thereby contributing to reducing the axial size of the present invention.
As shown in fig. 1, 2, 5, and 8, the present invention further includes a pressure reducing mechanism 7; the pressure reducing mechanism 7 comprises a one-way clutch 71, an ejector 72 and a reset tension spring 73; the one-way clutch 71 is sleeved on the camshaft 2, the ejector 72 is rotatably sleeved on the exhaust rocker shaft 61, and the ejector 72 movably abuts against the one-way clutch 71 and the exhaust rocker 62; two ends of the reset tension spring 73 are respectively connected with the bearing plate 33 and the ejecting piece 72, and the reset tension spring 73 is used for providing restoring force for the ejecting piece 72; when the camshaft 2 rotates forwards, the camshaft 2 cannot drive the one-way clutch 71 to rotate synchronously; when the camshaft 2 rotates reversely, the camshaft 2 drives the one-way clutch 71 to rotate synchronously, the one-way clutch 71 pushes the exhaust rocker arm 62 through the pushing piece 72, and then the exhaust valve 63 is driven to open a small stroke for exhausting, so that the decompression operation is realized, and the problem that large starting impedance needs to be overcome when the engine is restarted after flameout is avoided. As shown in fig. 2, the return tension spring 73 of the pressure reducing mechanism 7 is arranged in a direction perpendicular to the axial direction of the cylinder head 1, so that the axial space occupation of the return tension spring 73 on the cylinder head 1 can be reduced, thereby contributing to the reduction of the axial size of the present invention; the top of the first supporting seat 11 is provided with an arc-shaped limiting groove 118, the reset tension spring 73 is arranged in the arc-shaped limiting groove 118, and the arc-shaped limiting groove 118 limits the reset tension spring 73, so that the reset tension spring 73 is prevented from generating extra resonance or displacement due to the operation of an engine.
As shown in fig. 5, the ejector 72 of the pressure reducing mechanism 7 may be located between the first support seat 11 and the second support seat 12, the bearing pressing plate 33 is located on a side of the first support seat 11 away from the second support seat 12, the upper portion of the bearing pressing plate 33 is bent toward the second support seat 12 to form a connecting piece 335, and two ends of the return tension spring 73 are respectively connected to the connecting piece 335 and the ejector 72, so that the return tension spring 73 may be disposed along a direction perpendicular to the axial direction of the cylinder head 1. The one-way clutch 71 of the decompression mechanism 7 is also located between the first support base 11 and the second support base 12.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (10)
1. A miniaturized engine cylinder head characterized by: the device comprises a cylinder head, a camshaft mounting assembly, a timing chain wheel, an air inlet assembly and an exhaust assembly;
the cylinder head is provided with a first supporting seat and a second supporting seat which are oppositely arranged along the axial direction of the cylinder head; the first support seat is provided with a bearing hole and a pressure plate groove, the first bearing hole is axially communicated along the cylinder head, and the pressure plate groove is arranged on one axial end face of the first support seat; the second supporting seat is provided with a bearing groove opposite to the bearing hole, and the opening of the bearing groove faces the first supporting seat;
the axial two ends of the camshaft are divided into a first end and a second end, and an air inlet cam and an air outlet cam which are positioned between the first end and the second end are matched on the camshaft;
the camshaft mounting assembly comprises a first bearing, a second bearing and a bearing pressure plate; the inner ring of the first bearing is in interference fit with the first end of the camshaft, the first bearing penetrates through the bearing hole, the outer wall of the outer ring of the first bearing is provided with a ring groove, the inner ring of the second bearing is in interference fit with the second end of the camshaft, and the second bearing is embedded in the bearing groove; the bearing pressing plate is embedded in the pressing plate groove and is fixedly connected with the first supporting seat through a connecting piece, and the bearing pressing plate is provided with an inserting tongue inserted into the first bearing ring groove;
the timing chain wheel is connected with the first end of the camshaft and is positioned on one side, far away from the second supporting seat, of the first supporting seat;
the air inlet assembly and the air exhaust assembly are respectively positioned on two radial sides of the camshaft, and are respectively in linkage fit with the air inlet cam and the air exhaust cam.
2. A miniaturized engine cylinder head as defined in claim 1, wherein: and the ring groove of the first bearing outer ring and the ball groove of the inner wall of the first bearing outer ring are completely arranged in a staggered manner.
3. A miniaturized engine cylinder head as defined in claim 1, wherein: the air inlet assembly comprises an air inlet rocker shaft, an air inlet rocker arm and an air inlet valve, the air inlet rocker shaft is parallel to the camshaft, two ends of the air inlet rocker shaft are respectively connected with the first supporting seat and the second supporting seat, the air inlet rocker arm is rotatably sleeved on the air inlet rocker shaft and is in linkage fit with the air inlet valve, and the air inlet valve is movably matched on the cylinder head;
the exhaust assembly comprises an exhaust rocker shaft, an exhaust rocker arm and an exhaust valve, the exhaust rocker shaft is parallel to the camshaft, two ends of the exhaust rocker shaft are respectively connected with the first supporting seat and the second supporting seat, the exhaust rocker arm is rotatably sleeved on the exhaust rocker shaft and is in linkage fit with the exhaust valve, and the exhaust valve is movably fitted on the cylinder head;
and the intake cam and the exhaust cam are respectively in linkage fit with the intake rocker arm and the exhaust rocker arm.
4. A miniaturized engine cylinder head as defined in claim 3, wherein: the first support seat is provided with a first support hole and a second support hole, the second support seat is provided with a first support groove and a second support groove, the air inlet rocker shaft and the air exhaust rocker shaft respectively penetrate through the first support hole and the second support hole, and the air inlet rocker shaft and the air exhaust rocker shaft are respectively inserted into the first support groove and the second support groove.
5. A miniaturized engine cylinder head according to claim 4, characterized in that: the air inlet rocker arm shaft and the air exhaust rocker arm shaft are respectively provided with a rotation stopping port and a rotation limiting port; the bearing pressure plate is provided with a first limiting piece and a second limiting piece at two ends respectively, the first limiting piece is inserted into the rotation stopping port to limit the rotation of the air inlet rocker shaft, and the second limiting piece is inserted into the rotation limiting port to limit the rotation of the exhaust rocker shaft.
6. A miniaturized engine cylinder head as defined in claim 5, characterized in that: the first supporting seat is provided with a first communicating hole communicated with the pressure plate groove and the first supporting hole and a second communicating hole communicated with the pressure plate groove and the second supporting hole, and the first limiting piece and the second limiting piece of the bearing pressure plate respectively penetrate through the first communicating hole and the second communicating hole.
7. A miniaturized engine cylinder head as defined in claim 3, wherein: the device also comprises a pressure reducing mechanism; the pressure reducing mechanism comprises a one-way clutch, an ejector piece and a reset tension spring; the one-way clutch is sleeved on the camshaft, the ejector is rotatably sleeved on the exhaust rocker shaft, and the ejector movably abuts against the one-way clutch and the exhaust rocker; the reset tension spring is arranged along the direction perpendicular to the axial direction of the cylinder head, and two ends of the reset tension spring are respectively connected with the bearing plate and the ejection piece.
8. A miniaturized engine cylinder head as defined in claim 7, wherein: the ejection piece is arranged between the first supporting seat and the second supporting seat, the bearing pressing plate is arranged on one side, away from the second supporting seat, of the first supporting seat, the upper portion of the bearing pressing plate is bent towards the second supporting seat to form a connecting sheet, and the two ends of the reset tension spring are respectively connected with the connecting sheet and the ejection piece.
9. A miniaturized engine cylinder head as defined in claim 7 or 8, characterized in that: the top of the first supporting seat is provided with an arc-shaped limiting groove, and the reset tension spring is arranged in the arc-shaped limiting groove.
10. A miniaturized engine cylinder head as defined in claim 1, wherein: a screw hole is formed in a pressure plate groove of the first support seat, and a through hole is formed in the bearing pressure plate corresponding to the screw hole; the connecting piece is a connecting bolt which penetrates through the through hole and is in threaded connection with the screw hole, and the head part of the connecting bolt is positioned in the pressure plate groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011104065.2A CN112177790B (en) | 2020-10-15 | 2020-10-15 | Cylinder head of miniaturized engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011104065.2A CN112177790B (en) | 2020-10-15 | 2020-10-15 | Cylinder head of miniaturized engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112177790A true CN112177790A (en) | 2021-01-05 |
| CN112177790B CN112177790B (en) | 2024-10-15 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5060605A (en) * | 1989-06-26 | 1991-10-29 | Isuzu Motors Limited | Valve drive mechanism for vehicle engine |
| US5605077A (en) * | 1994-09-30 | 1997-02-25 | Honda Giken Kogyo Kabushiki Kaisha | Camshaft supporting structure in an engine |
| EP1403497A1 (en) * | 2002-09-30 | 2004-03-31 | Honda Giken Kogyo Kabushiki Kaisha | Camshaft bearing structure for over-head camshaft type internal combustion engine |
| CN101128677A (en) * | 2005-03-11 | 2008-02-20 | 株式会社捷太格特 | Rolling bearing, camshaft device, and camshaft supporting device |
| CN203022835U (en) * | 2013-01-15 | 2013-06-26 | 三阳工业股份有限公司 | Valve actuation device for engine |
| CN204402602U (en) * | 2015-01-08 | 2015-06-17 | 翁光敏 | A kind of camshaft assembly with reduction valve |
| CN204436507U (en) * | 2015-01-22 | 2015-07-01 | 三阳工业股份有限公司 | The engine of tool decompressor |
| CN213450613U (en) * | 2020-10-15 | 2021-06-15 | 厦门厦杏摩托有限公司 | Small engine cylinder head |
-
2020
- 2020-10-15 CN CN202011104065.2A patent/CN112177790B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5060605A (en) * | 1989-06-26 | 1991-10-29 | Isuzu Motors Limited | Valve drive mechanism for vehicle engine |
| US5605077A (en) * | 1994-09-30 | 1997-02-25 | Honda Giken Kogyo Kabushiki Kaisha | Camshaft supporting structure in an engine |
| EP1403497A1 (en) * | 2002-09-30 | 2004-03-31 | Honda Giken Kogyo Kabushiki Kaisha | Camshaft bearing structure for over-head camshaft type internal combustion engine |
| CN101128677A (en) * | 2005-03-11 | 2008-02-20 | 株式会社捷太格特 | Rolling bearing, camshaft device, and camshaft supporting device |
| CN203022835U (en) * | 2013-01-15 | 2013-06-26 | 三阳工业股份有限公司 | Valve actuation device for engine |
| CN204402602U (en) * | 2015-01-08 | 2015-06-17 | 翁光敏 | A kind of camshaft assembly with reduction valve |
| CN204436507U (en) * | 2015-01-22 | 2015-07-01 | 三阳工业股份有限公司 | The engine of tool decompressor |
| CN213450613U (en) * | 2020-10-15 | 2021-06-15 | 厦门厦杏摩托有限公司 | Small engine cylinder head |
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|---|---|
| CN112177790B (en) | 2024-10-15 |
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