CN104329134A - Gas distribution mechanism of general engine - Google Patents

Gas distribution mechanism of general engine Download PDF

Info

Publication number
CN104329134A
CN104329134A CN201410622982.8A CN201410622982A CN104329134A CN 104329134 A CN104329134 A CN 104329134A CN 201410622982 A CN201410622982 A CN 201410622982A CN 104329134 A CN104329134 A CN 104329134A
Authority
CN
China
Prior art keywords
cam
camshaft
rocking arm
valve
intake valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410622982.8A
Other languages
Chinese (zh)
Inventor
莫启雄
罗雄彬
张学义
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHONGQING DINKING POWER MACHINERY Co Ltd
Original Assignee
CHONGQING DINKING POWER MACHINERY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHONGQING DINKING POWER MACHINERY Co Ltd filed Critical CHONGQING DINKING POWER MACHINERY Co Ltd
Priority to CN201410622982.8A priority Critical patent/CN104329134A/en
Publication of CN104329134A publication Critical patent/CN104329134A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
    • 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
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/348—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear by means acting on timing belts or chains
    • 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
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The invention relates to a circulating operation valve for a general engine, in particular to a gas distribution mechanism of the general engine. The gas distribution mechanism of the general engine comprises a camshaft, cams, rocker arms, an intake valve and an exhaust valve, wherein a timing gear is arranged on each of the camshaft and a crankshaft; a chain for connecting the two timing gears is arranged between the camshaft and the crankshaft; the two cams are arranged on the camshaft along the axial direction; the intake valve and the exhaust valve are positioned on two sides of the camshaft; one of the rocker arms is arranged between the intake valve and one of the cams, and the other rocker arm is arranged between the exhaust valve and the other cam; the middle part of each rocker arm is hinged to a box body; two ends of each rocker arm abut against the surface of the corresponding cam and the end part of the corresponding valve respectively. With the gas distribution mechanism of the general engine, the rocker arms are directly driven by the cams, so that the problems that the contact position between a push rod and each rocker arm is easy to disengage and the requirements on the push rod are high are avoided; in addition, the structure is simple.

Description

Logical machine distribution device
Technical field
The present invention relates to a kind of cyclically operating valve of logical machine motor, be specifically related to a kind of logical machine distribution device.
Background technique
General small-size gasoline engine is a kind of power-driven tool equipment, and be called for short logical machine, refer to the petrol engine except automobile-used and specific use, its nominal power is generally at below 30kW.It is mainly as the supporting power of agricultural equipment for plant protection, small farm machine, graden machine, generator set, building machinery, outboard machinery etc.Because general small-size gasoline engine volume is little, lightweight, low price, easy to use, so occupy critical positions in various machine coordination.Particularly among backpack machinery, the supporting power that general small-size gasoline engine is unique especially.General small-size gasoline engine forms the same with general internal-combustion engine, has basic structural system, is also made up of some basic similar component.General small-size gasoline engine mainly comprises following seven major parts: crankshaft rod system, airframe systems, oil-fired system, cooling system, lubrication system, gas distribution system and ignition system.
For four-stroke general small-size gasoline engine, its gas distribution system generally comprises the compositions such as inlet and outlet door, rocking arm, push rod, tappet and camshaft, rotated by camshaft band moving cam, the tappet of cam promotion simultaneously moves vertically, tappet promotes push rod, finally promote rocking arm by push rod again, drive valve to open and close by rocking arm.The shortcoming of the structure of this distribution is that 1. push rod frequently promotes rocking arm, and especially at high speed, push rod and rocking arm contact position easily come off, and to push rod emphasize require high; 2. complicated structure.
Summary of the invention
For the defect that above-mentioned prior art exists, the object of the present invention is to provide a kind of by cam Direct driver rocking arm, and the simply logical machine distribution device of structure.
For achieving the above object, technological scheme of the present invention is: logical machine distribution device, comprise camshaft, cam, rocking arm, intake valve and exhaust valve, described camshaft and bent axle are equipped with timing gear, the chain of two timing gear is connected between camshaft with bent axle, wherein, described camshaft is provided with two cams vertically, described intake valve, exhaust valve is positioned at camshaft both sides, between intake valve and a cam, the rocking arm on casing is articulated with in the middle part of being equipped with between exhaust valve and another cam, rocking arm two ends respectively with corresponding cam face, the end of corresponding valve offsets.
When adopting technique scheme, gasoline combustion in the cylinder of logical machine, thus promotion piston moves in cylinder, piston is drivening rod then, connecting rod then drives crank rotation, due to camshaft and bent axle being equipped with timing gear, the chain of two timing gear is connected between camshaft with bent axle, so camshaft rotates under the drive of bent axle, be positioned at two cams on camshaft with cam axle, again because rocking arm two ends respectively with corresponding cam face, the end of corresponding valve offsets, when cam rotates, when the side that the degree of eccentricity is large goes to and contacts with rocking arm, the articulating point of rocking arm around middle part rotates, the rocking arm the other end promotes the end of intake valve or exhaust valve, by corresponding for cylinder suction port or exhaust close.In the present invention, cam on camshaft directly acts on rocking arm, by rocker arm displaces intake valve or exhaust valve closing, compared with existing structure, structure obviously becomes simpler, eliminate tappet, push rod, so also just there is not push rod and rocking arm contact position easily comes off, push rod requires high problem.
Further, the side of described rocking arm and intake valve or exhaust valve ends contact is sphere.Hinged with casing in the middle part of rocking arm, one end and cam offset, the end of the other end and valve offsets, when cam promotes rocking arm swing, position and the valve end of the other end and valve ends contact can relatively rotate; the side of rocking arm and intake valve or exhaust valve ends contact is sphere; then rocking arm is in the process of promotion valve end, very steadily.
Further, described rocking arm and cam face offset the edge of one end towards tilting away from cam side.One end offsets with cam all the time, in cam rotation process, when particularly rocking arm goes to the large side of cam eccentric degree from the side that cam eccentric degree is little, rocking arm and cam face offset the edge of one end towards when tilting away from cam side, then rocking arm and cam can not produce interference.
Further, described cam and camshaft are that one is connected.Rocking arm continually with cam friction, cam applies the power of tangent direction, and cam is connected with integrated camshaft just can ensure that cam is highly stable.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is the structural representation that machine distribution device embodiment is led in the present invention;
Fig. 2 is the structural representation that machine distribution device embodiment is led in the present invention;
Fig. 3 is the explosive view that machine distribution device embodiment convexity wheel shaft, cam, rocking arm, intake valve and exhaust valve part are led in the present invention.
Embodiment
In the present embodiment, reference character is respectively: camshaft 1, rocking arm 2, cam 3, timing gear 4, intake valve 5, exhaust valve 6, bent axle 7.
As depicted in figs. 1 and 2, a kind of logical machine distribution device, comprise camshaft 1, cam 3, rocking arm 2, intake valve 5 and exhaust valve 6, camshaft 1 and bent axle 7 are equipped with timing gear 4, the chain of two timing gear 4 is connected between camshaft 1 with bent axle 7, wherein, camshaft 1 is provided with two cams 3 vertically, intake valve 5, exhaust valve 6 is positioned at camshaft 1 both sides, between intake valve 5 and a cam 3, the rocking arm 2 on casing is articulated with in the middle part of being equipped with between exhaust valve 6 and another cam 3, rocking arm 2 two ends are surperficial with corresponding cam 3 respectively, the end of corresponding valve offsets.
In the present embodiment, as Fig. 3, rocking arm 2 is sphere with the side of intake valve 5 or exhaust valve 6 ends contact.Hinged with casing in the middle part of rocking arm 2, one end and cam 3 offset, the end of the other end and valve offsets, when cam 3 promote rocking arm 2 swing time, position and the valve end of the other end and valve ends contact can relatively rotate; rocking arm 2 is sphere with the side of intake valve 5 or exhaust valve 6 ends contact; then rocking arm 2 is in the process of promotion valve end, very steadily.
Rocking arm 2 and cam 3 surface offset the edge of one end towards tilting away from cam 3 side.Rocking arm 2 one end offsets with cam 3 all the time, in cam 3 rotation process, when particularly rocking arm 2 goes to the large side of cam 3 degree of eccentricity from the side that cam 3 degree of eccentricity is little; rocking arm 2 and cam 3 surface offset the edge of one end towards when tilting away from cam 3 side, then rocking arm 2 and cam 3 can not produce interference.
Cam 3 and camshaft 1 are that one is connected.Rocking arm 2 rubs with cam 3 continually, and cam 3 applies the power of tangent direction, and cam 3 is connected with camshaft 1 one just can ensure that cam 3 is highly stable.
Specific works principle:
As shown in Figure 1, gasoline combustion in the cylinder of logical machine, thus promotion piston moves in cylinder, piston is drivening rod then, connecting rod is then with dynamic crankshaft 7 to rotate, due to camshaft 1 and bent axle 7 being equipped with timing gear 4, the chain of two timing gear 4 is connected between camshaft 1 with bent axle 7, so camshaft 1 rotates under the drive of bent axle 7, two cams 3 be positioned on camshaft 1 rotate with camshaft 1, again because rocking arm 2 two ends are surperficial with corresponding cam 3 respectively, the end of corresponding valve offsets, when cam 3 rotates, when the side that the degree of eccentricity is large goes to and contacts with rocking arm 2, the articulating point of rocking arm 2 around middle part rotates, rocking arm 2 the other end promotes the end of intake valve 5 or exhaust valve 6, by corresponding for cylinder suction port or exhaust close.
Above-described is only the preferred embodiment of the present invention; should be understood that; for a person skilled in the art; under the prerequisite not departing from structure of the present invention; some distortion and improvement can also be made; these also should be considered as protection scope of the present invention, and these all can not affect effect of the invention process and practical applicability.

Claims (4)

1. logical machine distribution device, comprise camshaft, cam, rocking arm, intake valve and exhaust valve, described camshaft and bent axle are equipped with timing gear, the chain of two timing gear is connected between camshaft with bent axle, it is characterized in that, described camshaft is provided with two cams vertically, described intake valve, exhaust valve are positioned at camshaft both sides, between intake valve and a cam, be articulated with the rocking arm on casing in the middle part of being equipped with between exhaust valve and another cam, rocking arm two ends offset with the end of corresponding cam face, corresponding valve respectively.
2. logical machine distribution device according to claim 1, is characterized in that, the side of described rocking arm and intake valve or exhaust valve ends contact is sphere.
3. logical machine distribution device according to claim 1, is characterized in that, described rocking arm and cam face offset the edge of one end towards tilting away from cam side.
4. logical machine distribution device according to claim 1, is characterized in that, described cam and camshaft are that one is connected.
CN201410622982.8A 2014-11-09 2014-11-09 Gas distribution mechanism of general engine Pending CN104329134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410622982.8A CN104329134A (en) 2014-11-09 2014-11-09 Gas distribution mechanism of general engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410622982.8A CN104329134A (en) 2014-11-09 2014-11-09 Gas distribution mechanism of general engine

Publications (1)

Publication Number Publication Date
CN104329134A true CN104329134A (en) 2015-02-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105221198A (en) * 2015-11-05 2016-01-06 重庆驰龙摩托车配件有限公司 A kind of motorcycle engine double-cam distribution device
CN115434778A (en) * 2022-10-14 2022-12-06 福建永强力加动力设备有限公司 Novel camshaft

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2227025A1 (en) * 1998-03-20 1999-09-20 Nicholas M. Ottlyk Attain's new camshaft locations, or "ancam-l"
CN101245717A (en) * 2007-02-13 2008-08-20 雅马哈发动机株式会社 Four-stroke internal-combustion engine
JP4191538B2 (en) * 2003-06-04 2008-12-03 本田技研工業株式会社 Engine valve gear
CN201554507U (en) * 2009-10-30 2010-08-18 重庆宗申发动机制造有限公司 Down-set cam valve actuating mechanism and engine with same
CN102817659A (en) * 2011-08-29 2012-12-12 摩尔动力(北京)技术股份有限公司 Crank cam valve actuating mechanism
CN102953776A (en) * 2011-08-22 2013-03-06 江苏林海动力机械集团公司 Cam valve train of engine
CN203114368U (en) * 2012-05-18 2013-08-07 奇瑞汽车股份有限公司 Mechanical tappet for measuring valve stroke
CN103277209A (en) * 2013-06-08 2013-09-04 清华大学 Crossed-airway cylinder cover assembly structure of single cylinder engine
CN204200293U (en) * 2014-11-09 2015-03-11 重庆鼎工机电有限公司 Logical machine distribution device
CN205936725U (en) * 2016-07-14 2017-02-08 阿尔特汽车技术股份有限公司 Cooperation structure of valve stem and rocking arm

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2227025A1 (en) * 1998-03-20 1999-09-20 Nicholas M. Ottlyk Attain's new camshaft locations, or "ancam-l"
JP4191538B2 (en) * 2003-06-04 2008-12-03 本田技研工業株式会社 Engine valve gear
CN101245717A (en) * 2007-02-13 2008-08-20 雅马哈发动机株式会社 Four-stroke internal-combustion engine
CN201554507U (en) * 2009-10-30 2010-08-18 重庆宗申发动机制造有限公司 Down-set cam valve actuating mechanism and engine with same
CN102953776A (en) * 2011-08-22 2013-03-06 江苏林海动力机械集团公司 Cam valve train of engine
CN102817659A (en) * 2011-08-29 2012-12-12 摩尔动力(北京)技术股份有限公司 Crank cam valve actuating mechanism
CN203114368U (en) * 2012-05-18 2013-08-07 奇瑞汽车股份有限公司 Mechanical tappet for measuring valve stroke
CN103277209A (en) * 2013-06-08 2013-09-04 清华大学 Crossed-airway cylinder cover assembly structure of single cylinder engine
CN204200293U (en) * 2014-11-09 2015-03-11 重庆鼎工机电有限公司 Logical machine distribution device
CN205936725U (en) * 2016-07-14 2017-02-08 阿尔特汽车技术股份有限公司 Cooperation structure of valve stem and rocking arm

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105221198A (en) * 2015-11-05 2016-01-06 重庆驰龙摩托车配件有限公司 A kind of motorcycle engine double-cam distribution device
CN115434778A (en) * 2022-10-14 2022-12-06 福建永强力加动力设备有限公司 Novel camshaft

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Application publication date: 20150204