CN2878682Y

CN2878682Y - Lubricating structure for engine

Info

Publication number: CN2878682Y
Application number: CNU2006200699498U
Authority: CN
Inventors: 肖亨琳
Original assignee: Wuxi Kipor Power Co Ltd
Current assignee: Wuxi Kipor Power Co Ltd
Priority date: 2006-03-08
Filing date: 2006-03-08
Publication date: 2007-03-14
Anticipated expiration: 2016-03-08

Abstract

The utility model relates to a lubricating structure of engine, belonging to the dynamic equipment technology domain. The product is mainly composed with an engine box and a cylinder cover to form an integrated structure, wherein, the overhead cam driving mechanism is supported by a supporting shaft in an operation chamber, a sub valve operation system is installed in the operation chamber, a crankshaft support is arranged in the crankshaft box, a chain tensioning device is installed in the crankshaft box, a decompression device is arranged on one side of the overhead cam drive mechanism. The utility model has a simple, compact and reasonable structure, as an opening is arranged on the top of the engine body and an oil tank is arranged on the bottom of valve operation chamber, the product adopts an oil mist lubrication mode, a spattering lubrication mode and a spattering lubrication system to lubricate, meanwhile, can provide lubrication to the intake and exhaust cam and the driven chain wheel and the bearing shaft, so the product can provide lubricants evenly to various parts of the valve operating system, restrain heat produced by the driven chain wheel of the exhaust cam while rotating at high speed, ensure engine to work reliably and the contact part between the intake and exhaust cam and valve rocker arm to be lubricated fully.

Description

Lubricating structure of engine

Technical field

The utility model relates to a kind of lubricating structure of engine, specifically can evenly provide lubricant oil to the various piece of valve operating system, belongs to field of power equipment technology.

Background technique

Before the utility model is made, in prior art, lubricating structure of engine normally adopts cam overhead type mechanism, this structure has been cancelled parts such as tappet, push rod and has been adopted chain or toothed belt transmission, its advantage is that reciprocating part is few, cancelled tappet and push rod entire mechanism rigidity is big, during high speed because the vibrations minimum that reciprocation mass inertial force causes is suitable for the motor that runs up.But this kind structural disadvantages is that it is difficult to provide enough lubricating oil easily to cause parts wear, shortens working life between supporting axle and intake and exhaust cam and follower.

Chinese patent application number: 02104779.0 discloses in the described lubricating structure, supply with valve operating system by the lubricant oil that drivign belt carries in the crankcase, separate with this drivign belt around the action of centrifugal force at the part place of follower at drivign belt, like this collision of separated lubricating oil and splashed oil rib and atomizing.Owing to stopping of belt baffle plate on the follower and decompressor, cause the lubricant oil of supplying with intake and exhaust cam and valve rocker contact segment insufficient.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, thereby provide a kind of driven sprocket to drive and to rotate freely by crankshaft timing sprocket, the unlatching of control inlet and exhaust valve, chain wheel driving mechanism leads and tensioning to synchronous transmission device by chain automatic takeup in the crankcase; Automatically compensate the loosening and slippage phenomenon in the chain transmission process; Chain synchronous transmission device endoporus has oil groove, provide oil groove at this engine body upper opening in bottom, air door operation chamber, offer lubricating between intake and exhaust cam and driven sprocket and supporting axle when utilizing mist of oil form and splash-lubricating system, thereby lubricant oil evenly can be supplied with the lubricating structure of engine of valve operating system various piece.

Main solution of the present utility model is achieved in that

The utility model comprises the body 1 of motor, feature is that the body 1 of motor is formed integral structure by engine housing 1a, cylinder cap 1b, overhead cam driving mechanism 38 is bearing in the air door operation chamber 9 by supporting axle 8, and air door operation chamber 9 is formed between engine body 1 and the housing 2 that this engine body links to each other; The two supports of supporting axle 8 is in the axis hole 1c on cylinder cap 1b top, be provided with O-ring seal 39 at axis hole 1c and between centers, the exterior edge face of axle is a flat plane 40, flat plane 40 is pressed in the pressing plate 2a bottom of valve mechanism cover 2, air valve controlling system 6 is loaded in the air door operation chamber 9, bent axle 12 is by bearings at both ends 13,14 are bearing in the crankcase 15, lubricant oil 17 is housed in the crankcase 15, chain stretching device 18 is installed in the crankcase 15, air door operation chamber 9 endoporus have oil groove 36, and oil groove 36 two ends are opened in the air door operation chamber 9 simultaneously, are provided with oil groove 37 on cylinder cap 1b top, upper end open is in 9 bottoms, air door operation chamber, the bottom sealing, its oil groove 37 is communicated with oil groove 36, and overhead cam driving mechanism 38 1 sides are installed decompressor 41.

The utility model overhead cam driving mechanism 38 comprises crankshaft timing sprocket 3, driven sprocket 4, endless roller chain bar 5, intake and exhaust cam 7, supporting axle 8, bent axle 12, endless roller chain bar 5 is looped around on crankshaft timing sprocket 3 and the driven sprocket 4, intake and exhaust cam 7 is installed on the supporting axle 8, and crankshaft timing sprocket 3 is fixed on the bent axle 12.

The utility model air valve controlling system 6 comprises inlet valve rocker 10, exhaust valve rocker arm 11, and inlet valve rocker 10, exhaust valve rocker arm 11 are contained on the body 1 of motor.

The utility model chain stretching device 18 comprises chain supporting plate 19, chain pressing plate 20, tension spring 21, fixture block 22, spring pin 23, arc groove 24, re-entrant angle 25, dome arc 26, salient angle 27, driving channel 28, square hole 29, chain supporting plate 19 is fixed on the fixture block 22, chain supporting plate 19 is provided with arc groove 24 and re-entrant angle 25, arc groove 24 and re-entrant angle 25 are stuck on the dome arc 26 and salient angle 27 on the fixture block 22, its top is pierced in the driving channel 28C, chain pressing plate 20 is fixing by spring pin 23, tension spring pin 23 passes tension spring 21 and chain pressing plate 20 is fixed on the body 1, tension spring 21 1 end hooks advance in the square hole 29 of chain pressing plate 20, and the other end keeps off on block 30.

The utility model decompressor 41 comprises that decompression flies piece 42, relief spring 43, spring pin 44 and bearing pin 45, decompression flies piece 42 and is installed in overhead cam driving mechanism 38 axis holes 46, and in overhead cam driving mechanism axis hole 46, rotate, relief spring 43 is fixed on the overhead cam driving mechanism 38 by bearing pin 45, and spring pin 44 is fixed on the overhead cam driving mechanism 38.

Compared with the prior art the utility model has the following advantages:

The utility model is simple, compact and reasonable for structure; Because adopting engine body and cylinder cap is integral structure; Motor adopts the chain synchronous transmission device, and in body upper air door operation chamber, driven sprocket drives and can rotate freely by crankshaft timing sprocket the chain synchronous transmission device by a support shaft supports, the unlatching of control inlet and exhaust valve; Chain wheel driving mechanism leads and tensioning to synchronous transmission device by a chain automatic takeup in the crankcase; Automatically compensate the loosening and slippage phenomenon in the chain transmission process; Chain synchronous transmission device endoporus has oil groove, provide oil groove at this engine body upper opening and bottom, air door operation chamber, offer lubricating between intake and exhaust cam and driven sprocket and supporting axle when utilizing mist of oil form and splash-lubricating system, thereby lubricant oil evenly can be supplied with the various piece of valve operating system; The heat that suppresses intake and exhaust cam driven sprocket high speed rotating and produce, guarantee engine reliable work, this overhead cam driving mechanism also comprises decompressor simultaneously, and this decompressor is positioned at the valve rocker opposite side, has guaranteed the sufficient lubrication of intake and exhaust cam and valve rocker contact segment.

Description of drawings

Fig. 1 is the utility model structural front view:

Fig. 2 is the utility model structure A～A longitudinal sectional view.

Fig. 3 is the utility model structure B～B transverse sectional view.

Fig. 4 is the utility model overhead cam driving mechanism outline drawing.

Embodiment

Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:

The utility model is mainly by the body 1 of motor, engine housing 1a, cylinder cap 1b, axis hole 1c, housing 2, pressing plate 2a, crankshaft timing sprocket 3, driven sprocket 4, endless roller chain bar 5, valve operating system 6, intake and exhaust cam 7, supporting axle 8, air door operation chamber 9, inlet valve rocker 10, exhaust valve rocker arm 11, bent axle 12, bearing 13,14, crankcase 15, case lid 16, lubricant oil 17, chain stretching device 18, chain supporting plate 19, chain pressing plate 20, tension spring 21, fixture block 22, arc groove 24, re-entrant angle 25, dome arc 26, salient angle 27, driving channel 28, square hole 29, block 30, camber line 31, inlet and

exhaust valve

32,33, limit 34,35, oil groove 36,37, overhead cam driving mechanism 38, decompressor 41, decompression flies piece 42, relief spring 43, spring pin 44, bearing pin 45, axis hole 46 compositions such as grade.

The body 1 that mainly comprises four stroke engine in accompanying drawing 1-4, this body 1 are the structures of engine housing 1a, cylinder cap 1b integral type.Driven sprocket 4 is an integral structure with intake and exhaust cam 7.Overhead cam driving mechanism 38 comprises crankshaft timing sprocket 3, driven sprocket 4, endless roller chain bar 5, intake and exhaust cam 7, supporting axle 8, bent axle 12.Endless roller chain bar 5 is looped around on crankshaft timing sprocket 3 and the driven sprocket 4, and intake and exhaust cam 7 is contained on the supporting axle 8, and crankshaft timing sprocket 3 is fixed on the bent axle 12.This overhead cam driving mechanism 38 is by a supporting axle 8 rotatable being bearing in the air door operation chamber 9, this air door operation chamber 9 is to be combined by the cylinder cap 1b of motor and housing 2, the two supports of supporting axle 8 is in the axis hole 1c on cylinder cap 1b top, at support shaft holes 1c and between centers one O-ring seal 39 is arranged, the exterior edge face of supporting axle 8 is flat planes 40, this plane is pressed in the pressing plate 2a bottom of valve mechanism cover 2, thereby prevents that supporting axle 8 from self rotating.This air valve controlling system 6 comprises inlet valve rocker 10 and exhaust valve rocker arm 11, and inlet valve rocker 10 and exhaust valve rocker arm 11 are contained in respectively on the body 1 of motor.This bent axle 12 is by bearings at both ends 13,14 are bearing in the crankcase 15, be contained in through piston 47, connecting rod 48 on the body 1 of motor, in crankcase 15, can rotate freely, this crankcase 15 is combined by casing 1b and case lid 16, in this crankcase 15 lubricant oil 17 is housed, chain stretching device 18 is installed in the crankcase 15, and chain stretching device 18 comprises chain supporting plate 19, chain pressing plate 20, tension spring 21.This chain supporting plate 19 is fixed on the fixture block 22, and chain supporting plate 19 is provided with an arc groove 24 and a re-entrant angle 25, and arc groove 24 and this re-entrant angle 25 firmly are stuck on the dome arc 26 and a salient angle 27 on the fixture block 22, and its top is pierced in the driving channel 28; Chain pressing plate 20 is fixed by a tension spring pin 23 and can be freely swung, this tension spring pin 23 passes tension spring 21 and chain pressing plate 20 is fixed on the body 1, these tension spring 21 1 end hooks advance in the square hole 29 of chain pressing plate 20, and the other end keeps off on block 30.Intake and exhaust cam 7 is an integral structure with driven sprocket 4 in the air door operation chamber 9, and its endoporus has oil groove 36; These oil groove 36 two ends are opened in the air door operation chamber 9 simultaneously, on cylinder cap 1b top oil groove 37 are arranged, and upper end open is in bottom, air door operation chamber, and the bottom is sealed.Its oil groove 37 can be communicated with oil groove 36.Overhead cam driving mechanism 38 1 sides are equipped with decompressor 41, decompressor 41 comprises that decompression flies piece 42, relief spring 43, spring pin 44 and bearing pin 45, decompression flies piece 42 and is installed in overhead cam driving mechanism 38 axis holes 46, and can in overhead cam driving mechanism axis hole 46, freely rotate, relief spring 43 is fixed on the overhead cam driving mechanism 38 by bearing pin 45, and spring pin 44 is fixed on the overhead cam driving mechanism 38.

Working principle of the present utility model and working procedure:

Running of the present utility model is such, when engine crankshaft 12 when camber line 31 counterclockwise rotates, crankshaft timing sprocket 3 drives endless roller chain bar 5, be used for the rotary power of bent axle 12 being passed to driven sprocket 4 with 1: 2 velocity ratio, thereby drive intake and exhaust cam 7 along supporting axle 8 rotations, intake and

exhaust cam

7 and 10,11 sliding contacts of inlet and outlet door rocking arm, when intake and exhaust cam 7 rotations, thereby drive inlet valve rocker 10 and exhaust valve rocker arm 11 rotations, and then control inlet and

exhaust valve

32,33 is opened.When engine crankshaft 12 when camber line 31 counterclockwise rotates, one 34 limits of endless roller chain bar 5 are in tensioning state when moving, this limit play the guiding role by 19 pairs of chain supporting plates, another 35 lateral dominance promotes chain pressing plate 20 with the elastic force of tension spring 21, under tension spring 21 elastic force effects, chain pressing plate 20 limits are adjacent to 35 limits of endless roller chain bar 5 all the time.This structure not only can be carried out tensioning automatically to chain, prevent that chain from jumping tooth in transmission process, take off the tooth phenomenon, and can compensate automatically the elongation phenomenon of chain in the long-term operation process, adopt as built-in chain wheel driving mechanism and to regulate automatically and do not adopt and manually regulate, not only simply but also reliable, durable, be suitable for various rotating speed motors.When high engine speeds was rotated, lubricant oil 17 sticks on the endless roller chain bar 5 and with these endless roller chain bar 5 motions, endless roller chain bar 5 can be supplied with air door operation chamber 9 with the lubricating oil in the crankcase 15 17 simultaneously.Lubricating oil 17 parts enter synchronous chain oil groove with the mist of oil form, another part is splashed into lubricant oil in the air door operation chamber to dropping to air door operation chamber bottom through splash-lubricating system, fall through gravity and to enter these cam timing drive sprocket oil groove 36 endoporus of body oil groove 37 guiding, fall from oil groove 36 the other ends again, guarantee between a certain amount of lubricated supply intake and exhaust cam and driven sprocket and supporting axle the zone, thereby reduced the heat that produces owing to high speed rotating.Simultaneously when engine start, when this overhead cam driving mechanism 38 turns round in certain rotating speed, decompression fly piece 42 can be under the elastic force effect of relief spring 43 self-return open exhaust valve by exhaust valve rocker arm 10 motor played decompression.When high engine speeds turned round, decompression flew the elastic force that piece 42 can overcome relief spring 43, and under spring pin 44 position-limiting actions, makes the motor proper functioning.This decompressor is positioned at the valve rocker opposite side, has guaranteed the sufficient lubrication of intake and exhaust cam and valve rocker contact segment.

Generally speaking, as built-in automatic adjusting chain wheel driving mechanism, the utility model compact structure, self-regulation effect is good, has guaranteed enough lubrication effects again, and is reliable, durable.This practicality newly also can be widely used in any four stroke top cam engine.

Claims

1, a kind of lubricating structure of engine, the body (1), engine housing (1a), the cylinder cap (1b) that comprise motor, the body (1) that it is characterized in that motor is formed integral structure by engine housing (1a), cylinder cap (1b), overhead cam driving mechanism (38) is bearing in the air door operation chamber (9) by supporting axle (8), and air door operation chamber (9) are between the housing (2) that engine body (1) links to each other with this engine body; The two supports of supporting axle (8) is in the axis hole (1c) on cylinder cap (1b) top, be provided with O-ring seal (39) in support shaft holes (1c) and between centers, the exterior edge face of supporting axle (8) is a flat plane (40), flat plane (40) is pressed in pressing plate (2a) bottom of valve mechanism cover (2), air valve controlling system (6) is loaded in the air door operation chamber (9), bent axle (12) is by bearings at both ends (13,14) be bearing in the crankcase (15), lubricant oil (17) is housed in the crankcase (15), chain stretching device (18) is installed in the crankcase (15), air door operation chamber (9) endoporus has oil groove (36), oil groove (36) both ends open is in air door operation chamber (9), be provided with oil groove (37) on cylinder cap (1b) top, upper end open is in air door operation chamber (9) bottom, the bottom sealing, its oil groove (37) is communicated with oil groove (36), and overhead cam driving mechanism (38) one sides are installed decompressor (41).

2, lubricating structure of engine according to claim 1, it is characterized in that described air valve controlling system (6) comprises inlet valve rocker (10), exhaust valve rocker arm (11), inlet valve rocker (10), exhaust valve rocker arm (11) are contained in respectively on the engine body (1).

3, lubricating structure of engine according to claim 1, it is characterized in that described overhead cam driving mechanism (38) comprises crankshaft timing sprocket (3), driven sprocket (4), endless roller chain bar (5), intake and exhaust cam (7), supporting axle (8), bent axle (12), endless roller chain bar (5) is looped around on crankshaft timing sprocket (3) and the driven sprocket (4), intake and exhaust cam (7) is contained on the supporting axle (8), and crankshaft timing sprocket (3) is fixed on the bent axle (12).

4, lubricating structure of engine according to claim 1, it is characterized in that described chain stretching device (18) comprises chain supporting plate (19), chain pressing plate (20), tension spring (21), fixture block (22), spring pin (23), arc groove (24), re-entrant angle (25), dome arc (26), salient angle (27), driving channel (28), square hole (29), chain supporting plate (19) is fixed on the fixture block (22), chain supporting plate (19) is provided with arc groove (24) and re-entrant angle (25), arc groove (24) and re-entrant angle (25) are stuck on the dome arc (26) and salient angle (27) on the fixture block (22), its top is pierced in the driving channel (28), chain pressing plate (20) is fixing by spring pin (23), tension spring pin (23) passes tension spring (21) and chain pressing plate (20) is fixed on the body (1), tension spring (21) one end hooks advance in the square hole (29) of chain pressing plate (20), and the other end keeps off on block (30).

5, lubricating structure of engine according to claim 1, it is characterized in that described decompressor (41) comprises that decompression flies piece (42), relief spring (43), spring pin (44) and bearing pin (45), decompression flies piece (42) and is installed in overhead cam driving mechanism (38) axis hole (46), and in axis hole (46), rotate, relief spring (43) is fixed on the overhead cam driving mechanism (38) by bearing pin (45), spring pin (44).