CN201137506Y

CN201137506Y - Opposition type straight double-cylinder engine

Info

Publication number: CN201137506Y
Application number: CNU2007200415768U
Authority: CN
Inventors: 陈维加
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-11-23
Filing date: 2007-11-23
Publication date: 2008-10-22
Anticipated expiration: 2017-11-23

Abstract

The utility model discloses an opposed straight double cylinder engine, comprising two cylinders parallel in a cylinder head and a crank shaft in a crank shaft box, wherien the piston in the cylinder drives the crank shaft via a connecting rod, each cylinder is provided with an independent gas distributor, the two gas distributors are at the outer sides of the two cylinders and opposed relative to the joint faces of the two cylinders. The utility model has stable operation, low noise, simple structure, small volume and low production cost and resolves the problem of the prior art such as that the straight double cylinder engine is difficult to be made into small engine.

Description

The opposed type straight arrangement double-cylinder engine

Technical field

The utility model belongs to internal-combustion engine mechanical structure and improves technical field, is specifically related to a kind of opposed type straight arrangement double-cylinder engine.

Background technique

What be used for mini engine in the market mostly is single casing or two-cylinder type petrol engine.With the single-cylinder four-stroke engine is example, and its bent axle whenever takes two turns the ability work by combustion once, therefore, can feel significantly that the work of motor is interrupted, and the intermittence of exhaust sound is stronger.Under the same displacement condition, to compare with double cylinder engine, the movement parts inertial force of single-cylinder engine is difficult for cancelling each other, and therefore, aspect noise and vibration, the vibration of single casing motor is big, and during particularly high rotating speed, this problem shows particularly outstandingly.Double cylinder engine is because the quality of to-and-fro motion and rotation motion part is little in contrast, its inertial force is less relatively, and the outburst number of times of motor is the twice of single-cylinder engine, therefore, the Engine torque amplitude of fluctuation is little, vibration is little more many than single-cylinder engine, and exhaust sound also is starkly lower than single cylinder engine.

And representative in the market small capacity double Cylinder engine is the V-type twin cylinder engine, it all is designed to V-type with two cylinders and arranges, be about to two cylinders angle that staggers, make the air cooling effect of each cylinder be equal to single-cylinder air-cooled machine, but each cylinder operation circulation of four stroke engine is 720 °, two cylinders of V-type twin-tub machine stagger after the angle, be generally 90 °, then two cylinders are respectively 90 °～270 ° and 540 °～720 ° detonation works done, the angle of intersection is 270 ° and 450 °, so it is more not steady to work, and because the difference of the angle of intersection will cause the suction press difference as using a Carburetor, so just must use two Carburetors, and general Carburetor is difficult to guarantee at each angle fuel feeding, the unanimity of tolerance, need to solve by coupling or manufacturing twobarrel carburetor, this has also increased cost.

Compare the V-type twin cylinder engine, two cylinders of straight arrangement double-cylinder engine just in time are separated by 360 degree actings once, and therefore work is more steady, and noise is low; And eliminated V-type twin-tub machine as using a Carburetor because air inlet angle of intersection difference causes the different situation of suction press, owing to there is not phase difference, not only can save a Carburetor, it is much simple that annexes such as distribution device are wanted.And present water-cooled straight arrangement double-cylinder engine, the structural configuration mode is complicated: it designs cooling water tank outside motor, and have water channel and water tank to connect into a sealing and circulating water channel in the cylinder head, and with water pump water is flowed then, the heat energy of motor is taken away from cooling water tank.Cylinder head be owing to the reason of water channel must be made with the low-pressure die casting mode, processing difficulties and cost height; And the distribution device layout in the casing is generally used the overhead cam design, camshaft needs to be connected with timing gear through synchronous band or synchronous chain, make housing structure big and complicated, not only occupied the spatial volume of cylinder block front and back, and make all corresponding raising of manufacture cost of distribution device annex such as rocking arm, camshaft of control corresponding valve, conventional at present for this reason above-mentioned water cooled engine cylinder head and casing must separately be made, and carry out segmented again and connect, and obviously are not suitable for making mini engine.

Summary of the invention

The utility model purpose is: at the deficiencies in the prior art, provide a kind of opposed type straight arrangement double-cylinder engine, keep working stability, have simple in structurely when noise is low, volume is little, the characteristics of low cost of manufacture.

The technical solution of the utility model is: a kind of opposed type straight arrangement double-cylinder engine comprises being positioned at two cylinders that cylinder head is arranged in parallel and the bent axle that is positioned at crankcase that the piston in the cylinder drives bent axle by connecting rod; Each cylinder all has and overlaps independently distribution device, and two cover distribution devices lay respectively at the outside of two cylinders, and opposed with respect to the junction plane of two cylinders.

The further technological scheme of the utility model is: a kind of opposed type straight arrangement double-cylinder engine comprises being positioned at two cylinders that cylinder head is arranged in parallel and the bent axle that is positioned at crankcase that the piston in the cylinder drives bent axle by connecting rod; Each cylinder all has and overlaps independently distribution device, and two cover distribution devices lay respectively at the outside of two cylinders, and opposed with respect to the junction plane of two cylinders.Timing gear in every cover distribution device are installed on the bent axle and drive camshaft, and the cam on the camshaft contacts tappet, and tappet contacts push rod, and push rod is by the switch of rocking arm control valve; For every cover distribution device, described camshaft has two, these two camshafts be arranged in parallel with bent axle side by side and respectively, every camshaft is provided with a cam, timing gear on the described bent axle are driving gear, and be fixed therein a driven gear engagement on the camshaft, be fixed with intermeshing driving gear respectively on two camshafts.

The more detailed technological scheme of the utility model is: a kind of opposed type straight arrangement double-cylinder engine comprises being positioned at two cylinders that cylinder head is arranged in parallel and the bent axle that is positioned at crankcase that the piston in the cylinder drives bent axle by connecting rod; Each cylinder all has and overlaps independently distribution device, and two cover distribution devices lay respectively at the outside of two cylinders, and opposed with respect to the junction plane of two cylinders.Timing gear in every cover distribution device are installed on the bent axle and drive camshaft, and the cam on the camshaft contacts tappet, and tappet contacts push rod, and push rod is by the switch of rocking arm control valve; For every cover distribution device, described camshaft has two, these two camshafts be arranged in parallel with bent axle side by side and respectively, every camshaft is provided with a cam, timing gear on the described bent axle are driving gear, and be fixed therein a driven gear engagement on the camshaft, be fixed with intermeshing driving gear respectively on two camshafts.Cam on described two camshafts is positioned at same plane, and this plane is vertical with camshaft with bent axle; Valve on the described same cylinder is intake valve and exhaust valve, and their line is vertical with camshaft with bent axle.

Be the intake valve on each cylinder and exhaust valve is opposed is distributed in the bent axle both sides in the utility model, and the terminal general fan blade of installing of bent axle, so intake valve is vertical with the wind direction of cooling air with line between exhaust valve.Be equivalent to two back-to-back combinations arranged side by side of single cylinder head for the utility model, the distribution device of each cylinder head all is toward the outer side, and the overall structure of the whole opposed type straight arrangement double-cylinder engine after the combination can be symmetrical fully.

The utility model has the advantages that:

1. be that two cylinders are provided with independence respectively and are opposite to the distribution device of cylinder head both sides in the utility model opposed type straight arrangement double-cylinder engine, with conventional straight arrangement double-cylinder engine structure relatively, simplified complicated housing structure, make the cylinder head and the casing of conventional straight arrangement double-cylinder engine one to design, saved the low-pressure die casting expense of cylinder head costliness; Mould depanning, part processing are all very convenient, greatly reduce cost, are suitable as the less motor of volume.Certainly compare the V-type twin cylinder engine, increased the stability of work, reduced by a Carburetor, also simplified the structure of annexes such as casing, distribution device simultaneously.

2. because each distribution device in the utility model is equipped with two camshafts parallel with bent axle, a cam is set, therefore on two camshafts respectively, shortened the length of camshaft, reduced the volume of crankcase, further reduced motor volume and weight, be convenient to the user and carry.

3. two camshafts owing to the every cover distribution device in the utility model are set up in parallel, two cams are positioned at same plane, therefore, line between two valves of same cylinder and bent axle and camshaft are perpendicular, just the wind direction with cooling air is vertical, compared with prior art turn over 90 degree, thereby help the heat radiation of cylinder head, also just helped reducing the noise in the cylinder.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further described:

Fig. 1 is an overall structure schematic representation of the present utility model;

Fig. 2 is the A-A cross section view of Fig. 1;

Fig. 3 controls the driving gear set structure diagram of same cylinder valve for the utility model.

Wherein: 1, cylinder head; 2, cylinder; 3, crankcase; 4, bent axle; 5, piston; 6, connecting rod; 7, timing gear; 8, camshaft; 9, cam; 10, tappet; 11, push rod; 12, rocking arm; 13, intake valve; 14, exhaust valve; 15, driven gear; 16, driving gear; 17, fan blade.

Embodiment

Embodiment: in conjunction with Fig. 1, Fig. 2, Figure 3 shows that the utility model opposed type straight arrangement double-cylinder engine embodiment, it comprises two cylinders that are arranged in parallel 2 that are positioned at cylinder head 1 and the bent axle 4 that is positioned at crankcase 3, piston 5 in each cylinder 2 drives bent axle 4, the same fan blade 17 that is equipped with routine of bent axle 4 one ends by connecting rod 10.

Each cylinder 2 all has and overlaps independently distribution device, and two cover distribution devices lay respectively at the outside of two cylinders 2, and opposed with respect to the junction plane of two cylinders (2).

Described every cover distribution device comprises timing gear 7, cam week 8, cam 9, tappet 10, push rod 11 and rocking arm 12, timing gear 7 are installed on the bent axle 4 and drive camshaft 8, cam 9 on the camshaft 8 contacts corresponding tappet 10, tappet 10 contacts corresponding push rod 11, push rod 11 is by the intake valve 13 on corresponding rocking arm 12 control cylinders 2 and the switch of exhaust valve 14, and the line between intake valve 13 and the exhaust valve 14 is vertical with camshaft 8 with bent axle 4.

Camshaft 8 in every cover distribution device has two, and these two camshafts 8 be arranged in parallel with bent axle 4 side by side and respectively, and every camshaft 8 is provided with 9, two cams 9 of a cam and is positioned at same plane, and this plane is vertical with camshaft 8 with bent axle 4.Timing gear 7 on the described bent axle 4 are driving gear, and it meshes with being fixed therein a driven gear 15 on the camshaft 8, and is fixed with intermeshing driving gear 16 respectively on two camshafts 8.

Be equivalent to two back-to-back combinations arranged side by side of single cylinder head for present embodiment, the distribution device of each cylinder head all is toward the outer side, and the overall structure of the whole opposed type straight arrangement double-cylinder engine after the combination is symmetrical fully.

Be that two cylinders 2 are provided with independence respectively and are opposite to the distribution device of cylinder head 1 both sides in the opposed type straight arrangement double-cylinder engine of present embodiment, with conventional straight arrangement double-cylinder engine structure relatively, simplified complicated housing structure, make the cylinder head and the casing of conventional straight arrangement double-cylinder engine one to design, saved the low-pressure die casting expense of cylinder head costliness; Mould depanning, part processing are all very convenient, greatly reduce cost, are suitable as the less portable engine of volume.Certainly compare the V-type twin cylinder engine, improved the stability of work, saved a Carburetor, simplified the structure of casing, distribution device.

Because the every cover distribution device in the present embodiment is equipped with two camshafts 8 parallel with bent axle 4, a cam 9 is set respectively again on two camshafts 8, therefore, shortened the length of camshaft 8, reduced the volume of crankcase 3, further reduced motor volume and weight, be convenient to the user and carry.

Because two camshafts 8 of each distribution device in the present embodiment are set up in parallel, two cams 9 are positioned at same plane, therefore, line between two valves of same cylinder 2 and bent axle 4 and camshaft 8 are perpendicular, just the wind direction with cooling air is vertical, compared with prior art turn over 90 degree, thereby help the heat radiation of cylinder head, also just helped reducing the noise in the cylinder.

Claims

1. opposed type straight arrangement double-cylinder engine comprises being positioned at two cylinders (2) that cylinder head (1) is arranged in parallel and the bent axle (4) that is positioned at crankcase (3) that the piston (5) in the cylinder (2) drives bent axle (4) by connecting rod (6); It is characterized in that each cylinder (2) all has overlaps independently distribution device, and two cover distribution devices lay respectively at the outside of two cylinders (2), and opposed with respect to the junction plane of two cylinders (2).

2. opposed type straight arrangement double-cylinder engine according to claim 1, it is characterized in that described each distribution device comprises timing gear (7), camshaft (8), cam (9), tappet (10), push rod (11) and rocking arm (12), the timing gear (7) that are installed on the bent axle (4) drive camshaft (8), cam (9) on the camshaft (8) contacts tappet (10), tappet (10) contacts push rod (11), and push rod (11) is by the switching of rocking arm (12) control valve.

3. opposed type straight arrangement double-cylinder engine according to claim 2, it is characterized in that: the camshaft (8) in every cover distribution device has two, these two camshafts (8) be arranged in parallel with bent axle (4) side by side and all, and every camshaft (8) is provided with a cam (9).

4. opposed type straight arrangement double-cylinder engine according to claim 2, it is characterized in that: for every cover distribution device, the timing gear (7) that are installed on the bent axle (4) are driving gear, and with driven gear (15) engagement that is fixed on the camshaft (8), and be fixed with intermeshing driving gear (16) on two camshafts (8) respectively.

5. according to claim 3 or 4 described opposed type straight arrangement double-cylinder engines, it is characterized in that: for every cover distribution device, the cam (9) on two camshafts (8) is positioned at same plane.

6. according to claim 3 or 4 described opposed type straight arrangement double-cylinder engines, it is characterized in that: intake valve (13) and the line between the exhaust valve (14) in every cover distribution device are vertical with camshaft (8) with bent axle (4).