CN201671721U

CN201671721U - Four-stroke engine

Info

Publication number: CN201671721U
Application number: CN2010201969170U
Authority: CN
Inventors: 吴世舟
Original assignee: SUZHOU ERMA MACHINERY CO Ltd
Current assignee: SUZHOU ERMA MACHINERY CO Ltd
Priority date: 2010-05-20
Filing date: 2010-05-20
Publication date: 2010-12-15
Anticipated expiration: 2020-05-20

Abstract

The utility model discloses a four-stroke engine, which comprises a left box cover, a middle box and a right box cover which are sequentially fixed. A cylinder is integrally formed on the upper portion of the middle box; a piston inside the cylinder is connected with a crankshaft through an integral striking and forged connecting rod; bearing supports for mounting crankshaft bearings are arranged on both the left box cover and the right box cover; a first parting surface of the left box cover and the middle box is parallel to a second parting surface of the right box cover and the middle box; and simultaneously both the first parting surface and the second parting surface are perpendicular to the center connecting line of the two crankshaft bearings. The four-stroke engine greatly simplifies assembly process by improving the structure of the box, and improves interchangeability of parts as all the parts of the four-stroke engine need no combined processing, thereby further saving manufacturing cost.

Description

Four stroke engine

Technical field

The utility model relates to a kind of four stroke engine.

Background technique

As everyone knows, existing mini four-stroke motor generally all preferentially adopts integrated type to forge connecting rod, and this is because one of advantage that integrated type forges connecting rod is the intensity height, adapts to the high rotating speed operation of this type of motor; Next is to reinstall in the engine housing after connecting rod only needs just can be assembled into integral body (being the crankshaft-link rod piston assembly) together with bent axle and piston by crank pin and wrist pin because integrated type forges, assembling process is comparatively convenient, and can save the position of connecting-rod bolts, the reduction volume is so be adapted to the internal structure layout of this type of motor compactness.Certainly the assembling of above-mentioned bent axle Piston and rod assembly for convenience in practice, the casing of existing mini four-stroke motor only adopts following two kinds of structural types:

1, the casing mold joint adopts oblique plane type, and one of them bearing hole adopts split type.But this kind housing structure also is difficult to the control part precision owing to adopt oblique plane type certainly will increase manufacture cost, and because adopted split type bearing hole, must adopt combined type processing, has further increased difficulty of processing.And each bearing cap all must singly be joined no interchangeability.

2, casing is divided into upper and lower two-part along the bearing hole center, and this kind housing structure adds must adopt combined type processing, no interchangeability man-hour, the management of inconvenient component, maintainalbility is poor, and when wherein half casing was scrapped, the casing of second half that is complementary also must be scrapped with it.And component must match label, if obscure, certainly will cause whole motor cisco unity malfunction.

Summary of the invention

The utility model purpose is: provide a kind of assembling simple, component are easy to process, the four stroke engine of low cost of manufacture.

The technical solution of the utility model is: a kind of four stroke engine, comprise left case lid, middle housing and the right case lid of fixed order, and the top of described middle housing is one-body molded cylinder block, and the piston in the cylinder block forges connecting rod by integrated type and links to each other with bent axle; And described left and right box covers and is equipped with the bearing support that is used to install crankshaft bearing, and first mold joint of described left case lid and middle housing is parallel to second mold joint of right case lid and middle housing, and all the line of centres with two crankshaft bearings is vertical for described first, second mold joint simultaneously.

Bent axle described in the utility model equally is divided into left crank, right crank and crank pin three parts with routine techniques, it is fixing by crank pin and the assembling of left and right crank earlier that described integrated type forges connecting rod one end, and the other end fixes by wrist pin and piston more then.

The top of cylinder block described in the utility model is fixed with cylinder head, the position that described middle housing inherence is positioned at the cylinder block left side is provided with the cavity that is used to hold distribution device, described distribution device is a routine techniques, to no longer describing in detail in this utility model, but need be pointed out that further that the timing gear in the distribution device are fixed on the bent axle, and be meshed with cam wheel on being installed in the cylinder block sidewall.

Further, cylinder head described in the utility model is parallel with the line of centres of two crankshaft bearings with the three parting line of cylinder block.

The utility model is when concrete assembling, earlier integrated type is forged connecting rod, crankshaft and piston is assembled into single piece, then piston is adjusted to the lower dead center state, the size that need not to increase middle housing so just can be packed piston in the cylinder block on the middle housing, in the cavity of cylinder block one side, carry out the assembling of distribution device then, two crankshaft bearings by both sides after assembling finishes cover crankshaft installed to left and right box, and finish the fixing of left and right case lid and middle housing simultaneously, at last cylinder head is fixed on the cylinder block.

The utility model has the advantages that:

This four stroke engine that the utility model provides has been simplified assembly process greatly by housing structure is improved, and because its component all need not combination processing, so improved the interchangeability of each component, has further saved manufacture cost.

Description of drawings

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

Fig. 1 is a sectional view of the present utility model;

Fig. 2 is a stereochemical structure decomposing schematic representation of the present utility model;

Fig. 3 is an assembly process schematic representation of the present utility model.

Wherein: 1, middle housing; 1a, cylinder block; 2, left case lid; 3, right case lid; 4, crankshaft bearing; 5, bearing support; 6, piston; 7, integrated type forges connecting rod; 8, bent axle; 8a, left crank; 8b, right crank; 8c, crank pin; 9, wrist pin; 10, cylinder head; 11, timing gear; 12, cam wheel; A, first mold joint; B, second mold joint; C, three parting line.

Embodiment

Embodiment: in conjunction with Fig. 1, shown in Figure 2, this four stroke engine that the utility model provides comprises left case lid 2, middle housing 1 and the right case lid 3 of fixed order, the top of described middle housing 1 is one-body molded cylinder block 1a, and the piston 6 in the cylinder block 1a forges connecting rod 7 by integrated type and links to each other with bent axle 8; And be equipped with the bearing support 5 that is used to install crankshaft bearing 4 on the described left and right case lid 2,3, and the first mold joint A of described left case lid 2 and middle housing 1 is parallel to the second mold joint B of right case lid 3 and middle housing 1, and all the line of centres with two crankshaft bearings 4 is vertical for described first, second mold joint A, B simultaneously.Described bent axle 8 is divided into left crank 8a, right crank 8b and crank pin 8c three parts, and it is fixing by crank pin 8c and left and

right crank

8a, 8b assembling that described integrated type forges connecting rod 7 one ends, and the other end fixes by wrist pin 9 and piston 6.Described cylinder block 1a top is fixed with cylinder head 10, the position that described middle housing 1 inherence is positioned at cylinder block 1a left side is provided with the cavity that is used to hold distribution device, timing gear 11 in the described distribution device are fixed on the bent axle 8, and be meshed, and other component omission in the distribution device with cam wheel 12 on being installed in cylinder block 1a sidewall.Described cylinder head 10 is parallel with the line of centres of two crankshaft bearings 4 with the three parting line C of cylinder block 1a.

As shown in Figure 3, the utility model is when concrete assembling, earlier integrated type is forged connecting rod 7, bent axle 8 and piston 6 are assembled into single piece, then piston 6 is adjusted to the lower dead center state, the size that need not to increase middle housing 1 so just can be packed piston 6 in the cylinder block 1a on the middle housing 1, in the cavity of cylinder block 1 one sides, carry out the assembling (omitting this step among the figure) of distribution device then, two crankshaft bearings 4 by both sides after assembling finishes are mounted to a left side with bent axle 8, right case lid 2, on 3, and finish a left side simultaneously, right case lid 2,3 fixing with middle housing 1 are fixed to cylinder head 10 on the cylinder block 1a at last.

Certainly the foregoing description only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the people who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection domain of the present utility model with this.All equivalent transformation or modifications of doing according to the spirit of the utility model main technical schemes all should be encompassed within the protection domain of the present utility model.

Claims

1. four stroke engine, it is characterized in that comprising left case lid (2), middle housing (1) and the right case lid (3) of fixed order, the top of described middle housing (1) is one-body molded cylinder block (1a), and the piston (6) in the cylinder block (1a) forges connecting rod (7) by integrated type and links to each other with bent axle (8); And be equipped with the bearing support (5) that is used to install crankshaft bearing (4) on the described left and right case lid (2,3), and first mold joint (A) of described left case lid (2) and middle housing (1) is parallel to second mold joint (B) of right case lid (3) and middle housing (1), and all the line of centres with two crankshaft bearings (4) is vertical for described first, second mold joint (A, B) simultaneously.

2. four stroke engine according to claim 1, it is characterized in that described bent axle (8) is divided into left crank (8a), right crank (8b) and crank pin (8c) three parts, it is fixing with left and right crank (8a, 8b) assembling by crank pin (8c) that described integrated type forges connecting rod (7) one ends, and the other end fixes by wrist pin (9) and piston (6).

3. four stroke engine according to claim 1 is characterized in that described cylinder block (1a) top is fixed with cylinder head (10), and the position that described middle housing (1) inherence is positioned at cylinder block (1a) left side is provided with the cavity that is used to hold distribution device.

4. four stroke engine according to claim 3 is characterized in that the timing gear (11) in the described distribution device are fixed on the bent axle (8), and is meshed with cam wheel (12) on being installed in cylinder block (1a) sidewall.

5. four stroke engine according to claim 3 is characterized in that described cylinder head (10) is parallel with the line of centres of two crankshaft bearings (4) with the three parting line (C) of cylinder block (1a).