CN220979592U

CN220979592U - Integrated cam structure and integrated cam valve mechanism

Info

Publication number: CN220979592U
Application number: CN202322420915.5U
Authority: CN
Inventors: 于洋; 孙鑫; 王赞; 沈天杨; 黄家兵; 邓玫; 严永华
Original assignee: Shanghai New Power Automotive Technology Co ltd
Current assignee: Shanghai New Power Automotive Technology Co ltd
Priority date: 2023-09-06
Filing date: 2023-09-06
Publication date: 2024-05-17
Anticipated expiration: 2033-09-06

Abstract

The utility model relates to an integrated cam structure and an integrated cam valve mechanism, and relates to the field of engines. The utility model is beneficial to reducing the volume and weight of the whole engine and reducing the material and production cost of the engine.

Description

Integrated cam structure and integrated cam valve mechanism

Technical Field

The utility model relates to the field of engines, in particular to an integrated cam structure and an integrated cam valve mechanism.

Background

At present, a lightweight design, a compact design and a low-cost design of an engine have become popular engine designs at present. The light weight and compact structure are realized by reducing the weight, the size, the modularized design and the integrated design of the parts as much as possible, and the cost of the parts can be reduced.

In-cylinder braking of the existing engine generally adopts a single braking cam structure, namely a single braking cam lift to control opening and closing of a valve. The single brake cam structure has obvious defects, particularly, the single brake cam structure leads to the need of 18 cams for one cam shaft, comprising 6 air inlet cams, 6 air outlet cams, 6 brake cams, 18 rocker arms, 6 air inlet rocker arms, 6 air outlet rocker arms and 6 brake rocker arms, thereby increasing the weight of the valve mechanism, occupying larger space and increasing the material cost; aiming at the braking valve clearance of each cylinder, the requirement of the braking valve clearance of each cylinder is sequentially adjusted by turning 6 times, so that the assembly working hour is further increased, and the assembly efficiency is reduced. With the development of engine technology, the requirements of the industry on the weight reduction and the compactness of the engine are higher and higher, and the single brake cam structure is not suitable for the requirements of the development of the engine technology, so that the improvement is needed.

In addition, some concepts related to the present utility model are further described as follows:

It should be noted that the camshaft is an important component in a piston engine and is used for controlling the opening and closing actions of the valves on the cylinders. The main body of the camshaft is a cylindrical rod body with the length approximately the same as that of the cylinder group. A plurality of cams are sleeved on the upper surface and are used for driving the valve.

Disclosure of utility model

The utility model aims to provide an integrated cam structure and an integrated cam valve mechanism, which adopt an integrated cam to control the opening and closing of all exhaust valves and brake valves in an engine, thereby reducing the volume and weight of a brake system of the engine and reducing the material and production cost.

In order to achieve the above purpose, the technical scheme of the utility model provides an integrated cam structure, wherein the integrated cam is composed of an integrated cam exhaust lift EX, a brake lift CR and an air supplementing lift BR.

Preferably, the three-step lift of the integrated cam is engaged back and forth according to the exhaust lift EX-air supplementing lift BR-braking lift CR of the integrated cam.

Preferably, the three-step lift transitions.

The technical scheme of the utility model also provides an integrated cam valve mechanism, which is provided with the integrated cam structure and 12 cams, wherein 6 cams are air inlet cams and 6 cams are integrated cams; the intake cam is composed of a base circle BC and an intake lift IN.

Preferably, during the ignition and working process of the engine, only the integrated cam exhaust lift EX is transmitted; during engine braking, all three-step lift is transferred.

Preferably, the cam gear of the engine is provided with 6 scale marks 1-2-3-4-5-6 corresponding to 1-2-3-4-5-6 cylinders of the engine respectively.

Preferably, in all the cylinder distribution combinations, each adjacent cylinder distribution combination shares a camshaft.

In summary, the utility model has the following beneficial technical effects:

In the integrated cam valve timing mechanism, all cylinder valve timing combinations move along with respective corresponding cylinders, and the air inlet and exhaust braking actions of the cylinders are controlled and driven by one cam shaft.

Compared with the prior art, the integrated cam valve mechanism reduces 6 cams in the cam shaft, and the integrated cam shaft is adopted to control the opening and closing of all cylinder valves in the engine, so that the volume and the weight of the whole engine are reduced, and the material and the production cost of the engine are reduced.

Drawings

FIG. 1 is a diagram of a common exhaust cam screen shot;

FIG. 2 is a cam screen shot of an integrated cam structure of the present utility model;

FIG. 3 is an assembly view of a camshaft and rocker arm mount;

FIG. 4 is an assembled view of a camshaft and rocker arm.

Reference numerals: 1. ordinary exhaust lift EX; 2. a base circle BC; 3. integrated cam exhaust lift EX; 4. tonifying qi lifting path BR; 5. braking lift CR; 6. an integrated cam; 7. an intake cam; 8. a cam shaft scale mark; 9. the rocker arm seat and the cam shaft scale mark correspond to the notch; 10. an exhaust rocker arm; 11. an intake rocker arm.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1:

The ordinary exhaust cam is composed of only the base circle BC2 and the ordinary exhaust lift EX 1. The embodiment of the utility model discloses an integrated cam structure, wherein an integrated cam 6 is respectively composed of 3 sections of lifts, namely an integrated cam exhaust lift EX3, a brake lift CR5 and a gas supplementing lift BR4;

The three-section lift is in transitional engagement, so that the lift requirement is met, and the motion bearing capacity of the valve actuating mechanism is met, such as the inclination of a valve bridge is met, and the valve seating speed is met; the three-section lift of the integrated cam 6 must be in accordance with the front-rear joint design sequence of EX-BR-CR, otherwise, the engine brake performance requirement cannot be met; the design of the integrated cam 6 must ensure that the engine cylinder is pressed within a certain range under the lift, otherwise, serious faults such as valve deflection, fuel injector failure and the like are caused.

The brake valve clearance of the single cam brake type needs 6 times of adjustment, the intake and exhaust valve clearance needs 2 times of adjustment, and the total needs 8 times of adjustment; the integrated cam 6 machine type, the air inlet and exhaust clearance and the braking clearance are adjusted for only 6 times, and the assembly efficiency is improved.

The common engine with in-cylinder brake type cam shaft is generally of a three-cam design, namely an air inlet cam 7, an exhaust cam and a brake cam, and respectively drives a corresponding air inlet rocker arm 11, an exhaust rocker arm 10 and a brake rocker arm and drives a corresponding valve to open and close so as to meet the requirements of air inlet, air exhaust and brake of the engine, and meanwhile, the common three-cam design engine needs to be coiled for 8 times at least when adjusting the valve clearance.

The utility model integrates the exhaust cam and the brake cam, realizes the two functional requirements of exhaust and in-cylinder braking through one cam, and reduces the turning times to 6 times. The advantage of doing so is that reduce cost, reduce weight, reduce the volume, improve assembly efficiency, extensive applicability.

Example 2:

The embodiment discloses an integrated cam valve mechanism provided with the integrated cam 6 in the embodiment 1, wherein the integrated cam valve mechanism is provided with 12 cams, 6 of the cams are air inlet cams 7, and 6 of the cams are integrated cams 6; the intake cam 7 is composed of a base circle BC2 and an intake lift IN, and the integrated cam 6 is composed of an integrated cam exhaust lift EX3, a brake lift CR5, and a charge lift BR 4.

Further, in all the cylinder distribution combinations, each adjacent cylinder distribution combination shares a camshaft.

The camshaft gear of the engine is provided with 6 scale marks 1-2-3-4-5-6 which respectively correspond to 1-2-3-4-5-6 cylinders of the engine, and when the scale marks are positioned in the middle of the gap of the rocker arm seat, the exhaust valve clearance and the brake valve clearance of the corresponding cylinders can be adjusted at one time.

In the ignition working process of the engine, only the integrated cam exhaust lift EX3 is transmitted; during engine braking, all 3 cam lifts EX, BR, CR are transferred.

Finally, it should be noted that: the foregoing description of the preferred embodiments of the present utility model is not intended to be limiting, but rather, although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.

Claims

1. The integrated cam structure is characterized in that the integrated cam (6) is composed of three-section lift of an integrated cam exhaust lift EX (3), a brake lift CR (5) and an air supplementing lift BR (4); and the three-section lift of the integrated cam (6) is connected back and forth according to the exhaust lift EX (3) -the air supplementing lift BR (4) -the braking lift CR (5) of the integrated cam.

2. An integrated cam structure according to claim 1 wherein the three-step lift transitions.

3. An integrated cam valve train provided with an integrated cam structure according to any one of claims 1-2, characterized in that 12 cams are provided, 6 of which are intake cams (7) and 6 of which are said integrated cams (6); the intake cam (7) is composed of a base circle BC (2) and an intake lift IN.

4. An integrated cam valve train according to claim 3, characterized in that only the integrated cam exhaust lift EX (3) is transmitted during engine ignition work; during engine braking, all three-step lift is transferred.

5. An integrated cam valve train according to claim 4 wherein the cam gear of the engine has 6 scale markings 1-2-3-4-5-6 corresponding to 1-2-3-4-5-6 cylinders of the engine, respectively.

6. An integrated cam valve train according to claim 5 wherein each adjacent cylinder valve train shares a camshaft among all cylinder valve trains.