CN215633202U

CN215633202U - An engine camshaft VVT oil passage structure

Info

Publication number: CN215633202U
Application number: CN202120535681.7U
Authority: CN
Inventors: 钟成; 韦林郁; 曾丽娜; 杨德定; 廖振华; 闭仁湘; 周汝飞
Original assignee: LIUZHOU WULING LIUJI POWER CO Ltd
Current assignee: LIUZHOU WULING LIUJI POWER CO Ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2022-01-25
Anticipated expiration: 2031-03-15

Abstract

The engine camshaft VVT oil passage structure of the utility model is composed of the main oil passage of the cylinder head, the oil groove of the camshaft bearing cap, the oil passage at the front end of the camshaft, the central control valve bolt oil passage and the VVT oil passage which are connected in sequence. The front end is connected with the oil passage of the cylinder block. The oil circuit of the utility model is simple, the oil circuit is shortened, the matching parts are reduced, the oil pressure loss is reduced, and the VVT response speed can be effectively improved.

Description

VVT oil passage structure of engine camshaft

Technical Field

The utility model relates to the technical field of engines, in particular to a VVT oil passage structure of an engine camshaft.

Background

With the tightening of national emission standards and oil consumption standards, in order to achieve a better gas distribution effect and enable an engine to operate in a most suitable power output and economic area, a side-mounted OCV type VVT system is mostly adopted, and the opening and closing time of a valve is adjusted according to different engine load working conditions and rotating speeds, so that the combustion efficiency is improved, and the engine has better high-power and low-oil consumption performance.

As shown in fig. 1 and 2, a side OCV VVT oil supply system of a certain existing model controls an oil passage: the cylinder head main oil passage 1 → the VVT strainer 2 → the OCV valve oil passage 3 → the right cylinder head oil passage 4 → the camshaft first bearing cap oil passage 5 → the camshaft front end oil passage 6 → the VVT oil passage 7. The oil supply system has the following disadvantages: the oil circuit is very long and complicated, the leakage in the system is large, and the adjusting speed is slow. The side-mounted OCV type VVT oil supply system cannot meet the requirements of large-amplitude late closing of an intake valve of an Atkinson cycle and quick response.

Disclosure of Invention

The utility model aims to provide the VVT oil passage structure of the engine camshaft, aiming at the defects in the prior art, the oil passage is simple, the oil passage is shortened, the number of matched parts is reduced, the oil pressure loss is reduced, and the VVT response speed can be effectively improved.

The technical scheme adopted by the utility model for realizing the purpose is as follows: a VVT oil passage structure of an engine camshaft comprises a cylinder cover main oil passage, a camshaft bearing cover oil groove, a camshaft front end oil passage, a central control valve bolt oil passage and a VVT oil passage which are sequentially connected, wherein the front end of the cylinder cover main oil passage is connected with a cylinder body oil passage.

The further technical scheme of the utility model is as follows: the VVT oil way is a single inlet on the camshaft and comprises a VVT advancing oil way port B and a VVT retarding oil way port A, and a throttling plug is additionally arranged at the rear end of a journal lubricating oil inlet of an oil way at the front end of the camshaft.

The engine camshaft VVT oil passage structure has the following beneficial effects:

(1) according to the oil supply of the middle-positioned VVT oil supply system, the oil path is shortened, the number of matched parts is reduced, the oil pressure loss is reduced, the VVT response speed is changed from more than 75CA/s to more than 100CA/s through experiments, and the response speed is increased by 25%;

(2) the engine camshaft VVT oil passage structure has simple oil passage, only needs one common oil inlet passage, reduces the processing difficulty of a cylinder cover and the camshaft, and reduces the processing and production cost.

The structure of the VVT oil passage of the engine camshaft of the utility model is further explained in the following by combining the attached drawings and the embodiment.

Drawings

FIG. 1 is a schematic diagram of a prior art VVT oil supply system;

FIG. 2 is another schematic directional view of the oil supply system of the VVT of FIG. 1;

FIG. 3 is a schematic structural diagram of an engine camshaft VVT oil passage structure of the utility model;

FIG. 4 is a schematic structural diagram of the engine camshaft VVT oil passage structure before the central control valve bolt oil passage and the VVT oil passage are not connected;

the utility model is illustrated by the reference numerals: 11-cylinder oil passage, 12-cylinder cover main oil passage, 13-camshaft bearing cover oil groove, 14-camshaft front end oil passage, 15-central control valve bolt oil passage, 17-VVT advancing oil passage B port and 18-VVT retarding oil passage A port.

Detailed Description

As shown in fig. 3 and 4, the VVT oil passage structure of the engine camshaft of the present invention is composed of a cylinder head main oil passage 12, a camshaft bearing cap oil groove 13, a camshaft front end oil passage 14, a central control valve bolt oil passage 15, and a VVT oil passage, which are connected in sequence, wherein the front end of the cylinder head main oil passage 12 is connected with a cylinder body oil passage 11. The VVT oil passage is a single inlet on the camshaft, and comprises a VVT advancing oil passage B port 17 and a VVT retarding oil passage A port 18. A throttling plug 19 is added at the rear end of a journal lubricating oil inlet of the front end oil passage 14 of the camshaft.

A single cylinder cover main oil passage 12 is adopted, oil is supplied to a front end oil passage 14 of a camshaft of an intake and exhaust camshaft through a camshaft bearing cover oil groove 13, a VVT oil passage A, B is changed into a single inlet on the camshaft, and a throttling plug 19 is additionally arranged on the camshaft. The central control valve bolt oil passage 15 is communicated with the VVT oil passage, and when the oil passage in the central control valve is switched, the VVT oil passage is switched simultaneously. After the oil circuit is shortened, the phase modulation speed is increased, the VVT working response time is shortened, and the phase of an air inlet valve and an air outlet valve is adjusted in time.

The above embodiments are only preferred embodiments of the present invention, and the structure of the present invention is not limited to the forms of the above embodiments, and any modifications, equivalents and the like within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine camshaft VVT oil passage structure, characterized in that the main oil passage (12) of the cylinder head, the oil groove (13) of the camshaft bearing cap, the oil passage (14) at the front end of the camshaft, and the central control valve are sequentially connected. The bolt oil circuit (15) and the VVT oil circuit are composed, and the front end of the main oil passage (12) of the cylinder head is connected with the oil passage (11) of the cylinder block.

2. The engine camshaft VVT oil passage structure according to claim 1, wherein the VVT oil passage is a single inlet on the camshaft, and the VVT oil passage comprises a VVT advance oil passage B port (17) and a VVT lag Add a throttle plug (19) to the rear end of the journal lubricating oil inlet of the oil passage A (18) of the oil passage at the front end of the camshaft (14).