CN202732015U

CN202732015U - Overhead camshaft cylinder cover

Info

Publication number: CN202732015U
Application number: CN 201220401277
Authority: CN
Inventors: 徐江涛; 柯小松; 刘飞
Original assignee: BEIJING CHANGYUAN HERO CITY TECHNOLOGY Co Ltd
Current assignee: BEIJING CHANGYUAN HERO CITY TECHNOLOGY Co Ltd
Priority date: 2012-08-14
Filing date: 2012-08-14
Publication date: 2013-02-13
Anticipated expiration: 2022-08-14

Abstract

The utility model provides an overhead camshaft cylinder cover which is used for assembly of an engine. The top face of the cylinder cover is provided with a gas inlet side face, an exhaust side face, a front end face and a rear end face. Gas inlet valve guide pipe columns and exhaust valve guide pipe columns for installing valve lifters are arranged in a cavity of the top face. Cam shaft mounting seats are arranged on the top face close to the direction of the gas inlet side face in casting mode. Rocker arms are arranged on rocker arm seat mounting bosses. A penetrating oil return duct is arranged between the front end face and the rear end face of the cylinder cover. The oil return duct is connected with cam shaft mounting bosses through penetrating oblique oil holes. The overhead camshaft cylinder cover lessens weight of the whole engine, reduces integral casting and assembling difficulty of the whole engine, reduces noises, rejection rate of engine blanks and cost, effectively relieves abrasions of parts, increases medium-speed and high-speed power output and transmission efficiency of the engine so as to enable the engine to be capable of adapting to high-speed running, and effectively improves the peak value and market competitiveness of the engine.

Description

The overhead camshaft cylinder cap

Technical field

The utility model relates to the Manufacturing Technology for Automotive Parts field, specifically a kind of overhead camshaft cylinder cap.

Background technique

Camshaft is one of five large core members of motor, and its effect is the opening and closing action of control valve.Although the rotating speed of camshaft is half of bent axle in four stroke engine, but its rotating speed is still very high usually, and need to bear very large moment of torsion, and the valve motion rule is related to power and the service performance of motor, thus camshaft design in the design process of motor in occupation of consequence very.The purpose of its design is to guarantee the sufficient air inlet of cylinder and exhaust, is exactly the open and close action of finishing valve within the short as far as possible time specifically.Consider in addition the durability of motor and the smoothness of running, valve can not produce too much excessive impact because of the acceleration, deceleration process in the open and close action, otherwise will cause the heavy wear of valve, noise to increase or other serious consequence.Therefore, the smoothness of the power of cam and motor, moment of torsion output and running has very direct relation.

Conventional construction all is arranged in camshaft hole on the cylinder body, so that carry out gear transmission between bent axle and the camshaft.The present engine cylinder body generally adopts the mode of structure of OHV, but has following drawback.

1, the casting cost of motor is high.The cylinder body body has very complicated water route, oil circulation, because adopt cylinder body side cam, the pre-casting hole of camshaft must be cast with cylinder blank, so the actual casting difficulty of cylinder body strengthens, reject rate and cost rise, and are unfavorable for fierce at present market competition.

2, owing to adopt the OHV structure, camshaft is installed on the cylinder body, and the valve of engine chamber is positioned on the cylinder cap, in order to be the to-and-fro motion of valve, must come transferring power with valve tappet to the rotational transform of camshaft.Like this, reciprocating part is more, has increased assembling difficulty, and whole inertial mass is large, is unfavorable for the high engine speeds motion.

3, camshaft uses tappet to be connected before with the valve transmission, and valve and camshaft place respectively on the cylinder cap and cylinder body of motor, therefore require valve tappet to have enough length, but elongated tappet has certain elasticity, cause easily vibration, accelerate parts depreciation, even make valve out of hand.

4, elongated tappet and tappet are arranged between camshaft and the valve, the transmission stroke is longer, and structure is too fat to move, and transmission efficiency is than low.

5, the gap between camshaft and the tappet is large, and cam can clash into when tappet is combined, thereby produces abnormal sound.

Summary of the invention

For overcoming the deficiencies in the prior art, goal of the invention of the present utility model is to provide a kind of overhead camshaft cylinder cap, by the installation of camshaft is transferred on the cylinder cap from cylinder body, thereby reaches the raising product reliability, reduces the purpose of product cost.

For achieving the above object, be distributed with air inlet side, exhaust side and front-end face and ear end face on the end face of cylinder cap of the present utility model, it is characterized in that: be distributed with in the chamber of end face for intake valve conductor string and exhaust valve conductor string that valve tappet is installed; Be cast with cam shaft installing seat in the direction near the air inlet side, rocking arm is contained on the rocker arm bracket installation base; Between the front-end face of cylinder cap and ear end face, the back oil road that runs through is arranged, linked to each other by the inclined oil hole of air that runs through between back oil road and the camshaft installation base.

The utility model compared with prior art has following advantage.

1, adopts overhead camshaft, camshaft has been configured on the cylinder cap of motor, after only needing before and after the control two grades and middle bay to adopt to support, just can guarantee the normal function of camshaft, reduced the weight of whole motor; Reduced simultaneously cast inblock and the assembling difficulty of motor, reduced reject rate and the cost of motor blank, Effective Raise the market competitiveness.

2, shortened distance between camshaft and the valve.Omitted tappet and the tappet of valve, simplified camshaft to the driving mechanism between the valve, the structure of motor is become compacter, assembling difficulty reduces, and runs up so that motor more can adapt to, and has improved the peak value of motor.

3, by the rocker arm support direct-drive, avoided the vibration of adopting elongated tappet transmission to produce, effectively alleviated parts depreciation, so that the opening and closing of valve is still strictly followed the design original intention after long-term the use, and the whole velocity ratio of camshaft is improved.

4, the camshaft of wide-angle can prolong the opening time of valve, increases the lift of valve, makes intake valve and exhaust valve realize early opening and late closing, make more air enter cylinder, to improve the power output of the middle and high rotating speed of motor, reduce noise, improved transmission efficiency.

5, cylinder cap of the present utility model changes into after the overhead camshaft, gives the overall structure Reduction of Students' Study Load of cylinder body, and the front end gear that the has reduced cylinder body difficulty of arranging has reduced overall cost simultaneously.

Description of drawings

Fig. 1 is end face plan structure sketch of the present utility model.

Fig. 2 is the structure diagram of the ear end face of Fig. 1.

Fig. 3 is the structure diagram of the front-end face of Fig. 1.

Fig. 4 is the structure diagram of the L-L of Fig. 1.

Embodiment

Such as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, on the end face 2 of cylinder cap 1, be distributed with air inlet side 3, exhaust side 4 and front-end face 5 and ear end face 6, be distributed with intake valve conductor string 7 and exhaust valve conductor string 8 in the chamber of end face 2, valve tappet is installed in intake valve conductor string 7 and the exhaust valve conductor string 8; Be cast with cam shaft installing seat 9 in the direction near air inlet side 3, camshaft is contained in the cam shaft installing seat 9, the operating angle Cai Yong of camshaft＞=280 °, the material of camshaft is for hardening cast iron, casting surface alloying is carried out with the Cr-Mn-Mo alloy coating in the cam position; rocking arm is contained on the rocker arm bracket installation base 10, and the transmission of camshaft and valve directly realizes by rocking arm; Between the front-end face 5 of cylinder cap 1 and ear end face 6, the back oil road 11 that runs through is arranged, linked to each other by the inclined oil hole of air that runs through between back oil road 11 and the camshaft installation base 10, camshaft holder lubricated lubricated by the inclined oil hole of air DFF Direct Fuel Feed that communicates with cylinder cap 1 back oil road.

In the engine operation process, the camshaft that is installed in the cam shaft installing seat 9 rises by the rocking arm that cam driven is installed on the rocker arm bracket installation base 10, thereby the valve tappet that drives in the intake valve conductor string 7 descends, and this moment, exhaust valve conductor string 8 interior exhaust valve tappets rose under the spring-back force effect of the brute spring of afterbody; Behind camshaft rotation 1/2 circle, the rocking arm that drive is installed on the rocker arm bracket installation base 10 descends, thereby the exhaust valve tappet that drives in the exhaust valve conductor string 8 descends, this moment, the intake valve tappet rose under the spring-back force effect of the brute spring of afterbody, and then finished once unlatching, the closing course of engine valve.

Claims

1. overhead camshaft cylinder cap, be distributed with air inlet side (3), exhaust side (4) and front-end face (5) and ear end face (6) on the end face (2) of cylinder cap (1), it is characterized in that: be distributed with in the chamber of end face (2) for intake valve conductor string (7) and exhaust valve conductor string (8) that valve tappet is installed; Be cast with cam shaft installing seat (9) in the direction near air inlet side (3), rocking arm is contained on the rocker arm bracket installation base (10); Between the front-end face (5) of cylinder cap (1) and ear end face (6), the back oil road (11) that runs through is arranged, linked to each other by the inclined oil hole of air that runs through between back oil road (11) and the camshaft installation base (10).