CN102678373A

CN102678373A - Diesel engine cylinder head

Info

Publication number: CN102678373A
Application number: CN2011100648326A
Authority: CN
Inventors: 李壮; 张雷; 朱杰; 张振平
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2011-03-14
Filing date: 2011-03-14
Publication date: 2012-09-19
Anticipated expiration: 2031-03-14
Also published as: CN102678373B

Abstract

The invention discloses a diesel engine cylinder head which comprises a cylinder head body provided with a water cavity. Upper water holes which are communicated with the water cavity are opened on the cylinder head body, the four upper water holes are opened in each cylinder diameter range and are a upper water hole (2a), a upper water hole (2b), a upper water hole (2c) and a upper water hole (2d) respectively, and a water baffle board is arranged above the upper water hole (2a) and the upper water hole (2b) on one side of an gas inlet and enables cooling water to cool an exhaust passage and a corresponding nose bridge area firstly after the cooling water enters into the water chamber. A deflector is arranged between the water baffle board and a cylinder head baseboard and arranged to face a cylinder head oil injection hole. Root portions of outlets of gas inlet passages are cast together, and a nose area gap is not reserved on the root portions. According to the diesel engine cylinder head, the structure of the water cavity is simplified, water flow directions can be effectively organized, manufacturing difficulties can be reduced, and the cost can be reduced.

Description

A kind of cylinder cover for diesel engine

Technical field

The present invention relates to a kind of cylinder cover for diesel engine, particularly a kind of water cavity structure of cylinder cover for diesel engine.

Background technique

The engine cylinder cover operating conditions is harsh; Be in the condition of high temperature under most operating modes,, often need complicated inner chamber design so the cooling of the inner significant points of cylinder cap is very important; Make the effective tissue flow of cooling water; Successively cool off needing the position of cooling in the cylinder cap by significance level, if but the water cavity structure is too complicated, and then increase manufacture difficulty, increase cost; And too simply can't satisfy the cooling requirement, a kind ofly have the engine cylinder cap of simplifying and can effectively cooling off the water cavity of significant points in the cylinder cap and have great importance so design.

Summary of the invention

The present invention is in order to overcome defective in the above-mentioned existing technology, a kind of cylinder cover for diesel engine to be provided, the water cavity designs simplification in this cylinder head, and effectively the tissue water flow path direction reduces manufacture difficulty, reduces cost.

Cylinder cover for diesel engine of the present invention; Comprise the cylinder head body that is provided with water cavity; Offer the last water hole that is communicated with said water cavity on the cylinder head body, the quantity of last water hole in each cylinder diameter scope is four, is respectively

water hole

2a, 2b, 2c, 2d; Wherein two of air inlet one side go up water hole 2a, the 2b top is provided with manger board, manger board makes cooling water get into behind the water cavity coolant exhaust road and corresponding nasal bridge region at first.

Preferably, be provided with guide plate between manger board and the cylinder head base plate, guide plate is provided with towards the cylinder cap fuel injector hole.

Preferably, guide plate thickness is 5mm.

Preferably, the width of manger board is 36.4mm, and thickness is 5mm.

Preferably, the distance of manger board one side margin and cylinder head body air inlet side working surface is 23mm; Manger board opposite side and air outlet flue wall keep the gap more than or equal to 8mm; Manger board is adopting arc transition with the intake duct junction point.

Preferably, the cooling water of

water hole

2b, 2d cools off the inlet and outlet road through the guide functions of inlet and outlet road wall in the entering.

Preferably, intake duct outlet root place is cast in together and does not stay the interval crack of the bridge of the nose.

Compared with prior art, the present invention has following beneficial effect:

1, the present invention does not adopt the form of central diaphragm; But only cast out narrower together manger board; And between manger board and cylinder head base plate, cast out guide plate (standing between water hole 2a, the 2b), and current are play the guiding role, can make cooling water flow to the position that needs most cooling earlier;

2, two intake duct outlet root places are cast in together, the gap of not staying current to pass through can be optimized water (flow) direction effectively; Simplified cylinder cap water cavity internal structure greatly; Be beneficial to casting, reduce blank and produce the waste product probability, reduce cost; Improve the economical of cylinder cap manufacturing, do not influenced the reliability of cylinder cap simultaneously.

Description of drawings

Fig. 1 is the plan view of cylinder cover for diesel engine of the present invention;

Fig. 2 is that the A of Fig. 1 is to side view;

Fig. 3 is that the F-F of Fig. 1 is to sectional view;

Fig. 4 is that the D-D of Fig. 1 is to sectional view;

Fig. 5 is the partial schematic diagram of Fig. 3;

Fig. 6 is the partial schematic diagram of Fig. 4;

Fig. 7 is that the A-A of Fig. 2 is to sectional view;

Fig. 8 is that the C-C of Fig. 2 is to sectional view;

Fig. 9 is that the G-G of Fig. 3 is to sectional view.

In conjunction with the accompanying drawing following reference character of mark above that:

1-cylinder head body, 2a, 2b, 2c, the last water hole of 2d-, 3-manger board; 4-intake duct wall, 5-air outlet flue wall, 6-guide plate; The 7-oil injector hole, the casting section between two outlets of 8-intake duct (not establishing the interval crack of the bridge of the nose), the interval crack of the bridge of the nose (being used for current) the L1-manger board width (36.4mm) between two outlets of 9-air outlet flue through cooling; The gap of L2-manger board and air outlet flue wall (greater than 8mm); The R-manger board with near intake duct engages transition arc radius (25.6mm), L3-guide plate thickness (5mm), L4-manger board thickness (5mm).

Embodiment

Below in conjunction with accompanying drawing, an embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention does not receive the restriction of embodiment.

As shown in Figure 1, be the plan view of Four-valve diesel engine cylinder head of of the present invention; Fig. 2 is that the A of Fig. 1 is to view.Shown in Fig. 3-6; Cylinder head body 1 is provided with water hole 2 (comprise water hole 2a, go up water hole 2b, go up water hole 2c, go up water hole 2d), intake duct wall 4, air outlet flue wall 5; Last water hole 2 is provided with manger board 3 (like Fig. 3, shown in 4) above the air inlet side, be provided with guide plate 6 between the bottom of cylinder head body 1 and the manger board 3, and manger board 3 links to each other with two intake duct walls; Manger board thickness is 5mm (this thickness is L4 among Fig. 9); Width L1 is 36.4mm, and manger board 3 keeps greater than 8mm gap (being that L2 is greater than 8mm) with air outlet flue wall 5, and be the R25.6 arc transition near intake duct engages.

Guide plate 6 is cast in cylinder head body 1 base plate and manger board 3, roughly being oriented of guide plate 6 towards oil injector hole 7 centers, and guide plate 6 thickness L3 are 5mm (as shown in Figure 4).

As shown in Figure 7; Two outlets of intake duct wall 4 are cast together, and (this intake duct regional temperature is lower, therefore need not to reserve the gap that supplies cooling water to pass through promptly not stay the interval crack of the bridge of the nose; This design can effectively increase the suction port area), see also the casting section 8 between intake duct two outlets among the figure.

As shown in Figure 8; The interval crack of the bridge of the nose is set between two outlets of air outlet flue wall 5, and (this air outlet flue regional temperature is higher; Be the position that need cool off, cooling water can get at first should the zone and cool off through the interval crack of this bridge of the nose), see also the interval crack 9 of the bridge of the nose between air outlet flue two outlets among the figure.

During work; When cooling water when the last water hole 2a of cylinder head body 1 base plate gets into the cylinder cap water cavity; Respectively because air outlet flue-air outlet flue that the guide functions of manger board 3 and guide plate 6 at first flows to cooling water needs most cooling and the nasal bridge region between intake duct-air outlet flue; Cooling water from

last water hole

2b, 2d entering cylinder cap under the guide functions of intake and exhaust port wall, directly cools off intake and exhaust port; And flow to nasal bridge region and cylinder head plate is cooled off, go up the cooling water that the water hole gets into cylinder cap from 2c and then flow to water outlet along water (flow) direction.Because inlet temperature is lower, as previously mentioned, this design does not leave the slit at two outlets of intake duct root simultaneously; Therefore leave bigger space for increasing the suction port area, and better organize cooling water flow, when having satisfied cooling water the cooling of cylinder cap inside is required to the position that needs most cooling; Simplified the inner structure of water cavity; Reduce manufacture difficulty, reduce cost, and effectively improved the reliability and the durability of cylinder cap.

More than disclosedly be merely a specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.

Claims

1. cylinder cover for diesel engine; Comprise the cylinder head body that is provided with water cavity, offer the last water hole that is communicated with said water cavity on the cylinder head body, it is characterized in that; The quantity of last water hole in each cylinder diameter scope is four; Be respectively water hole (2a, 2b, 2c, 2d), wherein go up top, water holes (2a, 2b) and be provided with manger board for two of air inlet one side, manger board makes cooling water get into behind the water cavity coolant exhaust road and corresponding nasal bridge region at first.

2. cylinder cover for diesel engine according to claim 1 is characterized in that, is provided with guide plate between said manger board and the cylinder head base plate, and guide plate is provided with towards the cylinder cap fuel injector hole.

3. cylinder cover for diesel engine according to claim 2 is characterized in that, said guide plate thickness is 5mm.

4. according to any described cylinder cover for diesel engine in the claim 1 to 3, it is characterized in that the width of said manger board is 36.4mm, thickness is 5mm.

5. cylinder cover for diesel engine according to claim 4 is characterized in that, the distance of said manger board one side margin and cylinder head body air inlet side working surface is 23mm; Manger board opposite side and air outlet flue wall keep the gap more than or equal to 8mm; Manger board is adopting arc transition with the intake duct junction point.

6. cylinder cover for diesel engine according to claim 1 is characterized in that, the cooling water of water hole in the entering (2b, 2d) cools off the inlet and outlet road through the guide functions of inlet and outlet road wall.

7. cylinder cover for diesel engine according to claim 6 is characterized in that, said intake duct outlet root place is cast in together and does not stay the interval crack of the bridge of the nose.