WO2013020357A1

WO2013020357A1 - Structure for cooling cylinder head of four-stroke engine

Info

Publication number: WO2013020357A1
Application number: PCT/CN2012/001029
Authority: WO
Inventors: 肖亨琳; 井锡昌
Original assignee: 无锡开普动力有限公司
Priority date: 2011-08-05
Filing date: 2012-07-31
Publication date: 2013-02-14
Also published as: CN102337981A

Abstract

A structure for cooling a cylinder head of a four-stroke engine. Arranged at the center of the cylinder head (1) is a fuel injector sleeve (2). Arranged around the fuel injector sleeve (2) are four valve seats (4) distributed evenly along the circumferential direction. Provided at a bottom face of the cylinder head (1) is a cooling water inlet (1a), which is used for introducing cooling water from a machine body to the cylinder head (1). Arranged within the cylinder head (1) is a cooling water passage (1b) in communication with the cooling water inlet (1a). The cooling water passage (1b) is arranged around the four valve seats (4). Arranged around the fuel injector sleeve (2) is a cooling chamber (1d) used for cooling a fuel injector and an air inlet/outlet passage. The cooling chamber (1d) is arranged above the cooling water passage (1b) and is in communication with the cooling water passage (1b) via a cooling water inlet passage (1c). The cooling water inlet passage (1c) is arranged in proximity around the fuel injector sleeve (2). Provided at a top part of the cooling chamber (1d) is a cooling water outlet (1e) used for discharging the cooling water. The mechanical load and heat load capacities of the cylinder head of the present invention are greatly improved, thus allowing for highly efficient completion of cooling of components of the cylinder head.

Description

Cylinder head cooling structure of four-stroke engine

[0001] The present invention belongs to the technical field of engines, and relates to a cooling water direction and structural design problem of a cylinder head of a four-stroke engine, in particular to a cylinder head cooling structure of a four-stroke engine. Background technique

[0002] With the continuous development of engine technology, the degree of engine reinforcement continues to increase, resulting in continuous increase in mechanical and thermal loads on engine components. How to ensure reliable operation of engine components has become a difficult problem in the technical department. The cylinder head is an important part of the engine. On the high-strength engine, the traditionally designed cylinder head often has cracks and other defects due to excessive heat load during use. How to reduce the heat load to ensure the cylinder The strength of the cover has become a key issue in the field of engine technology. Summary of the invention

[0003] The object of the present invention is to address the deficiencies in the design of the cylinder head cooling structure in the prior art, thereby providing a well-designed cylinder head cooling structure suitable for a four-stroke engine, that is, a cooling water passage for the cylinder head. The shape structure and the design of the arrangement of the inlet and outlet of the cooling water are obtained by fluid analysis to obtain a cooling structure.

[0004] According to the technical solution provided by the present invention, a cylinder head cooling structure of a four-stroke engine is provided with an injector sleeve at the center of the cylinder head, and four circumferentially evenly distributed valves are arranged around the injector sleeve. The seat is characterized in that: the bottom surface of the cylinder head is provided with a cooling water inlet for introducing cooling water from the body into the cylinder head; and the cylinder cover is provided with a cooling water channel communicating with the cooling water inlet. The cooling water channel is arranged around the four valve seats; a cooling cavity for cooling the fuel injector and the intake air passage is arranged around the fuel injector sleeve, the cooling chamber is located above the cooling water passage, and passes through the cooling water inlet channel and the cooling water channel In connection, the cooling water inlet is disposed near the injector casing; and the cooling chamber top is provided with a cooling water outlet for cooling water to flow out.

[0005] As a further improvement of the invention, the cooling water channel is located parallel to the bottom surface of the cylinder head.

As a further improvement of the present invention, there are four cooling water inlets which are evenly distributed around the injector casing in the circumferential direction, and the cooling water inlet is inclined from the bottom to the injector casing.

As a further improvement of the present invention, the cooling water passage is machined from the side of the cylinder head, and the outer end of the cooling water passage is suffocated with a stuffy head.

Compared with the prior art, the present invention has the advantages that the fluid analysis of the cylinder head and the inlet and outlet position of the cooling water are rationally designed by the fluid analysis, so that the mechanical load and the thermal load capacity of the cylinder head are greatly improved. The utility model can improve the cooling of each part of the cylinder head efficiently; the cylinder head of the invention can be cast and formed, the production process is simple, and the yield is improved. DRAWINGS

1 is a front elevational view of a cylinder head of the present invention.

2 is a plan view of a cylinder head of the present invention.

3 is a cross-sectional view taken along line A-A of FIG. 2. 4 is a cross-sectional view taken along line BB of FIG. 3.

DESCRIPTION OF REFERENCE NUMERALS: 1 cylinder head, la-cooling water inlet, lb-cooling channel, lc-cooling water inlet, Id-cooling chamber, le-cooling water outlet, 2-injector sleeve 3, bulkhead, 4 one valve seat. detailed description

[0014] The present invention will be further described below in conjunction with the embodiments in the drawings.

[0015] As shown in FIG. 4, the cylinder head 1 is provided with a fuel injector sleeve 2 for installing an injector, and four valve seats uniformly distributed in the circumferential direction around the injector sleeve 2. 4; the bottom surface of the cylinder head 1 is provided with a cooling water inlet la for introducing the cooling water from the body into the cylinder head 1; the cylinder head 1 is provided with a cooling water channel communicating with the cooling water inlet la Lb, a cooling water passage lb is disposed around the four valve seats 4; a cooling chamber ld for cooling the injector and the intake/exhaust passage is disposed around the injector casing 2, and the cooling chamber Id is located above the cooling water passage lb, and The cooling water inlet lc is communicated with the cooling water passage 1b, which is disposed near the vicinity of the injector casing 2; and the cooling water inlet Id is provided with a cooling water outlet port le for cooling water to flow out.

As shown in FIGS. 1, 3, and 4, the cooling water inlet la is machined from the bottom surface of the cylinder head 1. The cooling water passage lb is located parallel to the bottom surface of the cylinder head 1, and the cooling water passage lb is machined from the side of the cylinder head 1, and the outer end of the cooling water passage lb is suffocated with the bulkhead 3. There are four cooling water inlets lc, which are evenly distributed around the injector casing 2 in the circumferential direction. The cooling water inlets lc are machined from the hole above the injector cover 2, and they are oriented from bottom to top. The injector sleeve 2 is tilted so that cooling of the injector sleeve 2 can be ensured. The cooling chamber Id and the cooling water outlet le are sand cavities which can be cast.

[0017] In the specific work, the cooling water is discharged from the body, enters the cylinder head 1 through the four cooling water inlets la on the bottom surface of the cylinder head 1, and flows from the periphery of the cylinder head 1 to the center through the cooling water passage lb, and the cylinder head 1 is cooled at the bottom, and then enters the cooling chamber Id through the four cooling water inlets lc around the injector sleeve 2, cools the injector and the inlet and exhaust passages, and finally flows out from the cooling water outlet port. Entering the return water line completes the cooling of the bottom of the cylinder head 1, the valve seat 4, the injector and the intake/exhaust passage.

Claims

A cylinder head cooling structure for a four-stroke engine, in which a fuel injector sleeve (2) is installed in the center of the cylinder head (1), and four circumferentially evenly distributed valves are arranged around the injector sleeve (2) a seat (4), characterized in that: the bottom surface of the cylinder head (1) is provided with a cooling water inlet (la) for introducing cooling water from the body into the cylinder head (1); the cylinder head (1) There is a cooling water channel (lb) connected to the cooling water inlet (la), and a cooling water channel (Lb) is arranged around the four valve seats (4); the fuel injector sleeve (2) is provided around Cooling the injector and the inlet/exhaust cooling chamber (Id), the cooling chamber (Id) being located above the cooling water passage (lb) and communicating with the cooling water passage (lb) through the cooling water inlet (lc) A cooling water inlet (lc) is disposed near the injector casing (2); a cooling water outlet (le) for cooling water flowing out is provided at the top of the cooling chamber (Id).

2. The cylinder head cooling structure of a four-stroke engine according to claim 1, wherein the cooling water passage (lb) is located parallel to the bottom surface of the cylinder head (1).

3. The cylinder head cooling structure of a four-stroke engine according to claim 1, wherein the cooling water inlets (lc) have four in total, and they are evenly distributed around the injector casing (2) in the circumferential direction. The cooling water inlet (lc) is inclined from the bottom to the injector sleeve (2).

4. The cylinder head cooling structure of a four-stroke engine according to claim 1, wherein the cooling water passage (lb) is machined from a side of the cylinder head (1), and the outer end of the cooling water passage (lb) is filled with a bulkhead. (3) suffocating and blocking.