CN205823469U - A kind of cylinder of motorcycle engine assembly - Google Patents

Abstract

The utility model discloses a kind of cylinder of motorcycle engine assembly, including cylinder head body, rocker arm support and camshaft, cylinder head body and rocker arm support casting respectively, rocker arm support is mounted by means of bolts on cylinder head upper surface；Be respectively equipped with the arcuate groove of correspondence at cylinder head body upper surface and rocker arm support lower surface, described camshaft is arranged on lower arcuate groove and surrounds in formation circular channel and lie across directly over chain chamber.It is respectively provided with water cavity this internal being positioned at above two combustor of cylinder head, is positioned at each combustor at cylinder head body lower surface and is provided around some water inlets, in the middle part of this body side surface of cylinder head, be provided with outlet.This cylinder head assembly not only compact conformation, it is simple to the layout on Finished Motorcycle of motorcycle, and there is good radiating effect, by the way of split casting assembles again so that cylinder head self is easily processed, and is the most also beneficial to the installation of camshaft.

Description

A motorcycle engine cylinder head assembly

technical field

The utility model relates to a motorcycle engine, in particular to the improvement of the cylinder head structure of a motorcycle double-cylinder engine, and belongs to the technical field of the motorcycle cylinder head.

Background technique

The cylinder head is one of the very important key parts of the motorcycle engine. Its function is to form the working volume of the cylinder and guide the movement of the piston. It works under the conditions of high temperature, high pressure, poor lubrication, alternating load and corrosion. The cylinder head is provided with intake and exhaust passages for intake and exhaust. At the same time, the cylinder head is also equipped with a rocker arm bracket for installing a rocker arm and a spark plug for ignition. In order to increase the cooling area and ensure sufficient heat dissipation, many heat sinks are cast on its outer surface, and there are a large number of supporting ribs. For the cylinder head of a large-displacement twin-cylinder engine, the engine is required to be compact so as to facilitate the arrangement of the engine on the frame. The overall size of the engine is increased, which is unfavorable to the installation arrangement. If the size of the heat sink is reduced, although it is helpful for the compactness of the structure, the heat dissipation will be affected. At the same time, the structure of the cylinder head of the existing twin-cylinder engine is relatively complicated, and casting is very difficult. Because it is a twin-cylinder engine, the camshaft is relatively long, which also brings difficulties to the installation of the camshaft.

Utility model content

In view of the above-mentioned deficiencies in the prior art, the purpose of this utility model is to provide a motorcycle engine cylinder head assembly with compact structure, good heat dissipation and easy processing.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows:

A cylinder head assembly of a motorcycle engine, including a cylinder head body, a rocker arm bracket and a camshaft, two left and right arc-shaped pits are arranged on the lower surface of the cylinder head body to form two combustion chambers, and the cylinder head body is provided with a The two combustion chambers correspond to the intake port, exhaust port and spark plug; in the middle of the cylinder head body located between the two combustion chambers, there is a chain cavity through which the upper end is connected; the cylinder head body and the rocker arm bracket are cast separately, The rocker arm bracket is fixed on the upper surface of the cylinder head body by bolts; corresponding arc-shaped grooves are respectively provided on the upper surface of the cylinder head body and the lower surface of the rocker arm bracket, and the camshaft is installed on the upper and lower arc-shaped grooves to form a circular channel Centered and crossed directly above the chain cavity. In this structure, the cylinder head body and the rocker arm bracket are separately cast and then assembled into one body, which reduces the difficulty of casting and facilitates the installation of the camshaft.

In the cylinder head body, there are water chambers located above the two combustion chambers. The two water chambers are located on the left and right sides of the chain chamber. On the lower surface of the cylinder head body, there are several water inlets around each combustion chamber. The water inlets pass through water channels and The water cavities on the respective sides are connected; a water outlet is provided in the middle of the side of the cylinder head body, and the two water cavities are respectively connected to the same water outlet through water channels. The cylinder head assembly changes the existing air cooling to water cooling, reduces the size of the heat sink, has a compact structure, and has better cooling effect at the same time. The same water outlet is used to lead out the coolant, which further makes the structure more compact.

The water outlets and the intake passages of the two combustion chambers are located on the same side of the cylinder head body; the exhaust passages of the two combustion chambers are located on the other side of the cylinder head body corresponding to the intake passages, and the outlets of the exhaust passages of the two combustion chambers are separated in the form of Figure 8 layout.

The cylinder head body adopts low-pressure casting, so that the combustion chamber has a rough surface, which can increase the surface area of the combustion chamber and better ensure the fuel atomization effect.

In a word, the improved motorcycle engine cylinder head assembly of the utility model not only has a compact structure, is convenient to be arranged on the motorcycle vehicle, but also has a good heat dissipation effect. Through separate casting and reassembly, the cylinder head itself Easy to process, but also conducive to the installation of the camshaft.

Description of drawings

Fig. 1 - the longitudinal sectional view of the motorcycle engine cylinder head assembly of the utility model.

Fig. 2 - the top view of the motorcycle engine cylinder head assembly of the utility model.

Fig. 3 - the transverse sectional view of the motorcycle engine cylinder head assembly of the utility model.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Referring to Fig. 1-Fig. 3, as can be seen from the figure, the utility model motorcycle engine cylinder head assembly is a double-cylinder engine cylinder head, including cylinder head body 1, rocker arm bracket 2 and camshaft 3, in cylinder head body 1 The lower surface is provided with two left and right arc-shaped pits to form two combustion chambers 4, and the cylinder head body 1 is provided with an intake port 5, an exhaust port 6 and a spark plug 7 corresponding to the two combustion chambers. In the middle of the cylinder head body 1 between the two combustion chambers, there is a chain cavity 8 through which the upper end passes. In order to reduce casting difficulty, the cylinder head body 1 and the rocker arm bracket 2 are respectively casted, and then the rocker arm bracket 2 is fixedly installed on the upper surface of the cylinder head body 1 by bolts 9 . In order to install the camshaft, the upper surface of the cylinder head body and the lower surface of the rocker arm bracket are respectively provided with corresponding arc-shaped grooves, and the camshaft is installed in the circular passage formed by the upper and lower arc-shaped grooves and is transverse to the chain cavity. The utility model separately casts the cylinder head body 1 and the rocker arm bracket 2 and then assembles them into one body, which simplifies the overall complex castings through separate design and processing, reduces the difficulty of casting, and also facilitates the installation of the camshaft.

In order to reduce the size of the heat sink to make the structure more compact without reducing the heat dissipation effect, the utility model is provided with a water chamber 10 above the two combustion chambers 4 in the cylinder head body 1, and the two water chambers 10 are located on the chain On the left and right sides of the chamber 8, several (six in the embodiment) water inlets 11 are provided on the lower surface of the cylinder head body 1 around each combustion chamber. The water port corresponds to the cooling water outlet on the upper surface of the cylinder block. A water outlet 12 is provided in the middle of the side surface of the cylinder head body 1, and the two water chambers 10 communicate with the same water outlet 12 through water channels respectively. The cylinder head assembly changes the existing air cooling to water cooling, which can not only reduce the size of the cooling fins and make the structure compact, but also have a better cooling effect under the joint action of the cooling water and the cooling fins. In addition, the same water outlet is used to lead out the cooling liquid, which further makes the structure more compact.

The water outlet 12 and the intake passage 5 of the two combustion chambers are located on the same side of the cylinder head body 1; the exhaust passages 6 of the two combustion chambers are located on the other side of the cylinder head body 1 corresponding to the intake passage, and the exhaust passages of the two combustion chambers are located on the other side of the cylinder head body 1 corresponding to the intake passage. The outlets of the air passage 6 are arranged separately in a figure-eight shape. The cylinder head on the side where the intake port is located has a relatively low temperature because the air entering it is normal-temperature air and has an air-cooling effect, and the temperature of the cooling water coming out through the cooling cycle rises, so the water outlet is arranged at the same place as the intake port. side, which ensures an even and consistent cooling effect.

The cylinder head body 1 adopts low-pressure casting, so that the combustion chamber has a rough surface, and microscopically, many small protrusions are formed on the surface, which can increase the surface area of the combustion chamber and better ensure the fuel atomization effect. At the same time, the lower surface of the cylinder head body and the combustion chamber are transitioned through a circular arc, which can avoid stress concentration more than the existing 45° chamfer.

In a word, the improved motorcycle engine cylinder head assembly of the utility model not only has a compact structure, is convenient to be arranged on the whole motorcycle, but also has a good heat dissipation effect. The method of separate casting and reassembly makes the cylinder head itself easy to process, and also facilitates the installation of the camshaft.

The above-mentioned embodiments of the utility model are only examples for illustrating the utility model, rather than limiting the implementation of the utility model. For those of ordinary skill in the art, other variations and modifications in various forms can be made on the basis of the above description. All the implementation manners cannot be exhaustively listed here. All obvious changes or variations derived from the technical solutions of the utility model are still within the scope of protection of the utility model.

Claims (4)

1. A motorcycle engine cylinder head assembly, comprising a cylinder head body, a rocker arm bracket and a camshaft, two left and right arc-shaped pits are arranged on the lower surface of the cylinder head body to form two combustion chambers, and the cylinder head body is provided with There are intake ports, exhaust ports and spark plugs corresponding to the two combustion chambers; in the middle of the cylinder head body located between the two combustion chambers, there is a chain cavity through which the upper end is connected; it is characterized in that: the cylinder head body and the rocker The arm brackets are respectively cast and formed, and the rocker bracket is fixed on the upper surface of the cylinder head body by bolts; corresponding arc-shaped grooves are respectively provided on the upper surface of the cylinder head body and the lower surface of the rocker bracket, and the camshaft is installed on the upper and lower arc-shaped The grooves are enclosed to form a circular channel and cross the chain cavity directly above; In the cylinder head body, there are water chambers located above the two combustion chambers. The two water chambers are located on the left and right sides of the chain chamber. On the lower surface of the cylinder head body, there are several water inlets around each combustion chamber. The water inlets pass through water channels and The water cavities on the respective sides are connected; a water outlet is provided in the middle of the side of the cylinder head body, and the two water cavities are respectively connected to the same water outlet through water channels. 2. The motorcycle engine cylinder head assembly according to claim 1, characterized in that: the water outlet and the intake ports of the two combustion chambers are located on the same side of the cylinder head body; the exhaust ports of the two combustion chambers are located on the same side as the intake port On the other side of the cylinder head body corresponding to the air passage, the outlets of the exhaust passages of the two combustion chambers are separated and arranged in a figure-eight shape. 3. The motorcycle engine cylinder head assembly according to claim 1, wherein the combustion chamber has a rough surface to increase the surface area of the combustion chamber. 4. The motorcycle engine cylinder head assembly according to claim 1, characterized in that: the lower surface of the cylinder head body and the combustion chamber are transitioned through a circular arc.