The object of the present invention is a new valve with an overhead inverted seat and inverted camshaft of an internal combustion engine, so that improvements in its general performance are obtained.

There are known different types of valves used in internal combustion engines. These valves generally have a series of deficiencies in their functioning and performance. One of the most common deficiencies is the breakdown of the valve in the shaft unheading device, and that in certain cases and, depending on the type of valve, it can result in the breakdown of pistons, rods and head.

Another effect known are the problems derived from the breakdown of the drive chain-belt where, in general, there is a general breakdown of the engine due to the normal constitution of internal combustion engines, where the valves are in contact with the pistons.

In the known valves, the breakdown of the springs maintaining the valves pressed causes a general failure in the engine, including its breakdown.

In order to solve the aforementioned problems, the overhead inverted seat valve and inverted camshaft are presented for all kinds of internal combustion engines. This valve comprises, at least:

• an overhead inverted seat, where the supporting base of the valve is located inside the intake and exhaust nozzles,
• valve with inverted seat on the outer face opposite to the rod,
• a rod, generally with a greater diameter than conventional valves and also shorter,
• a spring, being only located in the intake valve, and which is generally under smaller pressure than in conventional systems known in the state of the art,
• a system supporting cartridge, which facilitates the mounting and dismounting of the valve without any need of dismounting the engine head,
• a camshaft with inverted round cam with a flat surface for actuating the valves, which enable to run and give opening and closing time without problems.

The functioning of the valve is based on its opening and closing by the eccentricity of the camshaft, keeping the closing on the head seat, by the circular diameter of the eccentric movement, enabling to open the valve, when the plane thereof allows the valve to open. In the escape valve no spring is required since the piston compression is used after the explosion to open the valve to the passage of the camshaft opening, and closing this opening with it, although a low pressure spring can be mounted to help speeding up the opening. In the case of the intake, this opening will be performed by a spring which will help the opening passage of the eccentric movement.

From this constitution and functioning the following advantages are derived:

• It prevents the valves from breaking down when the shaft is not working, due to its reinforcement possibility in the camshaft, and since the valve head would not go inside the cylinder.
• There is no contact between the valves and the pistons, therefore in case the drive chain-belt breaks down, the engine would stop but it would not break down.
• It improves the friction between the different elements forming the valve and the engine assembly.
• The combustion performance is much more efficient, since the gases are not found in their intake path in the intake, as in the exhaust with the valve axis. It is possible to make the opening as wide as desired without the problem affecting the piston.
• The pistons do not have to have their heads with extreme forms, they can be flat, since, as there is no valve problem in the cylinder, the problem derived from the configuration does not exist, nor does its compression or gas sweeping.

The following is a brief description of a series of drawings which will help understand the invention better relating to an embodiment of said invention which is presented as a non-limiting example thereof.

• Figure 1 is a schematic plan view of the valve object of the present invention

As it can be seen in the attached figure, the valve object of the invention comprises, at least:

• an overhead inverted seat (7), where the supporting base of the valve (6) is located inside the intake and exhaust nozzles (3),
• valve (6) with inverted seat on the outer face opposite to the rod,
• a rod (2), generally with a greater diameter than conventional valves and also shorter,
• a spring (4), being only located in the intake valve, and which is generally under smaller pressure than in conventional systems known in the state of the art,
• a system supporting cartridge (5), which facilitates the mounting and dismounting of the valve without any need of dismounting the engine head,
• a camshaft (1) with inverted round cam with a flat surface for actuating the valves, which enable to run and give opening and closing time without problems.

The functioning of the valve is based on the opening and closing by the eccentricity of the camshaft, keeping the closing on the head seat, by the circular diameter of the eccentric movement, enabling to open the valve, when the plane thereof allows the valve to open. In the escape valve no spring is required since the piston compression is used after the explosion to open the valve to the passage of the camshaft opening, and closing this opening with it, although a low pressure spring can be mounted to help speeding up the opening. In the case of the intake, this opening will be performed by a spring which will help the opening passage of the eccentric movement.