EA042361B1 - HAND PUMP FOR INTERNAL COMBUSTION ENGINE FUEL SYSTEMS - Google Patents

Description

Field of invention

The present invention relates to hand pumps for fuel systems of internal combustion engines.

State of the art invention

Currently, a large number of pumps are known for use in internal combustion propulsion systems.

From patent CS 22298, a fuel pump is known for multi-cylinder injection internal combustion engines, in particular for motor vehicles.

From another patent, CS 54403, a fuel injection pump for internal combustion engines is known, the pumping cylinders of which, or steel housings enclosing cylindrical inserts, are built into the pump housing made of light metal.

Also in CS 72182 is a pressurized lubrication pump. This pump consists of a container and a non-twistable back cover from which the lubricant is pushed out by a piston by rotating a stationary adjusting screw by means of a handle, the pushing cylinder being mounted on a drive screw passing through a groove along the pump casing, which is the drive spring of a support sleeve mounted in back cover of the pump with the possibility of rotation.

Another patent, CS 82199, shows a pressure lubrication pump. This pump is equipped with a single inlet and multiple oil flow ports in a rotating piston cylinder, and the piston rod in combination with a radial port acts as an oil distributor, and the pump cylinder is equipped with radial flow ports arranged in a spiral.

From CS 263549 a carburetor accelerator pump guide is known, including a piston located within the main supply system, which is regulated by a jet located in the guide. In the piston of the cylinder in the direction of its axis between the upper and lower surfaces there is one or more channels.

The main disadvantage of the above constructive solutions is that they have a relatively complex structure due to their manufacture from materials consisting of different metals, the processing of which is quite difficult.

The object of the present invention is to provide a pump of a simplified design, made from a material that allows for much easier processing and thereby a significant reduction in cost while maintaining or improving functionality.

Invention principle

The above drawbacks are advantageously eliminated, and the objects for the present invention are carried out by means of a manual pump for fuel systems of internal combustion engines, including an outer housing and a movable piston located in its cavity, the design of which according to the present invention is based on the presence of at least one retaining ring between the outer housing and piston; while the outer housing, piston and retaining ring are made of plastic of the same type, and between the outer housing and the piston there is at least one sealing collar fixed in the piston, which is made of fluorosilicone. The advantage of this design is that the use of plastic for the manufacture of the main parts of the pump makes it possible to simplify and reduce the cost of production, while at the same time providing a wide variety of shapes of these parts. An additional advantage is the installation of at least one sealing collar between the outer housing and the piston, which is mounted on the piston and provides the additional benefit of using fluorosilicone. Another advantage is the excellent functionality even under extreme temperature fluctuations, and an important design element is that it is non-metallic. The retaining ring serves to accurately guide the piston along the cavity of the outer housing.

In the most preferred embodiment, the outer housing, piston and circlip are made from polyamide.

The advantage is that the outer housing and the piston are made of transparent plastic. It also has the advantage that the contents of the pump cavity can be determined without the use of other sophisticated measuring devices.

It also has the advantage that movement of the piston along the threads in the cavity of the outer casing is prevented. The thread is a part that belongs to both plastic molds and is fully functional.

An additional advantage is that a rubber support ring is mounted on the piston head, resting on the front of the outer housing. The back-up ring provides the greatest benefit from the use of fluorosilicone.

For better detection of the pump in the engine compartment, the outer housing is made of blue plastic, and the piston is orange.

The pump according to the present invention allows to organize extremely simple, fast, cheap and productive production. Another advantage is the variety of forms. An added benefit is excellent performance in high temperature ranges.

- 1 042361 and, therefore, associated with this preservation of integrity. The design of the pump of the present invention to some extent eliminates the technical prejudice that non-metallic materials cannot be used in extreme environments, for example, in the Arctic regions of Russia, where there are large temperature differences and where internal combustion engines are used.

Drawing overview

A more detailed description of the invention will be presented using the drawings, of which FIG. 1 is a detailed view of the location of individual parts of the pump in cross section; fig. 2 is a front view of the piston head and FIG. 3 and 4 are perspective views of the pump design.

Examples of embodiments of the invention

Hand pump for fuel systems of internal combustion engines (Fig. 1-4), such as diesel engines for large trucks, which includes an outer casing 1, in the cavity 4 of which the piston 2 is movably mounted.

The outer casing 1 is made of blue plastic and the piston 2 is made of orange plastic, the plastic being polyamide in both cases. As an alternative, the outer casing 1 and the piston 2 can be made of transparent plastic, also represented by polyamide.

The movement of the piston 2 is stopped by a thread 3 located in the cavity 4 of the outer housing 1.

Between the outer casing 1 and the piston 2 there is a rubber sealing collar 5 fixed on the piston 2 and made of green fluorosilicone.

Between the outer housing 1 and the piston 2 there is also a retaining ring 6 attached to the outer housing 1, which is made of polyamide.

On the head 7 of the piston 2, a support ring 8 is installed, which rests on the front part 9 of the outer housing 1, which is made of green fluorosilicone rubber.

On the end surface 13 of the head 7 of the piston there are grooves 10.

On the end surface 14 of the outer housing 1 there is a thread 11 ending in a groove 12 in which the sealing ring 15 is installed.

Behind the groove 12 on the outer body 1, a cast part 17 is installed, on which the hexagon 16 is located.

Industrial Application

The pump according to the present invention can be used as a pump for fuel systems of internal combustion engines, in particular for diesel engines of heavy vehicles operating in extreme climatic conditions.

List of reference items:

- outer casing

- piston,

- carving,

- cavity,

- sealing clamp

- retaining ring

- head,

- support ring

- front end,

- grooves,

- carving,

- groove,

- the front of the head,

- the front part of the outer casing,

- sealing ring,

- hexagon

- cast part.

Claims (7)

CLAIM 1. A hand pump for the fuel system of an internal combustion engine, comprising an outer housing (1) with a movable piston (2) installed in its cavity (4), characterized in that at least one is installed between the outer housing (1) and the piston (2). a retaining ring (6) attached to the outer housing (1), wherein the outer housing (1), the piston (2) and the retaining ring (6) are made of the same type of plastic, and between the outer housing (1) and the piston (2) at least one fluorosilicone sealing collar (5) attached to the piston (2). 2. Hand pump according to claim 1, characterized in that the outer casing (1), the piston (2) and the retaining ring (6) are made of polyamide. - 2 042361 3. Hand pump according to claim 1, characterized in that the outer casing (1) and the piston (2) are made of transparent plastic. 4. A hand pump according to any of the preceding claims, characterized in that the piston (2) is locked by a thread (3) located in the cavity (4) of the outer casing (2). 5. A hand pump according to any one of the preceding claims, characterized in that a rubber support ring (8) is mounted on the head (7) of the piston (2), which rests on the front part (7) of the outer housing (1). 6. Hand pump according to claim 5, characterized in that the ring (8) is made of fluorosilicone. 7. Hand pump according to claim 1, characterized in that the outer casing (1) is made of blue plastic and the piston (2) is orange.