JP2008144692A - Fuel gallery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a fuel gallery arranged on a fuel supply device of an engine to cope with various kinds of engines inexpensively by using a main part of a constituting component as a component for common use. <P>SOLUTION: In this fuel gallery 1A for distributing and supplying a fuel sent out from a fuel tank to each cylinder of the engine by a plurality of injectors 3 arranged in series, a connection pipe 52 for connecting each injector housing 50 holding the injector 3 is treated as a separated component connectable to the injector housing 50 by keeping the airtight and fluid-tight state between the inside and the outside, and a connection pipe 52 having a length fit to an injector mounting pitch of an engine to be applied is used, to thereby enable to cope with a plurality of kinds of engines by using the injector housing 50 as a component for common use. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to each cylinder of an engine through injectors that are respectively arranged so that fuel such as gasoline and liquefied petroleum gas delivered from a fuel tank by pressure from a fuel pump is matched with intake manifolds of a plurality of engines arranged in series. The present invention relates to a fuel gallery of a fuel supply device that distributes and supplies fuel to a vehicle.

  In the engine fuel supply device, a fuel gallery that distributes fuel delivered by a fuel pump to each cylinder of the engine while maintaining a predetermined pressure is provided in each injector 3 disposed in the intake manifold of the engine as shown in FIG. A special connection pipe 82 having a length that exactly matches the pitch dimension of the fuel gallery 1B is prepared by welding and connecting the plurality of injector housings 80 holding the injectors 3 by welding means. Is generally known.

  Similarly, the inlet pipe 42 for introducing the fuel into the fuel gallery 1B is manufactured by using dedicated parts according to the mounting requirements for each type of engine. As described above, the fuel gallery in the fuel supply apparatus needs to produce dedicated parts corresponding to the type of engine to be installed.

  However, in the case of an engine with a small production quantity or the like, manufacturing each fuel gallery matched to the shape of the intake manifold leads to an increase in manufacturing cost. For this reason, it has been desired that most of the parts constituting the fuel gallery are shared parts and the dedicated parts are minimized.

  In order to solve this problem, the injector arm and the common rail of the injector are directly connected in a state where a metal gasket having a spherical outer peripheral surface is in contact with a conical tapered surface formed to face each port of each fuel passage. Japanese Patent Application Laid-Open No. 2000-297723 discloses a technique for directly connecting the injector and the injector while absorbing the misalignment.

According to the means presented in this publication, fluctuations in the position of the injector mounting hole of the intake manifold can be absorbed to some extent, but this technology is a technology for connecting the common rail and the injector arm, This is a structure that is difficult to adopt, and the absorption of deviation by this metal gasket assumes a relatively small deviation width, and can sufficiently cope with the fluctuation of the intake manifold pitch dimension that occurs between engine types. It is not possible.
JP 2000-297723 A

  The present invention is intended to solve the above-described problems, and for a fuel gallery arranged in an engine fuel supply device, the main parts of the constituent parts are used as common parts in a variety of low-cost engines. The challenge is to be able to respond.

  Therefore, the present invention provides a fuel gallery for distributing and supplying fuel delivered from a fuel tank to each cylinder of an engine with a plurality of injectors arranged in series in accordance with an injector mounting pitch of the engine to be applied. The connecting pipe for connecting each other is a dedicated part having a length connectable to the adjacent injector housings while maintaining a gas / liquid tight state, and the injector mounting pitch of the intake manifold using the injector housing as a shared part It is possible to handle multiple types of engines with different

  In this way, the easy-to-manufacture and relatively inexpensive connection pipe is used as a dedicated part, and the relatively expensive injector housing is used as a shared part, so that the injector mounting pitch that is arranged to match the intake manifold of the engine can be changed. Can be easily handled.

  In particular, the connection between the injector housing and the connecting pipe is carried out by inserting the end of the connecting pipe into the connecting hole provided on the outer peripheral side of the body of the injector housing. By disposing a predetermined sealing means between the two, the assembly can be facilitated while ensuring the gas / liquid tightness in the fuel gallery.

  Further, in the fuel gallery described above, the fuel pipe tip side is fitted and connected to the connection hole of one end side injector housing, and the connection hole of the other end side injector housing is sealed by a predetermined sealing means, In addition, if it is assumed that a retaining metal fitting that prevents the connected fuel pipe from being removed from the connection hole is attached, a structure for connecting the fuel pipe while making the injector housing all the same common parts. Can be simplified.

  Further, the retaining metal fittings are substantially U-shaped for fixing a substantially ring-shaped horizontal portion inserted into the lower portion of the injector housing from below and a flange extending in a centrifugal direction from the outer periphery of the tip of the fuel pipe by a predetermined fixing means. If it is a horizontal view substantially L-shaped metal fitting provided with a shape-like vertical portion, the fuel pipe can be easily removed by being attached from below the injector housing and screwed or the like.

  According to the fuel gallery of the present invention, the fuel gallery which is the main part of the constituent parts can be used as a common part, and can easily cope with various kinds of engines at low cost.

  In the following, the best mode for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 1, the fuel gallery 1A includes injector housings 50 and 50 connected to each other by connecting pipes 52. , 50, that is, the installation interval of the injector 3 in the intake manifold of the engine to be applied.

  In the present embodiment, the connecting pipe 52 that connects the adjacent injector housings 50, 50 is not welded to the injector housing 50, but is a separate part. The first feature is that it is a common part that can be used in

  In other words, only the connecting pipe 52 having a very simple configuration in which the connecting portions 52a and 52a as connecting structures having a predetermined diameter are provided on both ends of the pipe member is attached to the injector 3 corresponding to the predetermined engine to be applied. As a dedicated part that is a part having a width, the manufacturing cost of the fuel gallery 1A is extremely low, and it can be easily applied to various types of engines.

  The connecting portions 52a and 52a on both ends of the connection pipe 52 have an outer diameter that is smaller than that of the main body and substantially matches the inner diameter of the connection hole 50a of the injector housing 50, and is made of an O- By inserting the rings 50b and 50b into the connection holes 50a, the adjacent injector housings 50 and 50 can be reliably connected to each other while maintaining the air / liquid tight state inside and outside.

  Further, a fuel delivery pipe from a fuel tank (not shown) is connected to the connection hole 50a of the injector housing 50 on one end side of the fuel gallery 1A, and a fuel pipe which is a tip side part of the fuel delivery pipe. Reference numeral 40 denotes a part having a length and shape according to the arrangement state of the engine, and is manufactured as a dedicated part having a substantially L-shaped shape as shown in the figure.

  In order to prevent the fuel pipe 40 from being removed from the fuel gallery 1A, a point where the retaining metal fitting 60 is provided is a second characteristic portion. That is, as shown in the perspective view of FIG. 2, the retaining metal fitting 60 has an inner circumference equivalent to the lower outer circumference of the injector housing 50 and is provided with a substantially ring-shaped horizontal portion 61 for insertion from below. Further, a U-shaped vertical portion 62 having screw holes 62a and 62a for fixing the flange 41 extending in the centrifugal direction from the outer periphery of the front end of the fuel pipe 40 and having screw holes 41a and 41a with screws 100 and 100 or the like is provided. Thus, the shape is substantially L-shaped in horizontal view.

  The retaining bracket 60 is mounted from below the injector housing 50, and the screw holes 62a, 62a of the vertical portion 62 and the screw holes 41a, 41a on the fuel pipe 40 side are aligned with screws 100, 100, bolts and nuts, etc. By fixing, the fuel pipe 40 can be easily connected so that it cannot be removed. Further, by fixing and locking at two places in this way, the fuel pipe 40 can be prevented from rotating.

  Further, the fuel gallery 1A can be easily provided with a safety valve 70 as shown in FIG. 3 or a non-illustrated mecha plug on the end side opposite to the portion where the fuel pipe 40 is inserted. In addition, by fixing the portion provided with the screw hole with the retaining metal fitting 60 in the same manner as described above, these can be easily made undetachable.

  As described above, the fuel gallery 1A can be easily assembled by connecting the injector housings 50 and 50, which are one kind of parts, with the connecting pipe 52 having a length corresponding to the engine to be applied. Accordingly, only one type of injector housing 50, which is a relatively expensive component, is manufactured and used as a shared component, and only a relatively inexpensive connection pipe 52 is manufactured as a dedicated component, thereby reducing the manufacturing cost. It becomes easy to apply many kinds of engines without raising the price.

  The fuel gallery 1A of the present embodiment has connection holes 50a and 50a on both ends thereof, and therefore, by selecting components to be connected to these, the non-return type fuel supply device and the return type fuel supply device It can be applied to both, and is highly versatile.

  As described above, according to the present invention, the fuel gallery arranged in the fuel supply device of the engine can be used for various kinds of engines without increasing the manufacturing cost by using the main parts constituting the fuel gallery as common parts. It was.

The longitudinal cross-sectional view which shows embodiment of this invention. The perspective view of FIG. The perspective view which shows the case where a safety valve is provided in the fuel gallery of FIG. A fuel gallery in a conventional fuel supply system.

Explanation of symbols

1A fuel gallery, 3 injectors, 40 fuel pipes, 41 flanges, 41a, 62a screw holes, 50 injector housings, 50a connection holes, 50b O-rings, 52 connection pipes, 52a connection parts, 60 retaining brackets, 61 horizontal parts, 62 Vertical section, 70 Safety valve, 100 screw

Claims (3)

A plurality of injector housings having injectors at their tips are arranged at predetermined intervals so as to arrange the injectors in an intake manifold of an engine arranged in series at predetermined intervals, and the adjacent injector housings Are connected by connecting pipes, and the fuel delivered from the fuel tank is supplied to one injector housing, and is distributed / supplied to the other injector housings by the connecting pipe, and fuel is supplied from the injectors of each injector housing to each intake manifold of the engine. In the fuel gallery that injects each
Each of the injector housings is a common part, and a connecting pipe for connecting the injector housings is a dedicated part having a length connectable to adjacent injector housings, and the injector housing and the connecting pipe The end of the connecting pipe is inserted into a connecting hole provided on the outer peripheral side of the body portion of the injector housing, and a predetermined seal is provided between the inner peripheral side of the connecting hole and the outer end of the connecting pipe. A fuel gallery characterized in that means are arranged.   The fuel pipe tip side is fitted and connected to the connection hole of the injector housing on one end side, the connection hole of the injector housing on the other end side is sealed with a predetermined sealing means, and the connected fuel pipe is The fuel gallery according to claim 1, wherein a retaining metal fitting is attached to the connection hole so as not to be removed. The retaining metal fitting is a substantially U-shape that fixes a substantially ring-shaped horizontal portion inserted into the lower portion of the injector housing from below and a flange extending in a centrifugal direction from the outer periphery of the tip of the fuel pipe by a predetermined fixing means. The fuel gallery according to claim 1, wherein the fuel gallery is an approximately L-shaped metal fitting in a horizontal view including a vertical portion.

Images