JP2005226606A - Injector for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injector for an internal combustion engine, not requiring variation in a solenoid valve 2 even when an engine is different in type, and reducing the stock of defective solenoid valves 2 to a change in number of the respective engines produced. <P>SOLUTION: The solenoid valve 2 has a housing 5 to which a spacer member 6 is fitted, the outside diameter of the housing 5 is larger than the outside diameter of a connector part 8 provided on the housing 5, and the solenoid valve 2 is larger than the outside diameter of a retaining nut 3 fixed to an injector body 1. Accordingly, the spacer member 6 is fitted to the outer periphery of the housing 5 through the outside the connector part 8 or the outside of the retaining nut 3. In this arrangement, it is not necessary to integrate the spacer member 6 with the solenoid valve 2, so that even if the engine is different in type, only the spacer member 6 is varied to make the solenoid valve 2 in common. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an injector for injecting fuel into an internal combustion engine.

For example, an injector described in Patent Document 1 includes a retaining nut 120 that fixes the solenoid valve 100 to the injector body 110 as shown in FIG. 4, and a spacer portion that is provided integrally with the retaining nut 120. 130 has a sealing function. That is, the spacer portion 130 is liquid-tightly fitted on the outer periphery of the housing of the solenoid valve 100 via the O-ring 140 and is fitted liquid-tightly on the injector mounting hole formed in the engine head 150 via the gasket 160. This prevents the engine oil from leaking outside.
JP 2003-97378 A (see FIG. 2)

Normally, the engine head 150 in which the injector mounting hole is formed differs depending on the type of engine, and the inner diameter of the injector mounting hole is often different. As a result, it is necessary to prepare the retaining nuts 120 having different outer diameters of the spacer portions 130 for the types of engines.
However, in the above-described injector, the outer diameter of the connector part 170 is larger than the inner diameter of the spacer part 130. Therefore, before the connector part 170 is formed (generally resin-molded), the retaining nut 120 is placed in advance in the electromagnetic valve It is necessary to assemble to 100. In other words, the retaining nut 120 is integrated with the solenoid valve 100 because it cannot be assembled with the connector portion 170 formed.

  Therefore, when the type of engine is different (the inner diameter of the injector mounting hole is different), only the retaining nut 120 cannot be replaced. As a result, the retaining nut 120 having a different outer diameter can be used. The number of types of solenoid valves 100 increases with the type. In this way, having many variations in the solenoid valve 100 is not only wasteful from the viewpoint of productivity and cost, but also has a lot of stock for fluctuations in the production quantity of each engine, and conversely The problem that it becomes easy to invite shortage occurs.

  The present invention has been made on the basis of the above circumstances, and its purpose is not to give many variations to the solenoid valves even when the types of engines are different, and to change the production quantity of each engine. On the other hand, an object of the present invention is to provide an injector for an internal combustion engine that can reduce defective inventory of electromagnetic valves.

(Invention of Claim 1)
The present invention has a solenoid valve that is fixed to the upper portion of the injector body by a retaining nut, and a ring-shaped spacer member that is provided separately from the retaining nut and fits around the housing of the solenoid valve. The electromagnetic valve is an injector attached to the internal combustion engine via the spacer member, and the outer diameter of the housing into which the spacer member is fitted is such that the spacer member can be assembled from below or above the electromagnetic valve. It is provided.

  According to the above configuration, the spacer member provided separately from the retaining nut can be assembled from below or above the solenoid valve and fitted to the outer periphery of the housing of the solenoid valve. Therefore, the spacer member is integrated with the solenoid valve. There is no need. As a result, even when the types of engines are different, only the spacer member can be replaced to cope with it, so that the solenoid valves can be shared. As a result, it is possible to cope with fluctuations in the production quantity of each engine only by fluctuations in the inventory of the spacer members, so that the defective inventory of the solenoid valves can be greatly reduced. In addition, design changes such as injector performance improvements can be handled simultaneously for all models.

(Invention of Claim 2)
2. The injector for an internal combustion engine according to claim 1, wherein the solenoid valve is provided with a connector portion above the housing, and the outer diameter of the housing is larger than the maximum outer diameter of the connector portion. To do.
According to this configuration, the inner diameter of the spacer member is inevitably larger than the maximum outer diameter of the connector portion. Therefore, even when the connector portion is formed on the electromagnetic valve, the spacer member is placed on the connector portion side (above the electromagnetic valve). ) And can be fitted to the outer periphery of the housing.

(Invention of Claim 3)
The injector for an internal combustion engine according to claim 1, wherein the outer diameter of the housing is larger than the outer diameter of the retaining nut.
According to this configuration, since the inner diameter of the spacer member is inevitably larger than the outer diameter of the retaining nut, the spacer member is assembled from the retaining nut side (below the solenoid valve) and fitted to the outer periphery of the housing. be able to.

  The best mode for carrying out the present invention will be described in detail with reference to the following examples.

FIG. 1 is a cross-sectional view showing an injector mounting structure for an internal combustion engine.
In the injector shown in the first embodiment, an electromagnetic valve 2 is mounted on an upper portion of an injector body 1, and the electromagnetic valve 2 is fastened and fixed to the injector body 1 by a retaining nut 3.
The electromagnetic valve 2 has a cylindrical case 4 that accommodates an exciting coil (not shown) and the like, and a tightening force of the retaining nut 3 is applied to a flange portion 4 a provided on the outer periphery of the case 4. ing.

A housing 5 having an outer diameter larger than that of the flange portion 4 a is provided above the case 4, and a spacer member 6 is fitted and assembled to the outer periphery of the housing 5. Further, a connector portion 8 for holding a terminal 7 connected to the exciting coil is provided above the housing 5.
The outer diameter of the housing 5 into which the spacer member 6 is fitted is larger than the outer diameter of the connector portion 8 and larger than the outer diameter of the retaining nut 3.

The spacer member 6 is made of metal and has a ring shape. For example, the spacer member 6 is fitted into the outer periphery of the housing 5 in a press-fitted state, so that the space between the spacer 5 and the housing 5 is liquid-tightly sealed, and the cylinder head 9 of the internal combustion engine. A sealing function for preventing engine oil from leaking to the outside is provided by fitting into a mounting hole 9a provided in the above through a gasket 10.
The spacer member 6 is provided separately from the retaining nut 3 and is fitted to the outer periphery of the housing 5 with respect to the electromagnetic valve 2 through the outside of the connector portion 8 or the outside of the retaining nut 3. be able to.

(Effect of Example 1)
In the injector described in the first embodiment, the outer diameter of the housing 5 is larger than the outer diameter of the connector portion 8 and larger than the outer diameter of the retaining nut 3. The housing 5 can be assembled from the lower side (retaining nut 3 side) or the upper side (connector portion 8 side) and fitted to the outer periphery of the housing 5. That is, the spacer member 6 can be fitted to the outer periphery of the housing 5 through the outside of the connector portion 8 even after the electromagnetic valve 2 is fixed to the injector body 1 with the retaining nut 3. Further, before the solenoid valve 2 is fixed to the injector body 1 with the retaining nut 3, it can be fitted to the outer periphery of the housing 5 through the outside of the retaining nut 3.

  According to said structure, since it is not necessary to integrate the spacer member 6 with the solenoid valve 2, even if the kind of engine differs, only the spacer member 6 can be varied according to the size (inner diameter) of the mounting hole 9a. The solenoid valve 2 can be shared. As a result, it is possible to cope with fluctuations in the production quantity of each engine only by fluctuations in the inventory of the spacer member 6, so that the defective inventory of the electromagnetic valves 2 occupying most of the cost can be greatly reduced. In addition, design changes such as injector performance improvements can be handled simultaneously for all models.

  In the first embodiment, the outer diameter of the housing 5 is larger than the outer diameter of the connector portion 8 and larger than the outer diameter of the retaining nut 3. However, the outer diameter of the connector portion 8 and the retaining nut are described. It may be larger than either one of the three outer diameters. For example, when the connector portion 8 is provided at a position offset from the center of the electromagnetic valve 2, the spacer member 6 may not be assembled from the connector portion 8 side. On the other hand, if the outer diameter of the housing 5 is larger than the outer diameter of the retaining nut 3, the spacer member 6 can be assembled from the retaining nut 3 side. Even when the outer diameter of the retaining nut 3 is larger than the outer diameter of the housing 5, the spacer member 6 can be assembled from the connector portion 8 side if the outer diameter of the housing 5 is larger than the outer diameter of the connector portion 8. is there.

  In the first embodiment, the example in which the spacer member 6 is press-fitted to the outer periphery of the housing 5 has been described. However, the spacer member 6 has a slight gap on the outer periphery of the housing 5 even if the press-fitting is not used. After the fitting, the fitting gap with the housing 5 may be joined by welding or the like and sealed all around. Further, the spacer member 6 may be assembled to the housing 5 with screws.

FIG. 2 is a cross-sectional view showing an injector mounting structure for an internal combustion engine.
The injector shown in the second embodiment is an example in which the spacer member 6 is fitted to the outer periphery of the housing 5 with a slight gap, and the fitting gap between the spacer member 6 and the housing 5 is sealed by the O-ring 11. . The structure of the solenoid valve 2 is the same as that of the first embodiment. When the engine type is different (when the inner diameter of the mounting hole 9a is different), only the spacer member 6 is provided with a variation so that the solenoid valve 2 is common. Can be achieved.

FIG. 3 is a cross-sectional view showing an injector mounting structure for an internal combustion engine.
The injector shown in Example 3 is an example when the spacer member 6 is formed of an elastic body such as rubber. In this case, since the space between the mounting hole 9a and the spacer member 6 can be liquid-tightly sealed by press-fitting the spacer member 6 into the mounting hole 9a, the gasket 10 described in the first embodiment (see FIG. 1) is used. Can be abolished. Similarly, by press-fitting the spacer member 6 to the outer periphery of the housing 5, the space between the spacer member 6 and the housing 5 can be sealed in a liquid-tight manner, as in the case where the metal spacer member 6 is used. A sealing structure such as welding or an O-ring is not required.
The structure of the solenoid valve 2 is the same as that of the first embodiment. When the engine type is different (when the inner diameter of the mounting hole 9a is different), only the spacer member 6 is provided with a variation so that the solenoid valve 2 can be shared. Can be achieved.

It is sectional drawing which shows the attachment structure of an injector (Example 1). (Example 2) which is sectional drawing which shows the attachment structure of an injector. (Example 3) which is sectional drawing which shows the attachment structure of an injector. It is sectional drawing which shows the attachment structure of an injector (prior art).

Explanation of symbols

1 Injector body 2 Solenoid valve 3 Retaining nut 5 Housing 6 Spacer member 8 Connector

Claims (3)

The solenoid valve is fixed to the upper portion of the injector body by a retaining nut, and has a ring-shaped spacer member that is provided separately from the retaining nut and fits on the outer periphery of the housing of the solenoid valve. An injector attached to the internal combustion engine via a spacer member,
The injector for an internal combustion engine, wherein the solenoid valve is provided with an outer diameter of a housing into which the spacer member is fitted such that the spacer member can be assembled from below or above the solenoid valve. . The injector for an internal combustion engine according to claim 1,
An injector for an internal combustion engine, wherein a connector portion is provided above the housing, and the outer diameter of the housing is larger than the maximum outer diameter of the connector portion. The injector for an internal combustion engine according to claim 1,
An injector for an internal combustion engine, wherein the solenoid valve is provided with an outer diameter of the housing larger than an outer diameter of the retaining nut.

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