JPS6210450Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a blind plug for negative pressure piping for engine adjustment.

Recently, many devices for controlling exhaust gas and improving performance of internal combustion engines (hereinafter referred to as engines) for automobiles are operated using engine negative pressure. These negative pressure operating devices are connected to the negative pressure generating portion of the engine by negative pressure piping, but when inspecting or adjusting the engine and these negative pressure operating devices, it is necessary to remove the negative pressure piping from the negative pressure operating device. However, when some negative pressure piping is removed, it is necessary to close the connecting end of the negative pressure piping to the negative pressure actuator, and the operator must close the connecting end of the negative pressure piping with an appropriate blind plug. The ends were blocked. However, for this purpose, it is necessary to always have a considerable number of suitable blind plugs on hand, and if a blind plug is lost, it is necessary to replenish that number, which is troublesome.

This invention aims to eliminate the above-mentioned drawbacks in conventional negative pressure piping.

This invention will be explained below based on drawings showing embodiments. FIG. 1 shows a first embodiment of this invention in a diaphragm type negative pressure operating device. In the figure, 1 indicates a diaphragm type negative pressure operating device, 2 is a casing, 3 is a diaphragm, 4 is an operating rod, 5 is a return spring, 6 is an atmospheric pressure chamber, and 7
is a negative pressure chamber; 8 is a connecting pipe provided in the casing 2 on the side of the negative pressure chamber 7; one end communicates with the negative pressure chamber 7, and the other end connects to a negative pressure generating part of the engine (not shown) via a negative pressure pipe 9. It's communicating. Reference numeral 10 denotes a round bar-shaped blind stopper whose outer diameter is approximately equal to the inner diameter of the negative pressure pipe 9.

When the negative pressure piping 9 is removed from the connecting pipe 8 for adjustment or inspection of the engine or the negative pressure operating device 1, the negative pressure piping 9 is temporarily fitted into the blind plug 10. As a result, the engine or the negative pressure operating device 1 can be inspected and adjusted without atmospheric air being sucked in from the negative pressure pipe 9.

FIG. 2 shows a second embodiment of this invention. In the figure, the blind plug 10 is a diaphragm type negative pressure actuator 1.
The second embodiment is the same as the first embodiment except that it is attached to the casing 2 on the negative pressure chamber 7 side.

3a to 3e show the shape and mounting position of the blind plug 10, and Fig. 3a shows the case where the round rod-shaped blind plug 10 is mounted on the connecting pipe 8 close to the negative pressure actuator 1. This is to prevent incorrect piping when re-piping.

FIG. 3b shows a configuration in which angle-shaped blind plugs 11 are attached side by side to the connecting pipe 8, which has the effect of preventing incorrect piping when re-piping.

In FIG. 3c, the solid blind plug 10 in FIG. 3a is replaced with a pipe-shaped blind plug 12, which does not communicate with the inside of the connecting pipe 8.

FIG. 3d shows a blind plug 10 having a different length from the bent portion 8a of the connecting pipe 8 to prevent incorrect piping when re-piping.

The blind plug 13 shown in FIG. 3e is obtained by cutting the end of the blind plug 12 shown in FIG. 3c diagonally to avoid mis-piping with the connecting pipe 8.

Note that either the connecting pipe 8 or the blind plugs 10 to 13 may be coated to avoid incorrect piping when re-piping.

As mentioned above, this idea attaches a blind plug to the casing and connecting pipe of the negative pressure actuator, and when inspecting or adjusting the engine or negative pressure actuator, the negative pressure piping for the negative pressure actuator is connected to the connecting pipe of the negative pressure actuator. Since it is removed from the body and temporarily fitted into the blind plug, work efficiency such as inspection and adjustment of engines and negative pressure operating devices is significantly improved compared to the conventional case of using a blind plug as a single unit. do.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the first embodiment of this invention;
Figure 2 is a longitudinal sectional front view of the second embodiment, Figures 3 a to e
2A and 2B are diagrams each showing a connection between a blind stopper and a connecting pipe of a negative pressure operating device. 1... Negative pressure actuation device, 2... Casing, 8...
...Connection pipe, 9...Negative pressure pipe, 10, 11, 12,
13...Blind plug.

Claims (1)

[Scope of utility model registration request] Temporarily fitting the connecting end of the negative pressure piping on the negative pressure actuating device side to a part of the negative pressure actuating device that is connected to the negative pressure generating part of the engine and operated by the negative pressure of the engine. A blind plug for negative pressure piping for engine adjustment, characterized by the provision of a blind plug.