JPH0158363B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for assembling a boost pressure control device that operates a valve for suppressing boost pressure by bypassing exhaust gas passing through a turbine.

[Prior art]

A conventional device of this type is shown in FIG. In Fig. 1, 1 is the low pressure side case, 2 is the housing, 3 is the nipple, 4 is the bracket, 5 is the fixing bolt, 6 is the gasket, 7 is the plate, 8 is the spring, 9 is the rod that operates the valve, 1
0 is a diaphragm, 11 is a positive pressure side saucer, 12 is a spring saucer, 13 is a locking nut, and 14 is a stopper.

Next, its operation will be explained. The function of the boost pressure control device is that when the compressor boost pressure reaches the set boost pressure, the valve opens to prevent the turbine from overspeeding, and controls the opening of the bypass valve that releases excess exhaust gas directly to the exhaust system. It serves the purpose of

That is, first, in a desired engine operating state, by operating a positive pressure control means (not shown) that controls positive pressure to the positive pressure introduction nipple 3 in accordance with the engine operating state.
When positive intake pressure of the engine is introduced into the positive pressure case 1 from the nipple 3, this positive pressure acts on the diaphragm 10, and the diaphragm 10 moves the rod 9 in the direction of arrow A against the spring 8, as shown in the figure. Adjust the supercharging pressure in the suction pipe by releasing some of the exhaust gas that does not occur. On the other hand, when the positive pressure acting on the diaphragm 10 decreases, the biasing force of the spring 8 causes
Rod 9 moves in the opposite direction to close the exhaust pipe valve and cut off the flow of exhaust gas. In this manner, the rod 9 is moved to open and close the exhaust bypass valve depending on the magnitude of the supercharging air pressure, thereby controlling the amount of exhaust gas flowing into the engine and maintaining a constant supercharging pressure.

The present invention relates to a method for assembling a device having the structure and operation described above, and particularly to a method for adjusting and assembling the spring 8, the diaphragm 10, the case 1, and the housing 2.

Various assembly methods have been employed in the past. One method is to provide a part called a plate (not shown) and assemble the peripheral surface of the diaphragm with several bolts, but this leads to a greater variety of parts and an increase in costs in terms of ease of assembly.
Further, when assembling with bolts, it is difficult to control the tightening, and as a result, there is a drawback that characteristics such as non-uniformity in generated force and holding force of the diaphragm are likely to occur.

A commonly used method to eliminate this drawback is to insert and caulk a diaphragm between the housing and the case. This method involves incorporating a spring and diaphragm assembly built into the housing, compressing the spring using a jig, and simultaneously caulking the case, but the ease of assembly is determined by the amount of spring force. In other words, if the spring force is weak, it can be easily done by using the crimping jig as described above, but if the spring force is strong, the diaphragm may come off from its normal position when the diaphragm is crimped at the same time as the spring is compressed. There is also a problem that variations in characteristics are likely to occur, such as unevenness such as curling in the caulked portion and tearing. Furthermore, in order to satisfy these requirements, various types of assembly jigs are required, resulting in a problem of poor assembly performance. In short, if the spring force is strong, assembly is very difficult, so a stopper mechanism 14 as shown in FIG. 1 has been proposed.

That is, in the conventional device shown in FIG. 1, 14 is a stopper mechanism provided on the inner wall of the housing 2;
When assembling, after compressing the spring 8 and setting the diaphragm 10 to the normal fixed position, it is held by the stopper 14 and the end 2 of the housing 2 is
A is caulked and assembled to the case 1 with the circumferential surface 10a of the diaphragm 10 sandwiched therebetween. After caulking, the stopper 14 is removed and the compressed state of the spring 8 is released. However, this method has the disadvantage that the structure becomes complicated.

[Summary of the invention]

This invention was made to eliminate the above-mentioned conventional drawbacks, and instead of eliminating the conventional housing stopper 14, a protrusion is provided on the rod 9, and a protrusion is provided between the rod 9 and the housing. The assembly work can be easily performed by simply inserting the spacer.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. In FIG. 2, reference numeral 15 indicates a punching projection provided on the rod 9. The rest of the structure is the same as that shown in FIG. 1 above, except for the stopper 14, so a description thereof will be omitted.

Next, the assembly work will be explained. The spring 8 is compressed to set the diaphragm 10 to the normal fixed position. At this time, the rod 9 moves and a gap is created between the ejection protrusion 15 and the bottom surface of the housing 2. A spacer 16 is inserted into this gap to receive the elastic force of the spring 8, and in this state, the diaphragm 10 The peripheral edge of the holder is caulked and fixed in the same manner as shown in FIG.

〔Effect of the invention〕

As described above, according to the present invention, by a simple method of providing a protrusion on the rod and inserting a spacer between the protrusion and the housing,
This has the effect that the diaphragm caulking and fixing work can be done easily.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a conventional boost pressure control device.
FIG. 2 is a sectional view showing an embodiment of the present invention. In the figure, 1 is the low pressure side case, 2 is the housing, and 8
9 is a spring, 9 is a rod, 10 is a diaphragm, 11 and 12 are saucers, 15 is a protrusion, 16
is a spacer. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1: a low-pressure side case, a housing connected to this case, a diaphragm whose peripheral edge is fixed between the case and the housing, a spring housed in the housing via a saucer and urging the diaphragm toward the case; In the actuating rod that is connected to the diaphragm and passes through the housing, a protrusion is provided on the portion of the actuating rod that protrudes from the housing, and after compressing the spring and setting the diaphragm at the normal fixed position, A method for assembling a supercharging pressure control device, characterized in that a spacer is inserted into the gap between the protrusion and the bottom of the housing, and in this state, the peripheral edge of the diaphragm is sandwiched between the housing and the case and fixed by caulking. .