JPS6136750Y2 - - Google Patents

Description

[Detailed description of the invention] The disclosed technology is a sealing technology for an exhaust brake valve case and a rod connected to the pressure actuating body, which operates a pressure actuating body by negative pressure in the engine's intake manifold to shut off the exhaust pipe. belongs to the field of

Therefore, in this invention, a pressure actuating body such as a diaphragm installed in the case is actuated by intake manifold negative pressure, and a valve connected to the pressure actuating body via a rod opens and closes the exhaust vibe. This invention relates to an exhaust brake valve, in particular, a support cylinder integrally formed on the bottom of the case and a sliding portion of the rod connected to the pressure actuating body that slides on the support cylinder. The elastic sealing material installed allows the protrusions of the links and ribs to come into integral contact with the contact surface of the supporting tube and the inward presser plate of the supporting tube, and also lubricates the sliding surface of the rod. This invention relates to an exhaust brake valve that is integrally coated with a synthetic resin to reliably seal leaks from the intake manifold negative pressure, engine exhaust from the exhaust pipe, etc.

As is well known, large trucks are equipped with exhaust brakes to increase the effectiveness of engine braking, and when the accelerator pedal pressure is removed, the exhaust brake uses negative pressure in the intake manifold to stop the valve in the exhaust pipe. is closed, and the internal combustion engine acts as a compressor to enhance the effectiveness of engine braking.

A rod connecting a valve for opening and closing the exhaust pipe to a pressure actuating body such as a diaphragm on the other hand extends integrally into the bottom of the case housing the sliding pressure actuating body. A rubber packing as a sealing material is interposed in the sliding part of the molded support tube, but the packing is easily hardened and deformed by the high heat of the engine exhaust from the exhaust pipe, and also tends to adhere to the rod. The sliding surface of the packing against the rod may be damaged or worn due to the carbon scale, causing leakage of ink manifold negative pressure, engine exhaust gas, etc., and the packing has the disadvantage of having a significantly short lifespan.

The purpose of this invention is to solve the problems of the sealing material of the exhaust brake valve based on the above-mentioned conventional technology as a technical problem, and to solve the problem of the elastic sealing material on the support tube contact surface and the support tube's inward presser plate contact surface. The protrusions are integrally molded into contact with each other, and a lubricating resin is applied to the sliding surface of the rod to improve the sealing performance and durability of the elastic seal material. It is an object of the present invention to provide an excellent exhaust brake valve that can be useful in the field of exhaust brake application in the industry.

The structure of the invention is to utilize the negative pressure in the intake manifold when the engine brake is used to operate the pressure-actuating body in the case, and to transmit the operation of the pressure-actuating body to the rod that is integrated into the bottom of the case. When the support cylinder of the stretched form slides, leakage from the contact part side is prevented through each integrally molded protrusion of the support cylinder side contact part of the elastic sealing material interposed between the support cylinder and the rod, In addition, for rod sliding surfaces, a lubricating resin integrally attached to the elastic sealing material suppresses damage and wear of the elastic sealing material on the sliding surface and prevents leakage. sealability,
The gist of this is to improve durability.

Next, an embodiment of this invention will be described below based on the drawings.

In the embodiment shown in FIGS. 1 to 5, 1 is an exhaust brake valve, and a case 2 of the exhaust brake valve 1 has a diaphragm 3 as a pressure-actuating body stretched therein. A negative pressure communication pipe 4 that communicates with an intake manifold of an internal combustion engine (not shown) is connected to the lower side of the case 2 as a fluid communication pipe for operating the diaphragm 3, and an atmospheric communication hole 5 is connected to the upper surface of the case 2.
is drilled.

A rod 6 is connected to the diaphragm 3,
The lower part of the rod 6 is supported by a support cylinder 7 formed at the bottom of the case 2 so as to be able to slide vertically, and the rod 6 is supported by a support tube 7 formed at the bottom of the case 2 and is slidable in the vertical direction. A spring 10 is interposed between the rod 6 and a retainer 9 provided at the upper end of the rod 6 to constantly urge the diaphragm 3 upward.

The case 2 is appropriately fixed on the upper side of the mounting plate 11, and a coupler 12 is provided on the lower side of the mounting plate 11, and the coupler 12 is connected to the exhaust pipes 13, 13 of the internal combustion engine. The Calopr 12 has a gate section 14 communicating with the exhaust pipe 113 in the lower part thereof, and a valve guide 15 is formed in the upper part thereof. A plate-shaped valve 16 is slidably connected to the lower part of the rod 6 by appropriate means.

Further, as shown in FIGS. 3 to 5, a heat-resistant rubber packing 1 is provided at the sliding portion between the upper end of the support tube 7 and the rod 6 as an elastic sealing material, which is the gist of this invention.
A rib 17a is integrally formed on the upper surface of the hollow main body of the rubber packing 17, and a pair of ring-shaped protrusions 17b, 17b are integrally formed in a protruding manner, and a groove 17c is formed in the center of the lower surface of the hollow body.
is bored over the entire surface, and its rib portion 17d is brought into contact with the rod 6.

Furthermore, a Teflon resin 18 as a lubricating resin is integrally attached to the sliding surface of the opposing rod 6 on the inner circumference of the upper part of the rubber packing 17, and thus,
When the dust packing 17 is inserted into the support tube 7, the Teflon resin 18 is brought into contact with the rod 6, and the pair of ring-shaped protrusions 17
b, 17b are in contact with the support tube 7, and the rib 17a is in contact with the presser plate 19. It is locked.

In the above configuration, when the depression force of the accelerator pedal (not shown) is removed, the negative pressure generated in the intake manifold of the internal combustion engine is transmitted to the lower part of the case 2 of the exhaust brake valve 1 via the communication pipe 4, and thereby, The lower side of the diaphragm 3 has a negative pressure, and the upper side has equal atmospheric pressure due to the atmospheric communication hole 5, so that the diaphragm 3 has a spring 10
It descends against the urging force of.

Therefore, the rod 6 connected to the diaphragm 3 slides down inside the support tube 7, and the plate valve 16 connected to the lower end of the rod 6 is connected to the coupler 12.
As a result, the amount of engine displacement from the exhaust pipe 13 is suppressed, and the engine braking action by the internal combustion engine is enhanced.

Also, through the action of the diaphragm 3, the rod 6 slides into contact with the Teflon resin 18 and the lip portion 17d of the heat-resistant rubber packing 17 interposed in the upper part of the support tube 7. In addition to reliably sealing the attached carbon scale, etc., the exhaust gas from the exhaust pipe 13 is reliably sealed through the rib 17a of the rubber packing 17 and the pair of ring-shaped protrusions 17b, 17b, and the diaphragm is removed from the support cylinder 7. 3. Leakage of the exhaust gas into the interior of the exhaust gas is prevented.

As shown in FIG. 5, the rubber packing 17 hardens and contracts due to the high heat of the exhaust gas, and the pair of ring-shaped protrusions 17b and the support cylinder 7
Even if there is a gap between the contact surfaces, the leakage of exhaust gas from the support tube 7 into the diaphragm 3 will not occur due to the sealing action between the ribs 17a, the presser plate 19, and the contact portions.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment; for example, compressed air from a pump may be used instead of the intake manifold negative pressure, or the pressure actuating body may be mounted on a piston. Various embodiments can be adopted, such as.

As mentioned above, according to this invention, in an exhaust brake valve, the support cylinder integrally formed in the bottom of the case in which the pressure actuating body is housed and the rod connected to the pressure actuating body slide together. An elastic sill material interposed in the support tube has at least two links on the abutment surface of the support tube, and at least one rib on the inward presser plate abutment surface of the support tube, each of which is integrally molded with a protrusion. In addition, by integrally adhering a lubricating resin to the sliding surface of the rod, the elastic seal material hardens and contracts due to the high heat of the exhaust gas from the exhaust pipe, causing the link convexity of the elastic seal material to shrink. Even if there is a gap between the protruding part and the contact surface of the support cylinder, the contact part between the rib of the elastic sealing material and the holding plate will ensure a secure seal, completely preventing leakage of exhaust gas, etc. from the contact side of the support cylinder. An excellent effect can be achieved in preventing this.

In addition, carbon scale, etc. attached to the rod can be reliably sealed through the lubricating resin that is integrally attached to the rod sliding surface of the elastic sealing material, and the sliding resistance against the rod can be reduced by the lubricating resin. The size of the elastic seal material is reduced, the wear of the sliding portion of the elastic seal material is reduced, and the excellent effect of greatly improving the sealing performance and durability of the elastic seal material is achieved.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, and FIG. 1 is a front explanatory view showing the entire exhaust brake valve, FIG. 2 is an explanatory central longitudinal sectional view of FIG. 1,
FIG. 3 is an enlarged longitudinal sectional view showing the sealing portion of the rod, FIG. 4 is a half-sectional view of the sealing material, and FIG. 5 is an explanatory view of FIG. 3 over time. 2... Case, 3... Pressure operating body, 4... Fluid communication pipe, 6... Rod, 13... Exhaust pipe, 16... Valve, 1... Exhaust valve, 7... Support cylinder, 17... Elastic sealing material, 17
b...ring, 19...pressing plate, 17a...rib, 18...lubricating resin.

Claims (1)

[Scope of utility model registration request] A pressure operating body is housed inside the case, a fluid communication pipe for operating the pressure operating body is connected to the case, and a valve for opening and closing the exhaust pipe is connected to a rod connected to the pressure operating body. In the exhaust brake valve shown in FIG. At least two rings are integrally molded into contact with each other, and at least one rib is integrally molded into contact with the inward pressing plate of the support cylinder, and the sliding surface of the elastic seal material against the rod. An exhaust brake valve characterized in that a lubricating resin is integrally attached to the sealing material.