JP3062288B2 - Cylinder device of sliding exhaust brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a large vehicle such as a bus, a truck, or a construction vehicle, which is provided in the middle of an exhaust pipe of an engine to block exhaust gas discharge during a steep descent to brake the vehicle. The present invention relates to a cylinder device of an exhaust brake device that provides an effect.

[0002]

2. Description of the Related Art Conventionally, as a cylinder device of this kind of exhaust brake device, the rise in exhaust temperature and the temperature at the end of the exhaust brake device have been remarkable due to the recent increase in speed and output. As shown in FIG. 2, in order to prevent thermal deformation of the cylinder and thermal deterioration of the seal packing, a thick portion of the cylindrical wall (25 ') formed by the air cylinder (25)
A hollow portion was formed by using a core in a sand mold, and this was used as a water jacket (21). Incidentally, (26) is a piston member, which reciprocally slides when braking the vehicle,
(26 ') is a piston rod, and (27) is a seal packing.

[0003]

However, in such a conventional technique, a water jacket (21) is formed by using a sand core in a thick portion of the cylindrical wall (25 '). It takes time and effort to form the core, such as holding the core at the time and removing the core sand after casting.If the core sand is not sufficiently removed, sand is mixed into the cooling water and the engine There is a problem that the mechanical seal and impeller of the water pump may be damaged.In addition, the inner peripheral surface of the air cylinder (25) provided with such a water jacket is individually bored and then subjected to honing processing. There has been a tendency to have problems such as remarkably impairing productivity, for example, by performing a surface treatment such as an oxide film treatment.

The present invention has been made in view of the above-mentioned problems of the prior art, and is extremely easy to manufacture, does not require horning or surface treatment as post-processing, and has a thermal deformation of a cylinder and a heat of a seal packing. An object of the present invention is to propose a water-cooled cylinder device of a slide type exhaust brake device capable of preventing deterioration and exhibiting smooth operation for a long period of time.

[0005]

According to the present invention, a plate-like valve member is provided inside a housing of an exhaust brake body interposed in an exhaust passage of an engine, and the valve member is connected to an end of the housing. An exhaust brake device, which is engaged with a tip end of a piston rod penetrating a bottom wall of an air cylinder connected to a portion and performs opening and closing operations of a valve member with respect to an exhaust flow passage by reciprocating movement of the piston rod. An annular groove formed in the inner wall of the cylinder;
And a cylinder device of a slide-type exhaust brake device, which comprises a water jacket connected to an outflow / inflow port of external cooling water. The cylindrical body is further provided at least over the sliding range of the seal packing of the piston member, and the cylindrical body is formed of a honing tube or a drawn tube cut to a required length, and further a honing tube or a drawing tube as necessary. The drawn tube is subjected to a surface treatment such as hard chrome plating or anodized film treatment.

[0006]

According to the present invention, a honing tube or drawn tube having a hollow elongate material whose inner peripheral surface has been previously subjected to honing or drawing and, if necessary, further surface treatment, can be used for a required length. in the cylindrical body subjected to end face treatment by cutting, merely incorporating through a seal et yer cylinder having an annular groove on the inner peripheral wall surface can form the water jacket, can the manufacturing cost cheaper, and another Even if a thermal imbalance occurs between the air cylinder and the air cylinder due to the cylindrical body, the cylindrical wall is free to undergo thermal deformation to prevent the generation of stress as much as possible, and therefore, the sliding of the piston member for a long period of time. In addition to smooth movement, the seal packing can be prevented from being thermally degraded, and a function that is highly responsive during braking can be exhibited.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a slide type exhaust brake device according to the present invention, wherein (1) is a housing of an exhaust brake main body. A plate-like valve member extending in a direction substantially perpendicular to a flow passage (2) having an outer wall protruding a connecting wall portion with an exhaust pipe (not shown) of an engine.
An air cylinder (5) made of, for example, aluminum casting is connected to the end of the housing through the bottom wall (4), and the piston of the air cylinder is connected to the end of the housing. The piston rod (6 ') of the member (6) has the valve member (3) fixed thereto near the distal end thereof. (7) is a seal packing provided on the outer peripheral surface of the piston member (6),
(8) and (9) are a bush and a seal member provided on the bottom wall (4) through which the piston rod (6 ') passes. (10) is a coil spring in the air cylinder (5), (11) is an annular groove (5a) formed in the cylinder wall of the air cylinder (5) and a separate cylinder (12) covering the groove. And a water jacket made of cooling water. And the separate cylinder
(12) In the present invention, the inner peripheral surface of the aluminum alloy hollow long material is subjected to honing or drawing in advance,
Further, if necessary, a honing tube or a drawn tube which has been subjected to a surface treatment such as hard chrome plating or an anodic oxide film treatment is cut into a required length and subjected to an end surface treatment. The water jacket (11) can be easily formed by incorporating the thus prepared separate cylinder (12) into the air cylinder (5) via the sealing member (12 '). The cylinder (12) is provided over the sliding range of the seal packing (7) of the piston member (6). (13) is a cooling water outflow / inlet provided outside connected to the water jacket (11), and (14) is a quick exhaust valve device provided at the outer top of the air cylinder (5).

In the drawing, solid arrows indicate the direction of the flow of exhaust gas in the flow passage (2).

[0009]

Cylinder device sliding exhaust brake system according to the present invention described above, according to the present invention is the e Ja cylinder (5) in having the inner peripheral wall surface <br/> annular groove (5a), a hollow elongated Separate cylindrical body (12) that has been subjected to honing processing and desired surface treatment on the inner peripheral surface of the material, cut to a predetermined length, and subjected to end surface treatment
The jacket (11) by incorporating through a seal
Can easily be configured, and even if a thermal imbalance occurs between the separate cylinder and the air cylinder, the cylinder wall can be freely thermally deformed and effectively prevent stress from being generated. The sliding of the piston member (6) can be smoothly performed continuously over a long period of time, and at the same time, the heat deterioration of the seal packing can be prevented, and the quick response function at the time of braking can be exhibited.
Furthermore, since the formation of the water jacket (11) is easy as described above, the manufacturing cost is low, and the cylinder device of the slide-type exhaust brake device is extremely useful because honing and surface treatment as post-processing can be omitted. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a slide type exhaust brake device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway longitudinal sectional view of a main part of a conventional example.

[Explanation of symbols]

 Reference Signs List 5 air cylinder 5a annular concave groove 6 piston member 7 seal packing 11 water jacket 12 cylinder 13 outflow / inlet

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02D 9/06 F02D 9/14 F15B 15/14 F16K 31/122

Claims (1)

(57) [Claims] 1. A plate-shaped valve member is provided inside a housing of an exhaust brake main body interposed in an exhaust passage of an engine, and the valve member penetrates a bottom wall of an air cylinder connected to an end of the housing. In the exhaust brake device, which is engaged with the distal end of the piston rod and opens and closes the valve member with respect to the exhaust flow passage by reciprocating movement of the piston rod, an annular groove formed in the inner wall of the cylinder of the air cylinder (5). (Five
a) and a separate cylindrical body (12) fitted inside the cylinder to cover the concave groove, and an inflow / outflow port of external cooling water.
A water jacket (11) connected to (13) is provided and configured .
The cylinder (12) is sealed at least with a piston member (6).
Provided over the sliding range of the packing (7),
2) is a honing tube cut to the required length or drawn
Tube or hard chrome plating or anodic oxide coating
Honing tube or drawn tube with surface treatment
A cylinder device for a slide type exhaust brake device , characterized in that: