JP3062289B2 - 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 so as to block exhaust gas emission during a steep descent and to reduce the amount of exhaust gas. The present invention relates to a cylinder device of an exhaust brake device that gives a braking 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, is extremely easy to manufacture, does not require honing or surface treatment as a 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-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 is connected to the housing. A slide-type exhaust brake device which is engaged with a tip of a piston rod penetrating a bottom wall of an air cylinder connected to an end to open and close a valve member with respect to an exhaust passage by reciprocating movement of the piston rod . Mosquito
Tighten the bar and bottom wall with a fastening member to fix the cylinder
The air cylinder,
Flow of cooling water between the cover and the bottom wall.
To form a water jacket leading to the doorway
Composed of two substantially concentric cylinders spaced apart from each other,
And seal packing of at least the piston member of the inner cylinder
Honing or drawing is applied to the sliding range of the
The inner cylinder is a honing tube cut to the required length.
Tube or drawn tube, or anodized coating or hard cloth
Honing tube with surface treatment such as plating
It consists of a drawn tube.

[0006]

According to the present invention, the water jacket is formed of two substantially concentric cylinders which are spaced apart from each other, and at least the inner cylinder is formed as follows.
It consists of a hollow long material with a honing tube or drawn tube whose inner peripheral surface has been preliminarily honed or drawn and surface-treated as necessary, cut into required lengths, and treated with an end surface. It can be manufactured simply by incorporating it into the wall together with the outer cylinder via a sealing member, so that the manufacturing cost can be reduced, and thermal imbalance occurs between the cylinders due to the separate inner and outer cylinders. However, since the cylindrical body is effectively cooled by the cooling water in the water jacket, the concentration of thermal stress is prevented, so that the sliding of the piston member is smoothly performed continuously over a long period of time, and the seal packing is prevented. Thermal deterioration can be prevented, and a function that is highly adaptable at the time of 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) is connected to the end of the housing through the bottom wall (4 '), and an air cylinder having a cover (4) at the top is provided. The piston rod (6 ') of the piston member (6) of the cylinder has the valve member (3) fixed thereto near its tip. The air cylinder (5) has a water jacket covering the cylindrical wall of the cover (4) and the bottom wall (4 ') forming a partition and the cover and the bottom wall. Substantially concentrically spaced apart from each other to form (11)
It is composed of two cylinders (5 ') and (5 ") of one length .

[0008] These two cylindrical bodies (5 ') and (5 ") are formed by hot-extrusion of an aluminum alloy material and then cold-drawing, or by cold-drawing an iron material. However, it is preferable to use the same material in consideration of the difference due to thermal expansion, and the two cylinders can be obtained very easily by cutting a hollow long material into a required length. (5 ") is for example a honing tube or a honing tube which has been subjected to honing or drawing in advance on the inner peripheral surface of a hollow long material made of aluminum alloy, and further subjected to surface treatment such as anodic oxide coating treatment or hard chrome plating if necessary. The drawn tube is cut to the required length and subjected to end face treatment.
(7) is seal packing, (8) and (9) are piston rods (6 ')
And a seal member provided on the bottom wall (4 ') portion through which the wire extends. (10) is a coil spring in the air cylinder (5), and (12) is a cylinder with the cover (4) and the bottom wall (4 ') tightened.
(5 '), a plurality of tie bolts as fastening members for fixing (5 "), (13) is an inflow / outflow port of cooling water provided outside connected to the water jacket (11), (14), (15) Is two cylinders (5 '),
(5 ") and a sealing member between the cover (4) and the bottom wall (4 '), and (16) is a quick exhaust device provided on the outer top of the cover (4) of the air cylinder (5). The solid arrows indicate the direction of the exhaust gas flow in the flow passage (2).

[0009]

As described above, the cylinder device of the slide type exhaust brake device according to the present invention comprises two substantially concentric cylinders provided at a distance from each other so as to form a water jacket (11). (5 ') and (5 ") to form a cylindrical wall and at least an inner cylindrical body (5") with a honing or drawing process applied to the inner peripheral surface of a hollow elongated material or a drawing tube The pipe can be cut to the required length and treated with an end face, and can be easily assembled with the cover (4), bottom wall (4 '), tie bolts (12), sealing members (14) and (15). In addition, even if a thermal imbalance occurs between the separate cylinders (5 ') and (5 "), the cylinder wall can be connected to the intermediate water jacket (1).
1) It can be effectively cooled by the cooling water inside to prevent the generation of thermal stress, and therefore the piston member can be
(6) Sliding operation can be performed smoothly and smoothly, and at the same time, heat deterioration of the seal packing can be prevented, and a function that is highly responsive at the time of braking can be exhibited.Honing processing as post-processing This is a very useful cylinder device for a slide type exhaust brake device that can eliminate or eliminate surface treatment.

[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 showing a conventional example.

[Explanation of symbols]

 Reference Signs List 4 cover 4 'bottom wall 5 air cylinder 5', 5 "cylinder 7 seal packing 11 water jacket 12 tie bolt 13 outflow inlet 14, 15 seal member

Continuation of 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] An exhaust baffle provided in an exhaust passage of an engine.
A plate-shaped valve member is installed inside the housing of the
An air syringe having the valve member connected to an end of the housing
Exhaust by engaging the tip of the piston rod that penetrates the bottom wall of the
Reciprocating movement of piston rod for opening and closing operation of valve member with respect to flow passage
The slide type exhaust brake device
And tighten the cover and the bottom wall with the fastening
In the cylinder device in which
Cover the cylinder wall of the cylinder (5) with the cover (4) and the bottom wall, respectively.
(4 ') and the cooling water outlet (13)
Spaced from each other to form a water jacket (11)
Composed of two substantially concentric cylinders (5 ') and (5 ")
And at least the piston member (6) of the inner cylinder (5 ″)
Honing processing or sealing in the sliding range of the seal packing (7)
After drawing, the inner cylinder (5 ") is cut to the required length.
Cut honing tube or drawn tube or positive
Surface treatment such as extreme oxide coating and hard chrome plating
Characterized by a honing tube or drawn tube
Sliding exhaust brake device cylinder device.