JPS58106143A - Exhaust brake device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To increase a pumping loss and improve an exhaust brake effect, by arranging the effective pipe length of a pair of exhaust flow passages, which collect exhaust from plural cylinders to guide the exhaust to an exhaust brake valve part, to a specific value. CONSTITUTION:Exhaust manifolds 3, 4 are communicated to exhaust flow lines 6, 7 and guided to an exhaust brake valve part 5. An effective pipe length of the lines 6, 7 is selected to the length in which pulsation acted with pressure in the vicinity of an exhaust valve as the positive pressure is generated when the exhaust brake is applied. In this way, when the exhaust brake is applied, the positive pressure generated in a location of exhaust ports increases a pumping loss, and an exhaust brake effect can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Braking performed by closing a valve provided in an exhaust pipe is called an exhaust brake, and is widely employed in large freight vehicles, large buses, etc. equipped with diesel engines.

The object of the present invention is to improve the braking effect of the exhaust brake for an in-line four-cylinder engine, an in-line six-cylinder engine, or a V-type machine with four or more cylinders per bank.

Figure 1 is a diagram showing the conventional structure of an in-line six-cylinder engine.As shown in this figure, the exhaust brake valve (11 is the valve immediately after the exhaust manifold (2) collects the exhaust gas from the six cylinders) in the conventional type. On the other hand, the device according to the present invention is shown in FIGS. 2 and 3, and the difference between this device and the device shown in FIG. 1 is 1VkLi-
The exhaust manifold (3) that collects the exhaust gas from the cylinders of Nn3 and the exhaust manifold (4) that collects the exhaust gas from the cylinders of the 4th cylinder and 1llk16 are the exhaust brake valve part (
5), and a pair of separated exhaust flow paths +61 +71 (m 1-11k15 cylinders with Umako exhaust flow path and The exhaust flow path belonging to the cylinder No. 4-1616 is assumed to have an effective pipe length that generates a pulsation that makes the pressure near the exhaust valve a positive pressure when the exhaust brake valve (8) is closed.

The ignition order of an in-line six-cylinder engine is 1-5-3-6-2-4 or 1-4-2-6-3-5, and the three cylinders belonging to the exhaust flow path (6) (hereinafter referred to as the first group) ).
and three cylinders belonging to the exhaust flow path (7) (hereinafter referred to as the second cylinder).
Regarding the cylinders of the group 0), when the exhaust port of one of the three cylinders is opened, the exhaust ports of the other two cylinders are closed, which occurs cyclically, and the exhaust flow path +6) The above pulsation that occurs in (7) occurs when the exhaust brake is applied under the condition that the engine is operating at high speed, and when the exhaust brake is applied to the cylinders of the first group and the second group The generated positive pressure increases the pumping loss and improves the exhaust braking effect.In the case of an automobile diesel engine, the above-mentioned high-speed operating condition is, for example, when the engine speed is 170
It is in a state of about 0-200 ORPM.

The illustrated embodiment is for an in-line 6-cylinder engine, but in the case of an in-line 4-cylinder engine, the ignition order (1-3-2-4
Or taking into account l-4-2-3), divide the cylinders into two cylinders belonging to the first group and two cylinders belonging to the second group, so that the cylinders belonging to the first group perform exhaustion alternately. At the same time, the cylinders belonging to the second group are arranged to exhaust air alternately, and the position of the exhaust brake valve and the effective pipe length of the pair of flow paths leading to the valve may be selected in the same manner as in the case of an in-line six-cylinder engine. In addition, regarding the V-B engine, which is thought to be a combination of two in-line 4-cylinder engines, and the V-12 engine, which is considered to be a combination of two in-line 6-cylinder engines,
An exhaust system and an exhaust brake valve are provided in the same manner as an in-line four-cylinder engine and an in-line six-cylinder engine, respectively.

An exhaust brake device that performs braking by increasing pumping loss by closing the exhaust flow path is usually installed in the configuration shown in Figure 1, and the pressure state at the exhaust port is However, the present invention takes into consideration the pressure state of this part and prevents the outflow of exhaust gas even more than the pressure state.

In the illustrated embodiment, the exhaust manifold (3) for the first group of cylinders and the exhaust manifold (4) for the second group of cylinders are separate, and the exhaust from the exhaust manifolds +31 and +41 is separated and flowed. Although the pipe line t91 ill that leads to the exhaust brake valve part (5) is also considered to be separate, in reality, the exhaust manifold +31 +41 and the pipe line +91 Got are integrated, and they have an appropriate partition wall. It is desirable that the exhaust valve be constructed in such a way that its external appearance is not much different from the conventional one, except for the position of the exhaust brake valve and the number of pipe joints.

[Brief explanation of drawings]

FIG. 1 is a side view of a conventional exhaust brake device, FIG. 2 is a side view of an exhaust brake device according to the present invention, and FIG. 6 is a cross-sectional view of the exhaust brake valve portion of the exhaust brake device shown in FIG. (1)...Exhaust brake valve (2)...Exhaust manifold +31 f4+...Exhaust manifold (5)
...Exhaust brake valve part +6+ +71...Exhaust flow path (8)...Exhaust brake valve +9111...Pipe line

Claims (1)

[Claims] In-line 4-cylinder engine, in-line 6-cylinder engine, or a combination of these in a V8 engine or a V12 engine in an in-line arrangement
- A pair of exhaust gases that are guided to the exhaust brake valve section with the exhaust flow path of the cylinder f or 6 cylinders divided into two, and that collect exhaust gas from the 2 or 6 cylinders and guide it to the exhaust brake valve section. The effective pipe length of the flow path is selected to be such that when the exhaust brake is applied under the condition that the engine is in a high-speed operating state, a pulsation is produced that makes the pressure at the exhaust port a positive pressure. Exhaust brake equipment for internal combustion engines.