Engine brake for a multi-cylinder internal combustion engine

Details Engine brake for a multi-cylinder internal combustion engine Engine brake for a multi-cylinder internal combustion engine

1996-10-18

1997-12-16

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

123321, F01L 1306

Patent

active

056973365

DESCRIPTION:

BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION

The present invention is based on an engine brake intended for a multi-cylinder internal combustion engine in which, outside the exhaust stroke of a working piston, in particular at the end of the compression stroke, a decompression valve can be actuated by pressurization of hydraulic cylinders, and which has the features set forth in the preamble to claim 1.
Such an engine brake is known from Federal Republic of Germany 41 38 447 A1. The radial piston pump used there as source of pressurizing agent has a rotor which can be driven by the internal combustion engine and within which several radial pistons are arranged, guided radially. Each radial piston rests radially on the outside on an eccentric element, fixed on the housing, having a cam curve by which a forward and backward representation is impressed on it when the rotor rotates. Within the housing of the known pump for an engine brake, a distributor unit attached, fixed for rotation, to the rotor is arranged in the form of a single distributor disk. For the pressurization and depressurization of the hydraulic pistons of the decompression valves the pump has control outputs which lie axially opposite the distributor disk and are connected alternately via it with a high-pressure zone and a low-pressure zone of the pump when the rotor rotates. The known engine brake also includes a valve via which the high-pressure zone, when braking is not effected, can be connected directly to the low-pressure zone of the pump so that no high pressure builds up. The pump is then merely entrained by the internal combustion engine, in which connection, however, the entraining power is more than the amount desired because of the externally supported radial pistons and because of the size and the weight of the rotor. Furthermore, the rotor is of rather complicated construction and accordingly expensive to manufacture.


SUMMARY OF THE INVENTION

The object of the present invention is therefore further to develop the radial piston pump of an engine brake having the features set forth in the preamble to claim 1 in such a manner that, outside of braking operation, it requires only a slight entrainment power and that it can be manufactured at a more favorable cost.
This object is obtained in accordance with the invention for an engine brake which has the features set forth in the preamble of claim 1 in the manner that said engine brake also has the remaining features set forth in claim 1. In the case of such an engine brake, therefore, the radial pistons of the pump are internally supported so that, due to the smaller lever arm, the moment of resistance produced by the frictional force and thus the necessary entrainment power are only slight, even in the case of a mere sliding motion between the eccentric element and the radial piston. The rotor is reduced to the drive shaft and the eccentric moved by it and is therefore very simple to manufacture. The pressurized fluid is not to be transferred either in low pressure or in high pressure into or out of the rotor. The pump housing has a first housing section with said at least one radial piston and a space for the eccentric, and a second housing section having the control outputs. The reverse supporting of the radial pistons and the possibility inherent therein of simplifying the rotor and reducing the entrainment power is obtained in the manner that the distributor unit now has two sealed distributor disks which are displaceable axially with respect to each other. A first one of these two distributor disks can be pressed against the first housing section and thereby separates a first pressure zone within the first housing section from a second pressure zone between the two housing sections from each other. The second distributor disk can be pressed axially against the second housing section and connects a control output in this second housing section in each case to only one of the two pressure zones. In this connection, of course, it also separates the two pressure zones from each other.

REFERENCES:
patent: 5257605 (1993-11-01), Pawellek et al.

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