JPH01113518A - Engine provided with mechanical supercharger - Google Patents

Abstract

PURPOSE:To enable an engine to be subjected to high supercharge even in its low speed running state so as to reduce the driving loss of a supercharger in the case of partially loaded operation by driving the supercharger via a varable pulley mechanism to reduce the internal compression work of the supercharger during its partially loaded operation. CONSTITUTION:A pulley ratio between a drive pulley 8 and a driven pulley 10 is controlled by means of a variable pulley mechanism 5 so that a supercharger 6 may be operated at a high rotational speed in the low speed range of An engine. A control valve 51 is controlled by means of a controller 52 in the case of partial load and pressure oil is supplied in the second chamber 47 of a cylinder means 42. Then, a piston rod 43 and a piston 45 move and the valve member 41 of a leaf valve means 33 comes in position P1 for throttling the intake air so that the quantity of intake air absorbed in the supercharger 6 may be restricted. Thus, the internal work of the supercharger 6 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine equipped with an internal compression type mechanical supercharger.

(Conventional technology) Generally, in order to significantly improve torque in the low rotation range, it is necessary to provide high supercharging, but with a turbocharger, it is difficult to obtain high supercharging in the low rotation range, so the machine It is necessary to use a type supercharger.

Internal compression type mechanical superchargers are known as mechanical superchargers suitable for such high supercharging (for example, Utility Model Publication No. 53-1
(See Publication No. 1686).

(Problem to be solved by the invention) However, in order to achieve high supercharging, it is necessary to rotate the mechanical supercharger at high speed even in the low engine speed range. Since they are linked using pulleys, increasing the rotation speed in the low rotation range will cause drive loss in the high rotation range, and in some cases the maximum allowable rotation speed will be exceeded, resulting in a large amount of discharged air. Otherwise, there is a risk of engine damage.

Is it also used as a control during partial load? ! ! Magnetic clutch clutch-in, off, and air bypass control suffer from shock when the clutch is engaged.

This problem becomes especially serious when a mechanical supercharger with an internal compression function suitable for high supercharging is used.

The present invention has been made in view of these points, and is equipped with a mechanical supercharger that can perform high supercharging from a low engine speed range and can reduce drive loss of the supercharger at partial load. It provides engines.

(Means for solving the problem between molds) In order to achieve the above object, the present invention provides that an internal compression type mechanical supercharger is driven through a variable pulley mechanism, while the supercharger is driven at a partial load. The present invention is characterized by having an internal compression work reducing means for reducing the internal compression work of the compressor.

(Function) The supercharging characteristics at full load are controlled by the variable pulley mechanism, while the supercharging characteristics at partial load are controlled by the internal compression work reduction means.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1 showing the overall configuration of a mechanical supercharged engine, 1 is a four-cylinder engine body, and its intake system includes, from the upstream side, an air flow meter 2, a throttle valve 3, and a crankshaft 4 of the engine body 1. An internal compression type mechanical supercharger 6 and a fuel injection valve 7 which are driven by a centrifugal variable pulley mechanism 5 are provided.

The variable pulley mechanism 5 has a belt 11 suspended between a drive pulley 8 connected to the crankshaft 4 of the engine body 1 and a driven pulley 10 connected to the drive shaft 9 of the supercharger 6. The pulleys 8 and 10 change their groove spacing due to changes in centrifugal force as the number of rotations changes.

That is, as schematically shown in FIG. 2, the drive pulley 8 is a fixed position member 12 fixed to the crankshaft 4 of the engine.
and a moving member 13 movable relative to the fixed position member 12.
and has. Thus, the moving member 13 includes a cylindrical extension part 13a extending axially outward from the outer circumferential edge, and the extension part 13a extending axially outward from the outer peripheral edge.
It has an inclined flange portion 13b extending radially inwardly and axially outwardly from the outer end edge of 3a. Also,
A disc member 14 is fixed to the crankshaft 4 axially inwardly from the inclined flange portion 13b, and the disc member 14
A spring 15 is interposed between the moving member 13 and the moving member 13, and a rotating ball 16 is interposed between the disc member 14 and the inclined flange portion 13b.

As a result, as the centrifugal force acting on the ball 16 increases due to rotation of the pulley, the ball 16 is displaced radially outward, compressing the spring 15 and increasing the width of the pulley groove.

On the other hand, the driven pulley IO includes a fixed position member 17 fixed to the drive shaft 9 of the supercharger 6, and a movable member 18 located on the supercharger 6 side of the fixed position member 17. The moving member 18 has an extension part 18b extending radially outward from the central boss part of the main body 18a, and an extension part 18b extending radially outward from the outer edge of the extension part 18b so as to protrude toward the supercharger 6 side. It has an inclined flange portion 18c. A disk member 19 is fixed to the drive shaft 9 on the side closer to the supercharger 6 than the inclined flange portion 18c, and the disk member 19 has a spring 20 between the extended portion 18b and the inclined flange portion 18c. A ball 21 is interposed between them.

As shown in FIG. 3, the supercharger 6 is an internal compression type in which suction, compression, and discharge of intake air are performed continuously by the rotation of a male rotor 31 and a female rotor 32, and has a plate-type valve means 33. However, the amount of intake air is adjustable, and when the engine is under partial load, the amount of intake air is throttled to reduce the internal compression work of the supercharger 6.

The plate-type valve means 33 includes a plate-shaped valve member 41 (fourth
(see figure) is arranged on the suction side of the male rotor 31 and female rotor 32, and the cylinder means 42 is used to control the intake throttle position P.
1 and the open position P2. That is, the valve member 41 is connected to the tip of the piston rod 43 of the cylinder means 42, and the base end of the piston rod 43 is connected to the piston 45 in the cylinder body 44. The inside of the cylinder body 44 is caused by the piston 45.
It is divided into a chamber 46 and a second chamber 47, and a hydraulic power source 49 is connected to the second chamber 47 via a control valve 48. Also, the first
A spring 50 is interposed within the chamber 46 and biases the valve member 41 via the piston rod 43 in the direction of the open position P2.

The control valve 48 is switched and controlled by a controller 52 that receives an output from a throttle opening sensor 51 in accordance with the throttle opening corresponding to the engine load.

Note that the intake air capacity can be adjusted by changing the area of the cutout portion 41a.

With the above configuration, the variable pulley mechanism 5 allows
The pulley ratio between the driving pulley 8 and the driven pulley 10 is controlled, and the supercharger 6 can be rotated at high speed in the low engine speed range, so that high supercharging can be performed from the low engine speed range.

Further, during partial load, the control valve 51 is controlled by the controller 52, pressure oil is supplied to the second chamber 47 of the cylinder means 42, and the piston rod 43 and piston 45 are
moves, the valve member 41 of the plate-type valve means 33 becomes the intake throttle position P□, and the amount of intake air sucked into the supercharger 6 is restricted, so the internal compression work of the supercharger 6 is reduced. Therefore, the drive loss of the supercharger 6 is reduced, which is advantageous in terms of fuel efficiency.

In the above embodiment, the internal compression work is reduced by restricting the amount of intake air, but in addition, as shown in FIG. 5, a relief hole 62 is provided in the casing 61, and the relief hole 62 is 63, and during partial load, the valve body 63 may be moved to open the relief hole 62, part of the intake air may be relieved on the discharge side, and the internal compression work of the supercharger 60 may be reduced. . In this case, the valve body 63 is controlled to open and close by the cylinder means 64. In other words, the cylinder means 64 is linked to a hydraulic power source 66 via a control valve 65, and the control valve 65 is switched and controlled by a controller 71 that receives an output from a throttle opening sensor 70. The cylinder means 64 is driven and controlled according to the throttle opening degree. In addition, 67 is a discharge hole, 68.6
9 are male rota and female rota, respectively.

Therefore, during partial load, the control valve 65 is controlled by the controller 71, and pressure oil is supplied to the cylinder means 64 to move the valve body 13.
is opened, some of the intake air is relieved, and the internal compression work of the supercharger is reduced.

In the above embodiment, the variable pulley mechanism 5 uses a centrifugal type, but it may of course be an electromagnetic type or a combination of both.

(Effects of the Invention) As described above, the present invention combines an internal compression type supercharger and a variable pulley mechanism, so high supercharging can be performed from a low engine speed range. Since this is provided, it is possible to reduce drive loss of the supercharger during partial load and improve fuel efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is an overall configuration diagram of an engine with a mechanical supercharger, Fig. 2 is a schematic explanatory diagram of a variable pulley mechanism, and Fig. 3 is a work compression diagram of a supercharger. FIG. 4 is an explanatory diagram of the plate type valve means, and FIG. 5 is an explanatory diagram of a modification of the work compression means of the supercharger. ■...Engine body, 5...Variable pulley mechanism, 6...Supercharger, 8...Drive pulley, 10...Driver Pulley, 33...
Plate valve means, 52.71...controller, 62...relief hole, 63...valve body.

Claims (1)

[Claims] (1) In a device equipped with an internal compression type mechanical supercharger, the supercharger is driven via a variable pulley mechanism, while the internal compression work reduces the internal compression work of the supercharger during partial load. An engine with a mechanical supercharger, characterized by having a reduction means.