JPS6044499B2 - Engine power take-off device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power extraction device for an engine.

For example, in a bus cooling system that uses an auxiliary engine as a power source, the auxiliary engine 2 and the power extraction device 3 are integrally connected and mounted and fixed on the frame 1 via anti-vibration rubber 8, as shown in Figures 1 and 2. The frame 1 is installed under the floor of the bus, and the output shaft flange 4 of the power take-off device 3 is assembled.
It has a configuration in which a power transmission shaft for driven equipment, that is, various cooling equipment, is coupled to the cooling equipment.

In FIGS. 1 and 2, 5 indicates an exhaust pipe, 6 indicates a muffler, and 7 indicates a tail pipe. In such a bus cooling system, the driven equipment is subjected to a shocking load due to excessive torque fluctuations caused by engine explosion, especially when the engine is started or at low speeds, which can shorten the life of the driven equipment. Not only that, but in severe cases, the driven equipment may be damaged.

In order to solve the above problems, we developed a clutch plate with a buffer spring that slips between the output shaft of the engine and the driven shaft of the driven equipment during overload, and a clutch plate with a buffer spring that is fixed in the center of the clutch plate in the rotation direction. A shaft to be fitted, a damper to be fitted to the shaft so as to be fixed in the rotational direction, and power to be connected via a pulley, etc. that is coupled to the damper and has a V-belt groove on the outer periphery of which a V-heald for extracting power is hung. The present applicant has developed a take-out device and has already filed a patent application as 1932 Patent Application No. 74577 (see Japanese Patent Publication No. 59-24007).

The present invention further improves the above-mentioned patent application, significantly simplifies the structure, and provides a power take-off device that can accurately absorb and smooth large torque fluctuations.
The embodiment shown in FIG. 3 will be described below.

In FIG. 3, reference numeral 9 denotes a flywheel provided on the output shaft 10 of the engine 2. Mounting bolts 12 are attached to the end face of the flywheel 9, and a pressing plate 11 and a fixing plate 1
5 is fitted onto the mounting bolt 12 so as to be slidable in the axial direction.

A plurality of spring holders 13 are attached to the fixed plate 15 on the circumference, and each spring holder 13 supports a coil spring 14.
The structure is such that the pressing plate 11 is pressed against the flywheel 9 side by a spring force of 4, and the reaction force of the pressing is supported by a nut 12'' that is screwed onto the mounting bolt 12 and regulates the position of the fixed plate 15. By turning the nut 12'', the gap a between the fixed plate 15 and the pressing plate 11 can be changed, and the pressing force exerted by the coil spring 14 can be changed. A flange portion 16'' of a case 16 is fixedly connected to a flywheel housing flange portion 2'' of the engine 2, and a shaft 1 is attached to the case 16 by two bearings 19.
7 is rotatably supported.

A spline portion 17'' is formed at the base end of the shaft 17, a clutch plate 24 is fitted into the spline portion 17'', and a coil spring 24'' is mounted on the clutch plate 24 as shown in FIG. The clutch disc 2C is elastically coupled through the clutch disc 24'', and the clutch disc 24'' is held between the flywheel 9 and the pressing plate 11 with a constant pressure (pressing force due to the spring force of the coil spring 14). ing. A flange 4 is secured to the tip of the shaft 17 by a key 20 and fixed with a washer 21 and a bolt 22, and a flywheel 2 is attached to the middle of the shaft 17.
3 is fixed with a key 18.

A suitable number of window holes 16a are formed in the end surface of the case 16,
A suitable number of window holes 23a are also formed in the flywheel 23 facing inside the end surface of the case 16, and a tool is inserted through the window holes 16a and 23a from the outside of the case 16 to tighten the nut 12''. Turn the coil spring 14
The pressure spring force can be adjusted.

The power extraction device of the present invention having the above-mentioned configuration is designed to reduce the friction between the clutch disc 24'' and the engine-side flywheel 9 and press plate 11 that clamp it during normal operation without large torque fluctuations of the engine 2. Therefore, power is accurately transmitted to the shaft 17, and the flange 4 of the shaft 17
drive a driven device connected directly or indirectly to the

When a large torque change occurs due to engine explosion, such as when starting the engine or at low engine speed, this impact torque load is applied to the clutch disc 24'', the engine side flywheel 9 that clamps it, and the press plate 11. Overcoming the frictional force between the clutch disk 24'', the clutch disk 24'' slips, and as the torque fluctuation decreases, the clutch disk 24''
Since it operates to fix the torque, it is possible to completely prevent excessive torque or shocking torque fluctuations from being applied to the driven equipment.

In experiments, it was confirmed that when an explosion torque of about 1 scale of the normal operating torque is generated, it can be reduced by 2.5 to 3 times by using the device of the present invention.

This not only makes it possible to prevent damage to the driven equipment and extend its life, but also to make the transmission shaft to the driven equipment lighter and smaller.Furthermore, it can be used as a safety device to prevent damage during overload. It can also fulfill the following functions. Relatively small engine torque fluctuations during normal operation are caused by the flywheel 9 and clutch plate 24 on the engine side.
In addition to the buffering effect provided by the coil spring 24'' provided in the engine, the resonant frequency obtained by the rotating mass of the flywheel 23 on the shaft 17 side is configured to be at least 111.5 below the explosion frequency of the engine during steady rotation. Thereby, the torque fluctuation of the shaft 17 can be made sufficiently small.

When the torque fluctuation of the shaft 17 becomes smaller in this way,
For example, when a shaft having a spline is coupled to the flange 4, the noise generated by the backflash of the spline fitting portion can be significantly reduced.

Furthermore, by providing the flywheel 23 on the shaft 17, the mass of all the rotating parts of the driven equipment is increased by the rotating mass of the flywheel 23, and no special consideration is required for the mass of the rotating parts of the driven equipment. Also, all equipment can be driven smoothly.

At the time of maintenance, the shaft 17, flywheel 23, etc. incorporated in the case 16 can be removed by an extremely simple operation of simply disconnecting and pulling out the connection between the flywheel housing flange portion 2'' and the flange portion 16'' of the case 16. It can be removed in one piece, making inspection and parts replacement easy, and it is also extremely easy to assemble.The pressing force of the pressing plate 11 can be adjusted using the window holes 16a and 2.
3a, it can be carried out freely from the outside, and together with the fact that the number of parts is small and the cost is low, it can bring about great practical effects.

[Brief explanation of the drawing]

1 and 2 are a plan view and a front view showing an example of a power unit to which the present invention is applied, FIG. 3 is a sectional view showing an embodiment of the present invention, and FIG. 4 is a clutch plate portion of FIG. 3. FIG. 2...Engine, 3...Power take-off device, 4...Flange, 9...Engine side flywheel, 11...Press plate, 12・・・・・・
・Mounting bolt, 12" nut, 14...Coil spring, 15...Fixing plate, 16...
Case, 17...Wheel, 23...Flywheel, 16a, 23a...Window hole, 24...
・・Clutch plate, 24″ clutch disc, 4■・・・・
coil spring.

Claims (1)

[Claims] 1 A clutch plate with a buffer spring that is pressed and clamped by a spring to a flywheel on the engine side and a pressing plate supported by the flywheel is rotatably supported via a bearing in a case that is connected and fixed to the flywheel housing of the engine. The proximal ends of the power take-off shafts are connected by spline fitting, and the distal end of the power take-off shafts is provided with means for connecting with a driven device, and a flywheel is attached to the power take-off shafts. Characteristic engine power extraction device.