JPS6045726A - Transmission device for driving auxiliary machinery - Google Patents

Abstract

PURPOSE:To prevent an operation noise at a low cost, by providing a transmission system with a mechanism for transmitting motive power only to a rotary member, which rotates together with an output shaft for driving auxiliary machinery, from another rotary member, which rotates together with an input shaft driven by an engine. CONSTITUTION:When an engine is started, a clutch plate 20 is attracted by an electromagnetic coil 16 for frictional connection so that an input shaft 1 connected to a plate 20 is coupled to an output pulley 2. A direct drive transmission system is thus constituted between an input and an output sides so that a pulley 10 is rotated more rapidly than another pulley 9, and toothed belts 11, 12 race without being restrained by the pulley 9, because of the action of a one-way clutch. When the engine has reached a high revolution speed, the coil 16 is de- energized so that the clutch plate 20 is released from the frictional connection, by a plate spring 19. As a result, the rotation of the input shaft 1 is transmitted to the pulley 9 and then to the pulley 10 through the one-way clutch, and thereafter retarded and transmitted to the pulley 7, so that the output pulley 2 is rotated. A speed-reduction transmission system is thus constituted to suppress noise and vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission for driving auxiliary equipment of an internal combustion engine for an automobile.

Generally, auxiliary equipment of an automobile, such as an alternator and a cooling compressor, is driven to rotate in proportion to the engine speed via a pulley fixed to the end of the engine's crankshaft and a belt wrapped around the pulley.

Therefore, there is a problem in that the auxiliary machinery is driven at a higher rotational speed than necessary, particularly in the high-speed rotational range of the engine, resulting in wasted power consumption.

Therefore, a transmission using a two-stage belt type transmission mechanism or a transmission using a planetary gear system between the input side and the output side is installed, and an electromagnetic clutch is used to adjust the electromagnetic transmission according to the engine rotation speed. Either the clutch is engaged and the above-mentioned transmission is inactive, and the input side and the output side are directly connected for transmission, or the electromagnetic clutch is disengaged and the transmission is operated to switch to a variable speed transmission system and decelerate. A transmission system for driving auxiliary equipment is adopted.

Such a transmission device can keep the auxiliary machinery within a generally appropriate rotational range, but the two-stage belt system and planetary gear device are expensive, and the planetary gear device has problems such as generating noise during operation. .

The present invention has been made in view of the above-mentioned points, and provides a transmission device for driving an accessory that switches between an input shaft driven by an engine and an output shaft that drives an accessory to a direct coupling transmission system or a variable speed transmission system using an electromagnetic clutch. , a first rotating body that rotates integrally with the input shaft, a second rotating body that rotates integrally with the output shaft and has a radius different from that of the first rotating body, and the first rotating body. By configuring the speed change transmission system with a power transmission mechanism that is interposed between the second rotating body and transmits power only from the first rotating body to the second rotating body, it is inexpensive and generates no noise during operation. It is an object of the present invention to provide a transmission for driving an auxiliary machine that does not cause this problem.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show an example of an electromagnetic clutch type auxiliary drive transmission according to the present invention, in which an input shaft 1 fixed to the end of a crankshaft of an engine (not shown) and an output pulley 2 are connected. A transmission mechanism 3 is disposed between them.

The transmission mechanism 3 includes a pulley 4 formed by carving a circumferentially-shaped annular toothed groove 1a at a predetermined location on the outer circumferential surface of one end of the input shaft 1, and a pulley 4 that rotates on the input shaft 1 via a ball bearing 5. A pulley 7 is formed by carving an annular toothed groove 6a along the circumferential direction at a predetermined location on the outer circumferential surface of one end of the hollow output shaft 6, which is freely externally supported by the shaft, and the lower part of the input shaft 1 in the figure. The input shaft 1 includes an auxiliary shaft 8 disposed parallel to the input shaft 1, and pulleys 9 and 10 rotatably supported by the auxiliary shaft 8.

Pulleys 9 and 10 are integrated with a one-way clutch (not shown) interposed between them, and the rotation of pulley 9 is transmitted to pulley 10, but the rotation from pulley 10 to pulley 9 is not transmitted. has been done. The outer peripheral surface of each pulley 9, 10 has a toothed groove 1a of the pulley 4, 7, respectively.
, 6a, and toothed belts 1.1.12 are wound between the pulleys 4 and 9 and between the pulleys 7 and 10, respectively. has been done. In addition, pulley 9. The radius of IO is equal and pulley 7
The radius of is set larger than the radius of pulley 4,
Pulleys 4 and 7 have different rotation ratios, that is, the rotation speed of output pulley 7 is lower than the rotation speed of input pulley 4. The output pulley 2 is externally fitted and fixed to the other end 6b of the output shaft 6. Each of these pulleys 9, 10
The one-way clutch constitutes a power transmission mechanism, and this power transmission mechanism, pulleys 4 and 7, and belts 11 and 12 connecting these constitute a speed change transmission system. The pulley 2 and a pulley of an auxiliary machine (not shown) are connected by a belt 21.

On the other hand, an annular bracket 15 is fixed to the open end of a substantially bowl-shaped housing 14 supported on the input shaft 1 via a ball bearing 13, and an annular electromagnetic coil 16 is attached to the bracket 15. . and bracket 1
5 is fastened and fixed to the housing 14 by bolts 17. Further, an annular bracket 18 is attached to the other end of the input shaft I.
is fixed to the bracket 18, and an annular clutch plate 20 is supported on the bracket 18 via a leaf plate 19. One end surface of the clutch plate 20 is disposed opposite to the opposing end 6d of the substantially bowl-shaped end 6C of the output shaft 6 with a slight gap, thereby forming a frictional coupling portion of the clutch. Electromagnetic coil 16
is connected to an external control unit (not shown), and this control unit controls energization to the electromagnetic coil 16 based on a signal representing the operating state of the engine input from, for example, an engine rotation speed sensor.

Next, the operation of the auxiliary equipment drive transmission device having such a configuration will be explained with reference to FIGS. 1 to 3.

When the engine (not shown) starts and the crankshaft rotates, the electromagnetic coil 16 is energized from the external control unit (not shown), and the clutch plate 20 is moved by the leaf spring 19.
The output shaft 6 is attracted by the electromagnetic coil 16 against the spring force of
is crimped and frictionally coupled to the end surface 6d. For this reason, the clutch plate 20 is provided with a leaf spring 19. The input shaft 1, which is coupled via the bracket 18, and the output pulley 2, which is directly coupled to the outer circumferential portion 6b of the output shaft 6, are coupled integrally, and as a result, 1 on the input side and the output side: A direct transmission system of J is constructed. At this time, since the rotation radius of pulley 7 is larger than the rotation radius of pulley 4, pulley 10 is
As a result, the rotation of the pulley 10 is not restrained by the pulley 9 by the one-way clutch, and the toothed belt idles.

The engine speed increases and reaches a high speed range, for example,
In the figure, when the engine speed exceeds N1, the energization to the electromagnetic coil 16 is stopped, the electromagnetic coil 16 loses its magnetic force, and the clutch plate 20, which had been attracted, is moved by the spring force of the leaf spring 19 to the original state shown in FIG. Return to the position of output shaft 6
is separated from the end face 6d, and the frictional connection is released. Therefore,
The rotation of the input shaft 1, that is, the rotation of the pulley 4 is transmitted to the pulley 9 by the toothed belt 11, and the rotation of the pulley 9 is transmitted to the pulley 10 via the one-way clutch.

The rotation of the pulley 10 is then transmitted to the boot IJ 7 at a reduced speed by the toothed belt 12. As mentioned above, the pulley 7 is directly connected to the output pulley 2, so the output pulley 2 rotates together with the pulley 7, and as a result, the input shaft 1° pulley 4, pulleys 9, 10, and pulley 7 A speed change (deceleration) transmission system is configured. in this case,
As shown in FIG. 2, by setting the radius ratios of pulley 4 and pulley 9 and pulley 10 and pulley 7 to appropriate values, a desired reduction ratio can be obtained.

Therefore, the operating state of one engine is at startup or in the low speed rotation range (<N
, ), the rotation speed of the output side pulley 2 is made the same as the rotation speed of the engine concerned, and when the rotation speed is in the high speed range (≧N+), the rotation speed of the output side pulley 2 can be reduced below the engine rotation speed. Accordingly, the rotational speed of the auxiliary equipment can be adjusted to an optimal value.

In this embodiment, the transmission mechanism has been described as consisting of a toothed belt and a pulley, but the present invention is not limited to this, and it may be constituted of, for example, a normal V-belt or a chain and sprocket.

As explained above, in the present invention, in an accessory drive transmission system that switches between an input shaft driven by an engine and an output shaft that drives an accessory to a direct coupling transmission system or a variable speed transmission system using an electromagnetic clutch, A first shaft that rotates together with the input shaft.
a second rotating body that rotates together with the output shaft and has a radius different from that of the first rotating body;
Since the speed change transmission system is constituted by a power transmission mechanism that is interposed between the rotary body and the second rotary body and transmits power only from the first rotary body to the second rotary body, the speed change transmission system of the engine is It has the advantage of being able to change gears appropriately depending on the operating condition, being inexpensive, and effectively suppressing the generation of noise and vibration.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an example of an accessory drive transmission according to the present invention, FIG. 2 is a cross-sectional view taken along line nn of FIG. 1, and FIG. 3 is an accessory drive transmission according to the present invention. FIG. 3 is a diagram showing an example of the speed change characteristics of the device. ■...Input shaft, la...Toothed groove, 2...Output side pulley, 3...Transmission mechanism, 4...First pulley, 6...
...Hollow output shaft, 6a...Toothed groove, 7...Second pulley, 8...Auxiliary shaft, 9.10...Pulley, 9a
, 10a...Toothed groove, 11.12...Toothed belt, 16...Electromagnetic coil. Applicant: Diesel Kiki Co., Ltd. Agent: Patent Attorney: Toshihiko Watanabe Figure 1 Figure 2 - 7 engine rotation 134

Claims (1)

[Claims] 1. In an auxiliary equipment drive transmission that switches between an input shaft driven by an engine and an output shaft that drives an auxiliary equipment to a direct coupling transmission system or a variable speed transmission system using an electromagnetic clutch, the transmission system rotates integrally with the input shaft. a first rotating body; a second rotating body that rotates together with the output shaft and has a radius different from that of the first rotating body;
and a power transmission mechanism that is interposed between the J-th rotating body and the second rotating body and transmits power only from the first rotating body to the second rotating body. A transmission for driving auxiliary equipment, characterized by comprising: