JPS589258B2 - Engine auxiliary drive system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for driving auxiliary equipment such as an engine water pump, cooling fan, generator and power steering pump, and car cooler compressor.

Conventional engine auxiliary equipment drive devices usually have a drive pulley directly connected to the end of the engine crankshaft, and this pulley drives temporary pulleys of various auxiliary equipment via a V-belt, a fixed belt, etc.

Therefore, in this case, if the pulley ratio of both pulleys is set so that the auxiliary equipment operates sufficiently even when the engine is rotating at low speed, the auxiliary equipment will overspeed when the engine is rotating at high speed because this pulley ratio is constant. There were drawbacks.

Devices for eliminating such drawbacks have already been proposed, but none of them are sufficiently practical.

What is shown in Figures 1 to 3 (Japanese Unexamined Patent Publication No. 53-121329
No.) is an example of this, in which a planetary gear set, a brake device, and a one-way clutch C are installed between an input shaft a fixed to the engine crankshaft and a pulley B, which is an output member, and a sun gear d and a one-way clutch C are installed. Connect drum e, carrier f and input shaft a, ring gear g and pulley b.
is connected, a one-way clutch C is provided between the input shaft a and the pulley b, and when the engine speed detection device h detects a state where the engine speed is below a predetermined speed, the contact of the relay switch l is in the OFF state. (shown by the solid line in Figure 1), and the solenoid valve m tightens the brake band j by introducing negative pressure from a negative pressure source such as the engine intake pipe into the negative pressure drive device i, thereby tightening the brake drum e. By fixing , and also fixing the sun gear d, the accelerated rotation from the input shaft a is taken out from the pulley b, and when the rotation speed is higher than the predetermined number, the contact of the relay switch l is turned on (as shown in Fig. 1). (dotted-dash line position), the solenoid valve m enters the atmospheric pressure introduction state and releases the brake drum e and sun gear d, and the one-way clutch C is activated to input shaft a.
The rotation of the pulley b is transmitted directly to the pulley b.

That is, according to the above-mentioned apparatus, the rotational speed of the auxiliary machine is represented by the broken line A in FIG.

The chain line B is a line representing the rotational speed of the auxiliary machine relative to the engine rotational speed of a device in which the pulley is directly connected to the crankshaft.

The conventional devices shown in FIGS. 1 and 2 described above have the following drawbacks.

(1) A brake drum e is provided in front of the pulley b, and a detection device h, a width increaser k, a relay switch l, a solenoid valve m, a vacuum drive device i, etc. for operating the brake band j must be provided externally. This makes the device complicated and requires a large amount of installation space.

(2) Since the planetary gear system operates at low engine speeds when the engine noise is relatively low, the gear noise is easy to hear.

The present invention was made to eliminate the drawbacks of the conventional devices described above, and all necessary mechanisms such as a planetary gear mechanism, a clutch mechanism that detects the engine speed and connects/disconnects, and a one-way clutch are compactly housed inside the pulley. In addition to reducing the need for extra equipment space by housing the device in a smaller device, a clutch is used to connect the sun gear and ring gear of the planetary gear set to prevent the meshing rotation of the gears during low engine speeds, which are frequently used. By stopping the engine, the purpose is to prevent gear noise from occurring at low engine speeds when the engine noise is relatively low.

Furthermore, when the engine is running at high speeds, the deceleration effect of the planetary gears can reduce noise from pulleys, belts, and operating noise of various auxiliary equipment such as fan noise compared to conventional models. Because of its large size, the noise caused by the auxiliary drive device becomes almost unnoticeable.

Embodiments of the present invention will be described below with reference to FIGS. 4 to 6.

FIG. 4 schematically shows the device of the present invention, and FIG.
The figure shows a practical design example.

In the figure, 1 is the engine crankshaft, 2 is a fixed wall that is part of the engine, 3 is an accessory drive pulley, 4 is a driven pulley,
5 is a cooling fan.

In the present invention, an input shaft 6 is fixed to the tip of the crankshaft 1 via a key 7 and a bolt 8, and the input shaft 6, a fitting sleeve 9, and a conical clutch drum 1 are connected to the input shaft 6.
A member integrally formed with a ring gear 11 of a planetary gear set is rotatably fitted to the input shaft 6 via a bush 9a, and between the outer circumferential surface of the sleeve 9 and the fixed wall 2 there is a connection between the engine rotation and the ring gear 11 of the planetary gear set. A one-way clutch 12 is provided to prevent rotation of the sleeve 9 in the opposite direction.

Further, a sleeve 13 is fitted to the intermediate portion of the input shaft 6 using a key 14, and a clutch sliding member 15 that can be brought into close contact with the inner circumferential surface of the clutch drum 10 is fitted into the sleeve 13 with its protrusion 13a and notch 15a. They are provided so that they can rotate together and slide freely in the axial direction.

The clutch sliding member 15 and the sleeve 13 are connected to each other by connecting the clutch member onto the sleeve via an elastic plate, as in a well-known clutch device, and by the bending of the elastic plate, the clutch member is moved in the axial direction. It is possible to adopt a structure in which rotational force is transmitted through an elastic plate.

Furthermore, a bracket 16 is provided protruding from this sleeve 13,
One end of the governor weight 17 is pivotally supported on the bracket 16 via a pin 18, and a spring 19 is provided for pulling the free end of the governor weight 17 toward the input shaft 6 to constitute a governor device.

When the engine rotation is below a predetermined value (for example, 1500 rpm), the spring 19 pulls the governor weight 17 toward the input shaft 6 side, and the protrusion 17a of the governor weight 1γ pushes the clutch sliding member 15 to the right in the figure, causing the clutch 10.15
is connected, and when the engine rotation is above a predetermined value, the centrifugal force of the governor weight 17 overcomes the force of the spring 19, causing the governor weight 17 to rotate in a direction that stretches the spring 19, thereby causing the clutch 10. 15.

Further, a sun gear 20 is formed on the outer periphery of the input shaft 6 at a position facing the ring gear 11, and a planetary gear 21 meshing with the sun gear 20 and the ring gear 11, respectively, is rotatably provided on the carrier 23 via a shaft 22. career 2
3 is fixed to the pulley 3 with screws 24.

In the figure, 25 is a stop pin for fixing the shaft 22 to the carrier 23;
6 is a bearing inserted between the input shaft 6 and the carrier 23, 27 is an oil seal provided on the outside thereof, 28 is a seal ring that seals the joint between the carrier 23 and the pulley 3, and 29 is fixed to the pulley 3. The bearing 30 inserted between the wall 2 and the wall 2 is an oil seal.

Next, the operation of the apparatus of the present invention constructed as described above will be explained.

When the engine is started and the crankshaft 1 rotates, the sanghya 20, sleeve 13, and governor weight 1 are rotated.
7, and the clutch sliding member 15 rotate.

Therefore, the engine speed is set to a predetermined value, for example, 1500 rpm.
In the following cases, the centrifugal force of the governor weight 17 is weaker than the spring 19, so the governor weight 17 is pulled by the spring 19 using the pin 18 as a fulcrum, and as a result, the protrusion 17a of the governor weight 17 moves the clutch slider 15 to the right push towards

Therefore, the clutch slider 15 and the clutch drum 10 are tightly fitted and rotate together.

Further, since the ring gear 11 and the clutch drum 10 are integrated, the ring gear 11 also rotates together with the sun gear 20.

Therefore, the pulley 3 also rotates together with the crankshaft 1 via the planetary gear 21, shaft 22, and carrier 23.

That is, during this low speed rotation, the rotation ratio between the pulley 3, which is an output member, and the input shaft 6 is 1:1.

Next, when the engine speed reaches a predetermined value, for example 1,500 or more, the centrifugal force generated in the governor weight 17 is 1
9, the governor weight 17 rotates about the pin 18 in a direction that extends the spring 19,
As a result, the protrusion 17a is retracted and the clutch slider 15
Since the clutches 10 and 15 are no longer pressed, the clutches 10 and 15 are disconnected.

Therefore, the ring gear 11 integrated with the clutch drum 10
is also free, but sleeve 9 integrated with ring gear 11
Since a one-way clutch 12 is interposed between the engine and the fixed wall 2, the ring gear 11 is fixed without rotating in the opposite direction with respect to the engine rotation direction.

On the other hand, as the sun gear 20 rotates, the planetary gear 21 meshing therewith rotates, and due to the meshing of the planetary gear 21 and the ring gear 11, it is decelerated and revolves in the same direction as the engine rotation.

This revolution of the planetary gear 21 is transmitted to the pulley 3 via the shaft 22 and carrier 23.

That is, when the engine rotates at high speed, the pulley 3, which is an output member, rotates at a reduced speed with respect to the engine rotation.

That is, the rotation of the auxiliary drive pulley 3 by the device of the present invention is as shown by broken line C in FIG.

The chain line B shows the case of a conventional device in which the pulley is directly connected to the crankshaft.

As described above, according to the present invention, since the auxiliary equipment is driven at a reduced speed when the engine is running at high speed, the rotation of the auxiliary equipment when the engine is at low speed can be made higher than in the conventional case.

In other words, the pulley ratio between the drive pulley provided on the crankshaft and the driven pulley of the auxiliary equipment can be set to be faster than the conventional one, and the capacity of the auxiliary equipment can be reduced by the increased speed, thereby reducing weight. .

Since the rotation of the auxiliary equipment can be decelerated in the high speed range of the engine, the driving horsepower of the auxiliary equipment can be reduced compared to conventional systems.

Furthermore, as mentioned above, the device of the present invention compactly accommodates all the necessary mechanisms such as the planetary gear mechanism, the clutch mechanism that detects the engine speed and connects/disconnects, and the one-way clutch inside the pulley. It is possible to reduce the size and weight, facilitate manufacturing, and eliminate the need for extra device space.

In addition, all of the devices of the present invention are housed inside a pulley for driving auxiliary equipment, and the inside of this pulley communicates with the inside of the engine body and is completely isolated from the outside by an oil seal, so engine oil is used for lubrication. In addition to being able to share the same space, there is no risk of water or dust entering from the outside.

Therefore, the reliability of the device is improved and maintenance is easy.

Furthermore, according to the device of the present invention, when the engine is frequently used at low speeds, the clutch connects the sun gear and the ring gear of the planetary gear set to stop the meshing rotation of the gears, which is advantageous in terms of durability and makes the engine relatively quiet. This has the effect of reducing noise by eliminating gear noise at low rotation speeds.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a conventional device, FIG. 2 is a side view showing a part of the device in cross section, FIG. 3 is an output characteristic diagram thereof, FIG. 4 is a schematic diagram of the device of the present invention, and FIG. The figure is a sectional view showing an embodiment of the device of the present invention, and FIG. 6 is its output characteristic diagram. 1...Crankshaft, 2...Fixed wall, 3
...Auxiliary drive pulley, 6...Input shaft, 9...Sleeve, 10...Clutch drum, 11...Mountain/ring gear, 12... ...One-way clutch, 13...Sleeve, 15.
...Clutch sliding member, 16...Bracket, 17...Governor weight, 17a...
...Protrusion, 18...Pin, 19...
Spring, 20...Sanghya, 21...Planetary gear, 22...Shaft, 23...Carrier.

Claims (1)

[Scope of Claims] 1. A sun gear of a planetary gear set is provided on the human power shaft, a clutch is provided between the sun gear and the ring gear that connects at a predetermined engine speed or less, the output member and the carrier are integrally connected, and the ring gear and the ring gear are connected together. A one-way clutch is provided between the fixed member and the engine to prevent rotation in the opposite direction to the engine rotation.
When the engine speed is below a predetermined value, the input shaft and the output member are directly connected by connecting the sun gear and the ring gear using the clutch, and when the engine speed is above a predetermined value, the ring gear is connected via the one-way clutch. An engine auxiliary drive device characterized in that an output member is driven at a reduced speed by being fixed. 2. The engine accessory drive device according to claim 1, wherein the clutch is driven by a governor device installed on an input shaft.