JPS63302142A - Belt tensioner provided with speed change gear train - Google Patents

Abstract

PURPOSE:To make it possible to facilitate the adjustment of tension with a simple arrangement, by disposing a speed change gear train between the shaft of a pulley and the drive shaft of an engine accessory, and by rotating a rotary arm section including a speed change gear housing, by means of a tension regulating means provided in an attaching arm integrally incorporated with the engine accessory. CONSTITUTION:A speed change gear train is disposed between the shaft of a generator 7 as an engine accessory secured to an engine body by means of bolts, and the shaft 11 of a pulley associated with a crankshaft through a belt 16. This speed change gear train is composed of different diameter gears which are fixed respectively to the pulley shaft 11 and the generator shaft and are meshed with each other, and a rotary arm section 10 forming a gear housing in which both gears are disposed. An attaching arm 13 is provided to the body of the generator 7, having one end part formed therein with a hole through which a tension regulating bolt 14 is inserted. This bolt 14 is threadedly engaged with a cylindrical pin 15 provided at the end of the rotary arm section 10 and formed therein with a threaded hole. Further, the bolt 14 is rotated so as to rotate the rotary arm section 10 to adjust the tension of the belt 16.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a belt tensioner with a transmission, particularly a transmission system that takes into consideration belt tension adjustment when driving a generator for an automobile with a belt. Regarding mechanical belt tensioners.

(Prior art) Automobile generators are normally attached to the engine body with bolts, and the rotational force from the crankshaft is transmitted to the generator pulley via a belt, causing the rotation of the It is configured to drive a generator, which is an auxiliary machine, through the

FIG. 6 is a conceptual diagram seen from the front of the engine for explaining the conventional system, in which 1 is a crank pulley, which is connected to the crankshaft 17 and the shaft 2.

3 is a water pulley, 4 is an input pulley for a generator, and a belt 5 is wound between these pulleys.

That is, the rotational force of the crankshaft 2 rotates a water pump and a generator (not shown) via the belt 5.

(Problems that the invention seeks to solve) In the conventional device having the above configuration, when adjusting the tension, first loosen the multiple bolts fixed to the engine body, and then set the generator to a freely rotatable state. In this state, the generator is rotated using, for example, a crowbar, and at the same time, a predetermined tension is applied to the belt hanging on the boob.
It was secured by loosening the bolts.

Moreover, the part where a predetermined tension is applied and tightened is usually done using a bracket attached to the engine body.
The installation strength is weak.

Therefore, when the generator is driven via a belt, the power generation th is pulled by the belt, which not only loosens the attachment of the generator itself but also causes the belt to loosen.

Furthermore, tension tone! ! ! In some cases, the generator itself has to be removed from the engine body, which is not only troublesome, but also requires the installation of tension adjustment means, which has the disadvantage of increasing the number of man-hours.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a belt tensioner with a transmission that allows easy tension adjustment and requires less man-hours for assembly.

[Structure of the Invention] (Means for Solving the Problems) In the present invention, a belt tensioner that adjusts the tension of a device that transmits driving force from an engine to an auxiliary machine using a bell 1 and a boob is equipped with J3. The shaft of the boob and the drive shaft of the auxiliary machine are meshed through a transmission, and the gear connected to the shaft of the boob is housed in a housing to form a rotating arm part, and the auxiliary machine... A tension adjusting means is provided on a mounting arm provided on the body structure to rotate the rotary arm portion.

(Function) Therefore, in order to increase the tension of the belt, if the tension adjustment means is loosened and the rotary arm portion is rotated, the pulley moves as a result, making it possible to adjust the tension.

Note that this tension adjustment is performed regardless of the fixation of the auxiliary equipment.

(Example) Examples will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of a belt tensioner with a transmission according to the present invention.

In FIG. 1, reference numeral 7 denotes a generator as an auxiliary machine, which is fixed to the engine body (not shown) through fixing holes Q and 8-1 with bolts or the like.

A guide 9 is provided at the center of the power generator 817, and the rotary arm portion 10 can rotate left and right around this guide.

Note that inside this guide 9 there is a shaft of a generator (not shown), to which the rotor is fixed. 11 is a shaft of a pulley 12, and the shaft of the generator (not shown) and the shaft 11 of the pulley 12 are connected by gear.

By the way, the means of gear connection is not the main point, so I'll leave it at that! In other words, a large gear is provided on the shaft 11 of the pulley 12, and a small gear is provided on the shaft of the generator, and the gears are meshed together to obtain an increased output. These transmissions are housed within the rotating arm section 10.

Also, due to the rotation of the rotating arm portion, the shaft 11
The meshing between the gear and the shaft of the generator (not shown) is maintained.

A mounting arm 13 is provided on the main body of the generator, and a tension vA adjustment bolt 14 is inserted into a straight hole at the end of the mounting arm 13, and the tension vA adjustment bolt 14 is inserted into a cylindrical bottle 15 with a threaded hole provided at the end of the rotating arm section 10. Screw together the adjustment bolt 14. 16 is a bell t.

Next, the effect will be explained.

The power generator 117 attached to the engine body through the fixing hole 8.8-1 is operated by the rotation of the pulley 12 by the belt 16.

That is, when the pulley 12 rotates, the shaft 11 integrated with this pulley rotates, and due to the meshing between the large gear provided on the shaft A7 and the small gear provided on the shaft of the generator, the shaft 11 (not shown) is rotated. Rotate the rotor.

When the tension of the belt 16 is loosened in this state, when the tension adjustment bolt 14 provided on the mounting arm 13 is rotated in the loosening direction, the threaded cylindrical pin 15 moves in the opposite direction.

This movement causes the rotating arm portion 10 to rotate clockwise around the guide 9, and as a result, the pulley 12
clockwise to increase the tension on the belt 16.

In addition, to weaken the tension, loosen the tension adjustment bolt 14 in the opposite manner to the above, and the rotating arm portion 10 will rotate counterclockwise (direction B) around the guide 9, thereby weakening the tension of the belt 16. becomes possible.

FIG. 2 is a block diagram of another embodiment.

In this embodiment, a threaded groove is provided in the mounting arm part 13-1, and the tension adjustment bolt 14-1 is screwed into the mounting arm part 13-1, and the tension is adjusted by pressing the end part 11 of the rotating arm part 10 by rotating the bolt. I made it.

Note that the other configurations and operations are the same as those in FIG. 1.

FIG. 3 is a block diagram of still another embodiment.

In this embodiment, the tension adjustment bolt 14-1 is placed on the lower side of the generator 7, and its threaded position is placed on the opposite side of the shaft 11 with the guide 9 in between at the rotating arm portion 10-1. .

In this embodiment, in order to rotate the shaft 11 about the guide 9, a force greater than that shown in FIGS. 1 and 2 is required.

FIG. 4 is a block diagram of another embodiment of the present invention.

In this embodiment, in the configuration shown in FIG. It is substantially the same as in FIG. 3 except for the drive means at -2.

FIG. 5 shows another modified example of the tension adjustment means, in which a piston 53 is provided together with a spring 52 in an oil chamber 51, and the entire (spring) + (damper) configuration is automated. This shows that the tension adjustment means may be applied.

[Effects of the Invention] As explained above, according to the present invention, the tension adjustment section is built into the auxiliary machine itself, and the boot can be operated independently of the means for attaching the auxiliary machine, so that the main body of the auxiliary machine can be fixed. Tension can be adjusted without changing.

Furthermore, since the tension adjustment section is incorporated into the auxiliary equipment itself, the number of man-hours required for assembling the engine can be reduced, which is effective in modularizing parts.

Furthermore, when an automatic tension adjustment section is used, the tension adjustment section can be made smaller.

4. Explanation of the Drawings Fig. 1 is a configuration diagram of one embodiment of a belt tensioner with a transmission according to the present invention, Fig. 2 is a configuration diagram of another embodiment, and Fig. 3 is a configuration diagram of yet another embodiment. 4 are configuration diagrams of still another embodiment, FIG. 5 is a diagram of another modification of the tension adjusting means, and FIG. 6 is a diagram illustrating a conventional device.

Claims (1)

[Claims] In a belt tensioner that adjusts the tension of a device that transmits driving force from an engine to an auxiliary device via a belt and a pulley, the shaft of the pulley and the drive shaft of the auxiliary device are meshed via a transmission, and the A gear connected to the shaft of the pulley is housed in a housing to form a rotating arm, and a tension adjusting means is provided on a mounting arm integrated with an auxiliary machine to rotate the rotating arm. Belt tensioner with transmission.