JPS6141464Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a belt whine noise prevention device, and more specifically, the invention relates to a belt whine noise prevention device, and more specifically, the belt is rotated by being stretched around a plurality of pulleys, including a pulley attached to a shaft with large rotational fluctuations, and with initial tension applied. This invention relates to a device for preventing belt whine noise.

For example, when an engine is driven by a toothed belt running from the crankshaft pulley to the camshaft pulley, oil pump pulley, etc., the rotational fluctuations may cause toothed belts near pulleys that have large rotational fluctuations, such as the camshaft pulley. The belt vibrates and a humming noise is generated from the toothed belt and from the pulley due to interference between the toothed belt and the pulley, giving an unpleasant feeling.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a belt whine noise prevention device that reduces or eliminates the whine noise.

According to the whirring noise prevention device of the present invention, the roller is placed near the pulley of the shaft with large rotational fluctuations,
pressed against the belt. This roller is supported by a rotating member which is rotatably supported relative to a fixed object by a bearing, while a spring is arranged between the rotating member and the fixed object. This spring applies a small pressing force to the roller compared to the initial tension set in the belt.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, from the engine crankshaft pulley 10 to the oil pump pulley 1,
2. Toothed belt 16 on camshaft pulley 14
In a belt transmission device in which the toothed belt 16 is stretched over the belt and the initial tension of the toothed belt 16 is set by the tension roller 18, the pulley 14 of the camshaft
The above-mentioned whining sound is generated in the vicinity of.

The belt beat noise prevention device 20 of the present invention is installed near a pulley, such as this pulley 14, that is attached to a shaft that undergoes rapid rotational fluctuations. In this case, it is preferable to install the toothed belt in a location where it vibrates most violently. As shown in FIGS. 2 and 3, this beat noise prevention device 20 is constructed so that a roller 22 is pressed against the toothed belt 16 by a spring 24.

In the illustrated example, the roller 22 is composed of an outer ring of a bearing, and a shaft 30 is press-fitted into an inner ring 28 located inwardly through a rolling element 26 such as a ball. It is press-fitted into a mounting seat 34 provided in the section. As a result, the roller 22 is rotatable around the axis 30.

A mounting seat 36 is provided at the other end of the plate-shaped rotating member 32, and an outer ring 40 of a bearing 38 is press-fitted into this mounting seat.

The bearing 38 has an inner ring 44 inwardly via rolling elements 42 such as balls. A spacer 46 is provided on one side of this inner ring 44;
A fixing plate 48 is applied to each of the inner rings 44, and a fixed object 52 such as an engine body is screwed onto a bolt 50 inserted from the other side of the inner ring 44, thereby fixing the inner ring 44. With the above configuration, the rotating member 3
2 is rotatable relative to the fixed object 52. In this case, the pivoting portion of the rotating member 32 is connected to the bearing 3.
8, the rotating member rotates smoothly.

The spring 24 is attached to the mounting seat 36 of the rotating member 32.
It is wound around the outside of the rotary member 32 at a distance from its outer peripheral surface, and one end thereof is hooked to a stopper 54 attached to the rotating member 32. In the illustrated example, the fixed plate 48 is interposed between the rotating member 32 and the fixed object 52, so the other end of the spring 24 is hooked to a stopper 56 attached to the fixed plate 48. . Since the rotating member 32 is rotated by the spring 24, the roller 22 receives the spring force of the spring 24, and the toothed belt 1
6, and the vibration of the toothed belt is suppressed by the spring. When configured with a fixing plate interposed as in the above example, the whine noise prevention device is manufactured as a finished product in which both ends of the spring are hooked, and can be used simply by attaching it to a fixed object 52 with bolts 50. This is preferable because it is possible.
However, the present invention can also be used without the fixing plate 48. In this case, the other end of the spring 24 is hooked directly to the fixed object 52. The term "the end of the spring is hooked to a fixed object" includes both of the above embodiments.

The spring 24 causes the roller 22 to
The spring force is set so that the pressing force applied to the toothed belt 16 to push the toothed belt 16 is smaller than the initial tension set to the toothed belt 16. Due to this weak spring force, the initial tension of the toothed belt is hardly influenced by the spring 24.

A stopper 58 projects from the fixed plate 48, and a rubber cushioning material 60 is attached to the stopper 58. On the other hand, a stopper 62 is provided on the rotary member 32 to face the buffer material 60, and when the toothed belt 16 swings outward, the stopper 62
hits the cushioning material 60, and prevents the toothed belt 16 from swinging outward any further.

Although the above example describes a toothed belt, the present invention can be applied to belts other than toothed belts.

According to the present invention, since the roller is pressed against the belt with a weak pressing force, it is possible to absorb fluctuations in belt tension due to fluctuations in the rotation of the pulleys and suppress vibrations. As a result, interference between the belt and the pulley can be alleviated and generation of whining noise can be prevented.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing a belt transmission device equipped with the whine noise prevention device of the present invention, FIG. 2 is a front view of the whine noise prevention device, and FIG.
It is a 3-line sectional view. 10, 12, 14... Pulley, 16... Toothed belt, 20... Beating sound prevention device, 22... Roller, 24... Spring, 30... Shaft, 32... Rotating member, 38... Bearing .

Claims (1)

[Scope of utility model registration request] A device for preventing whirring noise from a belt that is rotated by applying initial tension to a plurality of pulleys including a pulley attached to a shaft that projects from a solid object and has large rotational fluctuations, A roller pressed against the belt placed near a pulley with a large shaft, a shaft rotatably supporting the roller, an inner ring fixed to the fixed object, and a rolling element placed outside the inner ring. a bearing consisting of an outer ring mounted on the outside of the rolling element; a rotating member having a shaft supporting the roller at one end and fixed to the outer ring of the bearing at the other end; one end of the belt is hooked to the rotating member, and the other end is hooked to the fixed object, the spring applying a pressing force to the roller that is smaller than the initial tension set on the belt. ,
Belt whine noise prevention device.