JP3141112B2 - Belt pulley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt pulley.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional belt pulley transmits a driving force from a driving device such as an engine or a motor (not shown) to a pulley body 2 via a belt 1 to rotate the pulley body 2. Then, by rotating the input shaft 3 integrally fixed to the shaft center of the pulley body 2, the input shaft 3
, And various devices (not shown) connected thereto are driven.

Usually, a gear mechanism (not shown) such as a speed reducer or a speed increaser is mounted between the input shaft 3 and a device to be driven in order to adjust the number of rotations.

[0004] Reference numeral 4 denotes a casing of equipment or the like, and 5 denotes a bearing interposed between the input shaft 3 and the casing 4.

[0005]

However, the conventional belt pulley has the following problems.

That is, since the pulley body 2 and the input shaft 3 are integrally fixed, when a torque fluctuation occurs in a driving device such as an engine or a motor (not shown), the torque fluctuation is not directly shown via the input shaft 3. It will be transmitted to a gear mechanism such as a reduction gear or a speed increaser, and since the gear teeth constituting the gear mechanism are provided with backlash, the gear teeth strongly collide with each other due to torque fluctuation. Therefore, there is a problem that a loud rattle is generated.

The present invention has been made in view of the above circumstances, and has as its object to provide a belt pulley capable of preventing a gear mechanism or the like connected to an input shaft from generating a rattle due to torque fluctuation. Things.

[0008]

According to the present invention, there is provided a drive-side pulley body stretched over a belt, a gear mechanism connected to a driven-side input shaft, and a boss integrally formed at the tip of the input shaft. The pulley body is rotatably fitted to the boss via a needle bearing via a needle bearing, and the boss and the pulley body are connected to each other by a buffer member capable of returning to deformation. A stopper is protruded at a position corresponding to the above, and between both stoppers, a resin stopper piece is interposed between the outer circumference of the cylindrical portion of the boss and the inner circumference of the pulley body and has a gap in the circumferential direction, and further, The belt stopper pulley is characterized in that the resin stopper piece is made of a nylon-based resin mixed with 15 to 50% of glass so as to prevent the generation of teeth hitting sound and to make the resin stopper piece resistant to abrasion. It is.

[0009]

The operation of the present invention is as follows.

The pulley main body is rotatably fitted to the boss integrally mounted on the input shaft via a needle bearing and a resin stopper, and the boss and the pulley main body are connected by a cushioning member. When the torque fluctuation occurs, the shock absorbing member is deformed and the phase between the pulley body and the input shaft is shifted, so that the torque fluctuation is absorbed and the torque fluctuation can be prevented from being transmitted to the input shaft. The gear mechanism and the like can prevent rattle noise.

A stopper is provided at a position corresponding to the outer periphery of the boss and the inner periphery of the pulley main body. The stopper is sandwiched between the outer periphery of the boss and the inner periphery of the pulley main body while being circumferentially interposed between the two stoppers. Since the resin stopper piece is interposed with a gap, when the stopper and the resin stopper piece are engaged, the amount of phase shift between the boss and the pulley body is regulated. The amount of deformation is reduced, and damage due to excessive deformation of the cushioning member can be prevented.

Further, by mixing 15 to 50% of glass into the nylon resin constituting the resin stopper piece, the resin stopper piece is resistant to abrasion and does not generate a collision sound with the stopper. Can be.

[0013]

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

FIG. 1 and FIG. 2 show an embodiment of the present invention.

In the drawing, 1 is a belt, 3 is an input shaft, 4 is a casing, and 5 is a bearing interposed between the input shaft 3 and the casing 4.

A boss fitting bulging portion 6 is formed at the end of the input shaft 3, and a small diameter portion 8 of a stepped cylindrical boss 7 is integrally fitted and fixed to the boss fitting bulging portion 6. A cylindrical pulley main body 11 is rotatably fitted to the outer periphery of the large-diameter portion 9 through a ring-shaped needle bearing 10 coated with grease or the like. The outer periphery of the small-diameter portion 8 is connected to the outer periphery of the small-diameter portion 8 by using a buffer member 12 such as a disk-shaped rubber disk.

Further, the input shaft 3 of the large diameter portion 9 of the boss 7
As shown in FIG. 2, a plurality of stoppers 14 (only one is shown in FIG. 2) are protruded from the outer periphery of the distal end portion at intervals in the circumferential direction 13. A stopper 15 is provided on the inner periphery so as to sandwich the stopper 14 at intervals in the circumferential direction 13.
A resin stopper piece 17 made of resin is fitted with a predetermined gap 16 between them.

The resin stopper piece 17 is made of a nylon resin mixed with 15 to 50% of glass.

In the figure, reference numeral 18 denotes the input shaft 3 and the casing 4
, A seal provided on the rear side of the needle bearing 10, a seal ring provided on the distal end side of the needle bearing 10,
Reference numeral 21 denotes a resin spacer interposed between the bearing 5 and the casing 4.

Next, the operation will be described.

When the belt 1 is moved by using a drive device such as an engine or a motor (not shown), the pulley body 11 wound around the belt 1 rotates and is connected to the pulley body 11 via a buffer member 12 such as a rubber disk. Input shaft 3
Is rotated, and the driving force is transmitted to the device via a gear mechanism such as a speed reducer or a speed increaser (not shown) connected to the input shaft 3.

At this time, the pulley body 11 is rotatably supported via a needle bearing 10 on a boss 7 integrally attached to the input shaft 3, thereby restricting the movement in the radial direction.

When a torque fluctuation occurs in a driving device such as an engine or a motor (not shown), the pulley body 11
Cushioning member 1 such as a rubber disk connecting the shaft and the input shaft 3
2 is deformed to absorb the influence of torque fluctuation. This prevents torque fluctuations from being transmitted to the input shaft 3 and preventing rattling noise from being generated in a gear mechanism such as a speed reducer or a speed increaser (not shown) connected to the input shaft 3.

When the cushioning member 12 such as a rubber disk is deformed to absorb the influence of torque fluctuation, the pulley body 1
A phase shift occurs between the boss 7 and the boss 7, but when the phase shifts by the gap 16, the stopper 14 formed on the boss 7 hits the resin stopper piece 17, and the resin stopper piece 1
By locking the stopper 15 formed on the pulley main body 11 via 7, the phase shift is regulated, so that the cushioning member 12 such as a rubber disk is prevented from being excessively deformed and damaged.

The resin stopper piece 17 is mainly made of a nylon-based resin. The hardness of the resin stopper piece 17 is increased by mixing 15% or more of glass into the nylon-based resin. By making the piece 17 resistant to abrasion, and by reducing the mixing ratio of the glass component to 50% or less,
The hardness of the resin stopper piece 17 becomes too high and the stopper 1
4 can be prevented from generating a collision sound.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the present invention.

[0027]

According to the belt pulley of the present invention, various excellent effects can be obtained as described below.

I) The pulley body is rotatably fitted to the boss integrally mounted on the input shaft via a needle bearing and a resin stopper, and the boss and the pulley body are connected by a buffer member. When the torque fluctuation occurs on the main body side, the buffer member is deformed, and the phase between the pulley main body and the input shaft is shifted, so that the torque fluctuation is absorbed and the torque fluctuation can be prevented from being transmitted to the input shaft, It is possible to prevent the gear mechanism or the like of the input shaft from generating a rattling sound.

II) Stoppers are respectively provided at positions corresponding to the outer periphery of the boss and the inner periphery of the pulley body, and are sandwiched between the stoppers by the outer periphery of the cylindrical portion of the boss and the inner periphery of the pulley body. Since the resin stopper piece is interposed with a gap, when the stopper and the resin stopper piece are engaged, the amount of phase shift between the boss and the pulley body is regulated. The amount of deformation is reduced, and damage due to excessive deformation of the cushioning member can be prevented.

III) By mixing 15 to 50% of glass into the nylon resin constituting the resin stopper piece, the resin stopper piece is resistant to abrasion and does not generate a collision sound with the stopper. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of one embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a schematic side sectional view of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 belt 3 input shaft 7 boss 10 needle bearing 11 pulley body 12 cushioning member 13 circumferential direction 14, 15 stopper 16 gap 17 resin stopper piece

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshiyuki Miyagi 3-1-1-15 Toyosu, Koto-ku, Tokyo Ishikawa Shima-Harima Heavy Industries Co., Ltd. Toni Technical Center (72) Inventor Kouji Asami Fuchu-cho, Aki-gun, Hiroshima Prefecture No.3-1 Shinchi Mazda Co., Ltd. (72) Inventor Go Go Go No.3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture No.3-1 Mazda Co., Ltd. (72) Kinya Okajima 4-3-Tsujido Shinmachi, Fujisawa-shi, Kanagawa Prefecture 2 N.K. Megrastic Co., Ltd. Yuhi Dormitory in the Fujisawa Plant (56) References JP-A 64-53668 (JP, U) JP-A 6-45132 (JP, U) JP-A 5-5- 61520 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16H 55/32-55/56

Claims (1)

(57) [Claims] 1. A drive-side pulley main body that is stretched over a belt, a gear mechanism is connected to a driven-side input shaft, a boss is integrally attached to a tip of the input shaft, and a needle bearing is mounted on the boss. The pulley body is rotatably fitted to the outside through the boss, and the boss and the pulley body are connected by a buffer member capable of being deformed and returned, and stoppers are respectively provided at positions corresponding to the outer periphery of the cylindrical portion of the boss and the inner periphery of the pulley body. Protruding, between the stoppers, sandwiched between the outer periphery of the cylindrical portion of the boss and the inner periphery of the pulley body, with a gap in the circumferential direction and interposed a resin stopper piece to further prevent the occurrence of tooth hammering noise In addition, the resin stopper piece is 15 to 50 so as to make the resin stopper piece resistant to abrasion.
A belt pulley comprising a nylon resin mixed with percent glass.