JPH0714258U - Transmission member made of synthetic resin - Google Patents

Abstract

(57) [Abstract] [Purpose] To solve a quality problem that occurs in a synthetic resin transmission member provided with an elastic member for preventing abnormal noise. [Structure] A synthetic resin gear 5 mounted on a rotary shaft 2 of an electromagnetic clutch incorporates a felt 16 as an elastic member for preventing vibration of the gear 5. The felt 16 is a felt made of a fiber bundle formed by aligning fibers of acrylic, polyester, nylon, etc. in the longitudinal direction, immersing the fibers in a thermosetting resin, and applying heat and pressure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a synthetic resin material transmission member having an elastic member for damping vibration.

[0002]

[Prior art]

 Conventionally, an electromagnetic clutch provided with a transmission member made of a synthetic resin material has been disclosed in Japanese Utility Model Publication No. 60-173727 and Japanese Utility Model Publication No. 61-50832. The former electromagnetic clutch uses a gear boss to prevent abnormal noise caused by the difference in thermal expansion coefficient between the rotating shaft and the synthetic resin gear, and the variation in the friction coefficient due to the surface roughness of the sliding part. A recess is provided on the inner peripheral surface of the part, and this recess is filled with the felt as an elastic member by compression.

Also, in the latter electromagnetic clutch, in order to prevent abnormal noise, a leaf spring as an elastic member having a sliding surface as a Teflon coating layer is inserted in a recess formed in the inner peripheral surface of the boss portion of the gear. .

[0004]

[Problems to be solved by the device]

 There is no specific description of what type of felt is used in the former synthetic resin gear made up of the electromagnetic clutch, but if a general needle felt is used, the felt will be It is unwound and gets caught in the sliding part (between the rotating shaft and the gear).

That is, since the needle felt is manufactured by unwounding wool or synthetic fiber with a cotton-dissolving machine and compressing and punching with a needle punching device, the unwounding of the cut portion of the long felt is felt. Not only that, but also the unwound state occurs on the punching surface. In addition, in place of such a needle felt, even with a molding felt fixed by immersing it in a resin liquid mainly composed of a thermosetting resin such as epoxy phenol, satisfactory results could not be obtained in the durability test, It had the same quality problem as the needle felt.

On the other hand, in the latter case of the synthetic resin material gear configured in the electromagnetic clutch, a leaf spring as an elastic member must be incorporated, so that the assembly work is troublesome and the leaf spring does not fall off from the gear. There was a problem that I had to keep it in place.

[0007] Although an embodiment is shown in which a leaf spring is inserted into the recess of the gear so that the center of the gear that thermally expands is eccentric with respect to the center of the rotating shaft, it is difficult to set the spring force of the leaf spring. If the load on the rotating shaft side is small, the gear and rotating shaft may rotate together, which is not suitable for practical use.

[0008]

[Means for Solving the Problems]

 The applicant has developed a transmission member made of a synthetic resin material for practical use through such a trial test. One of them is that the elastic member is a fiber such as acrylic / polyester / nylon in the longitudinal direction. The felt was made of fiber bundles that were aligned, coated with an adhesive and fixed under pressure or immersed in a thermosetting resin to be heated and pressed, and this felt was incorporated into the boss portion of the synthetic resin transmission member.

When such a felt is used, it has excellent durability unlike the unwound / compressed felt, and the quality problem can be improved. Further, unlike the conventional case, it is only necessary to press-fit the felt, which has been shaped and solidified into a predetermined shape in advance, into the transmission member without compressing and filling the recess of the transmission member, and there is little variation in the fitting tolerance of the hole and the shaft. A transmission member made of a synthetic resin material that is satisfactory in design can be obtained.

As another one, the elastic member is a flexible portion having an elastically deformable elastic piece and a fitting portion at the tip of the elastic piece, and is integrally formed on the boss portion of the synthetic resin material transmission member. By doing so, unlike the conventional leaf spring, the assembly is facilitated, and it is not necessary to provide a special falling prevention means. In addition, variation in fitting tolerance between the preformed flexible portion and the rotary shaft is reduced, and a transmission member made of a synthetic resin material that is satisfactory in design can be obtained.

[0011]

[Action]

 Since the synthetic resin material transmission member is attached to the rotating shaft through an elastic member made of a felt made of fiber bundles arranged on the inner peripheral surface of the boss portion and a flexible portion integrally formed on the boss portion, The vibration acting during the rotation is damped by the elastic member, and the generation of abnormal noise is prevented.

[0012]

【Example】

 1 and 2 show an electromagnetic clutch including a synthetic resin transmission member according to the present invention, which shows a micro electromagnetic clutch incorporated in a paper feeding mechanism of a copying machine. FIG. 1 is a side view of the upper half in section, and FIG. 2 is a front view of the synthetic resin transmission member of FIG.

A cylindrical rotary shaft 2 made of a sintered alloy material is mounted on the paper feed roller shaft 1, and a D cut portion 1a of the roller shaft 1 and a D-shaped hole 2a of the rotary shaft 2 are fitted to each other. As a result, the roller shaft 1 and the rotary shaft 2 can rotate integrally. A disk-shaped rotor 3 is fitted and fixed on the rotating shaft 2, an exciting device 4 is supported on the back side of the rotor 3, and a synthetic resin material transmission member is mounted on the front side of the rotor 3. The gear 5 is supported.

The exciter 4 has a cylindrical shape in which an inner magnetic path member 6 including a cylindrical portion 6 a and a disc portion 6 b and an outer peripheral surface of the disc portion 6 b of the inner magnetic path member 6 are press-fitted with an opening end portion. A coil bobbin 9 around which the electromagnetic coil 8 is wound, and a cylindrical insulating cover 10 fitted to the outer periphery of the coil bobbin 9 are incorporated in the annular groove. . Reference numeral 11 is a thrust washer interposed between the end surface of the cylindrical portion 6a of the exciter 4 and the back surface of the rotor 3, and reference numeral 12 is press-fitted onto the rotary shaft 2 as a retaining member of the exciter 4. It is a ring.

The gear 5 has a tooth portion 5 a and a boss portion 5 b having a shaft hole into which the rotary shaft 2 is inserted. The end surface of the boss portion 5 b is slidably brought into contact with the front surface of the rotor 3, and the rotary shaft 2 The ring 13 is press-fitted into the rotary shaft 2 to prevent it from coming off.

A disc-shaped armature 14 facing the front surface of the rotor 3 with a predetermined air gap G is supported on the gear 5 by a leaf spring 15 so as to be movable in the axial direction. The armature 14 is magnetically attracted to the rotor 3 against the spring force of the leaf spring 15 by the magnetic flux generated by energizing the armature 14.

Next, the felt 16 as an elastic member, which is one of the features of the present invention, will be described. The inner peripheral surface 5c of the gear 5 is provided with an axial hole 5d opening to the inner peripheral surface 5c with the center slightly outside the inner peripheral surface 5c, and the felt 16 as an elastic member is provided with a felt 16 as an elastic member. It is press-fitted until it hits the deepest part. The felt 16 is provided so as to protrude from the inner peripheral surface 5c of the gear 5 toward the center. It should be noted that in the embodiment, the structure is arranged at three equally divided positions in the circumferential direction.

The felt 16 has, for example, acrylic fibers, polyester fibers, nylon fibers, etc., aligned in the longitudinal direction, coated with an adhesive, or dipped in a resin liquid containing a thermosetting resin such as an epoxy resin or a phenol resin as a main component, It is a rod-shaped felt that is shaped and solidified by passing it through a heated nozzle.

Further, both ends of the felt 16 that is drawn from a heated nozzle and cut into a predetermined size are not converged into a cut circular cross section but are pressed and converged. Furthermore, this felt 16 is configured as an oil-impregnated felt impregnated with lubricating oil. The end surface of the felt 16 is slightly lower than the end surface of the gear 5 so that the end surface of the ring 13 and the end surface of the felt 16 do not come into sliding contact with each other.

Since the rotation of the drive source is transmitted to the gear 5 in the electromagnetic clutch provided with the synthetic resin transmission member (gear) 5 having such a structure, the magnetic flux of the electromagnetic coil 8 causes the armature 14 to move. By being magnetically attracted to the rotor 3, the rotation is transmitted to the rotary shaft 2 and the roller shaft 1. When the electromagnetic coil 8 is de-energized, the armature 14 is separated from the rotor 3 by the spring force of the leaf spring 15, so that the gear 5 idles on the rotating shaft 2.

Therefore, in the idling gear 5, vibration occurs due to the difference in the thermal expansion coefficient between the rotating shaft 2 and the gear 5 and the variation in the friction coefficient due to the surface roughness of the sliding portion. Since this vibration is absorbed and attenuated by the felt 16 as an elastic member, the generation of abnormal noise can be prevented.

According to the applicant's trial test, the felt 16 is made by aligning fibers of acrylic, polyester, nylon, etc. in the longitudinal direction, applying an adhesive, fixing by pressure, or immersing in a thermosetting resin and heating. Since the felt is made of fiber bundles that are shaped into filaments by pressing, the felt that has been shaped by being unwound and compressed in the conventional manner and the raw material that has been unwound in the same way are dipped in thermosetting resin. Unlike a felt shaped by heating and pressurizing, it has excellent defibration resistance in the portion that is in sliding contact with the rotating shaft 2.

In particular, since the felt 16 in this embodiment is shaped so that both ends cut into a rod shape are also dipped in the thermosetting resin and squeezed to be converged, it is possible to obtain a felt having excellent unwounding resistance. did it. In the examples, the elastic member made of a rod-shaped felt was illustrated, but the shape and the assembly to the transmission member, such as a ring-shaped felt having the entire inner peripheral surface in sliding contact with the rotating shaft, are used. The structure is not limited to that of the embodiment.

Next, another embodiment of the present invention will be described. 3 is a sectional view of a gear as a transmission member made of a synthetic resin material, FIG. 4 is a front view of FIG. 3, FIG. 5 is a rear view of FIG. 3, and FIG. 6 is an enlarged view of a main part of FIG. At the boss portion of the gear 17 shown in these drawings, a mounting surface 17a for screwing a base end portion 15a of a leaf spring 15 for elastically supporting the armature 14 and an abutting surface that abuts against the rotor 3 (see FIG. 1). A surface 17b and a stopper surface 17c that contacts the armature 14 are formed.

As shown in the front view of FIG. 5, the gear 17 has through holes 18 formed at positions where the boss portion is divided into three equal parts in the circumferential direction, and the end surface of the boss portion is opened to the through hole 18. A pair of grooves 19 are formed. The through hole 18 and the pair of grooves 19 form a flexible portion 20 as an elastic member.

As shown in the enlarged view of FIG. 6, the flexible portion 20 has a root portion formed on the side of the small diameter portion of the boss portion where the abutment surface 17b to the rotor 3 is formed, and cantilevered support at this root portion. The elastic piece 20a and the fitting portion 20b at its tip are formed by the above structure. The fitting portion 20b is provided so as to protrude toward the center by about 0.025 mm so that the diameter of the fitting portion is 1295 mm with respect to the shaft hole diameter of 13 mm.

The gear 17 having such a structure is rotatably fitted and mounted on the rotating shaft 2 like the gear 5 described in the above embodiment. The vibration of the gear 17 during idling is absorbed and attenuated by the flexible portion 20, so that the generation of abnormal noise can be prevented.

[0028]

[Effect of device]

 As described above, according to the first invention, since the elastic member is the felt made of the fiber bundle in which the fibers of acrylic, polyester, nylon, etc. are aligned in the longitudinal direction and shaped, a general cotton unwinding pressure treatment is performed. The durability as an elastic member was improved unlike the produced felt, and the improvement in quality was achieved.

In the second invention, the elastic member is a flexible portion having an elastically deformable elastic piece and a fitting portion at the tip of the elastic piece, and is integrally formed on the boss portion of the synthetic resin material transmission member. Assembling into the equipment is simple, there is little variation in fitting tolerance, and the labor for quality control is reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of an upper half of an electromagnetic clutch having a synthetic resin transmission member according to a first invention.

FIG. 2 is a rear view of the synthetic resin material transmission member of FIG.

FIG. 3 is a cross-sectional view of a transmission member made of a synthetic resin material according to a second invention.

4 is a front view of the synthetic resin material transmission member of FIG. 3. FIG.

5 is a rear view of the synthetic resin transmission member of FIG.

FIG. 6 is an enlarged view of a main part of the synthetic resin material transmission member of FIG.

[Explanation of symbols]

 5 Synthetic resin material gear 16 Felt as elastic member 17 Synthetic resin material gear 20 Flexible part as elastic member

Claims (2)

[Scope of utility model registration request] 1. A synthetic resin transmission member having an elastic member for damping vibration arranged on a boss portion, wherein the elastic member is a felt made of fiber bundles aligned in the longitudinal direction. Transmission member made of resin material. 2. A transmission member made of a synthetic resin material, wherein an elastic member for damping vibration is arranged on a boss portion, and a flexible member having an elastic piece capable of elastically deforming the elastic member and a fitting portion at a tip of the elastic piece. A transmission member made of a synthetic resin material, which is integrally formed with the boss portion as a portion.