CN215980709U - Transmission gear assembly - Google Patents

Abstract

The utility model relates to the transmission technology, and provides a transmission gear assembly, which comprises: the gear (1) and the bearing (2) of ring structure, wherein bearing (2) are installed inside gear (1), are interference fit or excessive fit between gear (1) and bearing (2). The gear assembly of the utility model converts direct friction between plastics into ball friction inside the bearing, reduces or even completely removes abrasion of the shaft position, and prolongs the service life of parts.

Description

Transmission gear assembly

Technical Field

The present invention relates to gear technology, and more particularly, to a transmission gear assembly.

Background

The current fixing device of copying machines and printers is constructed such that a transmission gear is slidably fitted to a main body of a large frame, and fig. 1 shows a transmission gear of the prior art. The fuser drives the transmission gear 5 to be located at the right side lower left corner of the fuser, lubricating oil is smeared at the friction position between the transmission gear and the bearing, the lubricating oil is invalid along with increase of service time, inner holes and shaft positions of the transmission gear are subjected to dry grinding, so that abrasion of the inner holes and the shaft positions of the transmission gear is caused, finally, the inner holes of the transmission gear are enlarged, gear mounting shafts on a large frame main body are seriously abraded, and the gear is invalid after the center distance between two meshing teeth is enlarged to a certain degree.

The transmission gear is the only power transmission part of the printer main body and the fuser and provides power for all transmission of the fuser, so that the gear is required to have certain strength in the transmission process, and the inner wall of the gear bears the radial force of the large frame and the friction generated when the gear rotates when the gear is meshed. Such a structure may cause severe wear of one part having a lower strength after a long time operation, and eventually may cause a gear transmission failure to cause an insufficient life of the entire fuser.

SUMMERY OF THE UTILITY MODEL

To address the problems of the background art, the present invention provides a transmission gear assembly, comprising: the gear and the bearing are of a circular ring structure, wherein the bearing is installed inside the gear, and the gear and the bearing are in interference fit or over fit.

Optionally, one side of the gear has an opening through which the bearing is placed into the gear.

Optionally, the opening has a chamfer.

Optionally, the bearing is a ball bearing, a ball bearing or a roller bearing.

Optionally, the transmission gear assembly further comprises: the anti-abrasion gasket is arranged on the inner side of the bearing.

Optionally, the wear pad is annular.

Optionally, the transmission gear assembly further comprises: and the gap gasket is arranged on the outer side of the bearing.

Optionally, the gap spacer is annular.

The beneficial effects of the utility model include: the gear assembly of the utility model converts direct friction between plastics into friction of balls inside the bearing, reduces or even completely removes abrasion of a shaft, and the shaft only needs to bear radial force given by the meshing of the gear in transmission, thereby achieving the purpose of prolonging the service life.

Drawings

In order that the utility model may be more readily understood, it will be described in more detail with reference to specific embodiments thereof that are illustrated in the accompanying drawings. These drawings depict only typical embodiments of the utility model and are not therefore to be considered to limit the scope of the utility model.

Figure 1 shows the structure of a prior art transmission gear assembly.

Figure 2 shows the position of the drive gear assembly of the present invention.

Fig. 3 shows an exploded view of the transmission gear assembly of the present invention.

Figure 4 shows a view of the assembly of the transmission gear assembly of the present invention to a support.

Fig. 5 shows a perspective view of the drive gear assembly of the present invention.

Reference numerals

1-a gear; 2-a bearing; 3-an anti-abrasion gasket; 4-a gap spacer; 5-fuser drive transmission gear.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings so that those skilled in the art can better understand the present invention and can carry out the present invention, but the illustrated embodiments are not intended to limit the present invention, and technical features in the following embodiments and embodiments can be combined with each other without conflict, wherein like parts are denoted by like reference numerals.

As shown in fig. 2, the transmission gear assembly of the present invention is a split structure, including: gear 1 and bearing 2.

Wherein one side of gear 1 is open structure for hold bearing 2, and bearing 2 is wrapped up in gear 1's inside, has guaranteed that bearing 2's cleanness has also guaranteed holistic pleasing to the eye. The bearing 2 is in a circular ring structure, and the bearing 2 is sleeved on a shaft bracket of the fixer. The shaft bracket of the fixer is generally made of plastic, and in order to prevent the abrasion of the inner ring of the bearing 2 to the plastic from increasing, the resistance is increased, and serious abrasion is caused. The aperture of the bearing 2 of the utility model is also processed with the clearance treatment (the clearance design is mainly to avoid the abrasion of the inner side of the gear caused by the rotation of the inner ring of the bearing, the design standard is that the appearance is slightly larger than the outer diameter of the inner ring of the bearing, the depth is random), the aperture size can meet the working strength of the gear, and the abrasion can be reduced. The stable process can be formed by adjusting the die and adjusting the injection molding process, the production of the gear can be ensured, and the two parts of the gear can be assembled integrally by using a special tool matched with a pneumatic press.

The dimensional tolerances of the opening and depth of the gear 1 are also designed, preferably with an interference fit between the gear 1 and the bearing 2. The structure can replace the direct friction between the inner wall of the gear and the big frame body of the fixer in the prior art by the rotation of the bearing, so that the big frame body of the fixer only needs to bear the radial force when the gear is meshed.

As shown in fig. 3, in order to avoid the problems of slipping and falling between the gear 1 and the bearing 2, the outer diameters of the gear 1 and the bearing 2 are designed to be in interference fit or over-fit. Furthermore, the bore of the gear 1, which is intended to receive the bearing 2, has a large chamfer. During assembly, the bearing 2 can be pressed into the gear 1 by using a special tool matched with a pneumatic press. By comparing the two configurations, it is clear that the rotational life of the bearing 2 is much greater than the life of direct friction between plastics. The large frame main body of the fixer is an integrated injection molding part, the gear with the structure can obviously reduce the requirement of injection molding raw materials of the large frame main body on the strength, and simultaneously can ensure that the gear cannot be damaged in the whole service life of the fixer.

Preferably, the inner bore of the bearing 2 and the large frame body shaft of the fuser are also interference fit, the bearing 2 may be a ball bearing, so that the rolling of the balls inside the bearing replaces the sliding fit between the transmission gear and the large frame body shaft of the prior art, the life and stability of the bearing 2 is higher, and the fuser assembly also requires little gear replacement because there is little wear. The bearing 2 of the utility model ensures stable transmission and accurate gear meshing in the service life of the fuser part. The fuser with the improved structure operates for more than 100 hours through the simulation of the aging instrument, the gear state is good after the fuser is continuously printed on a machine, the shaft position of a large frame main body of the fuser is not worn, and the fuser operates well. Optionally, the bearing is a ball bearing, a ball bearing or a roller bearing.

Preferably, the gear assembly of the present invention further comprises an anti-wear shim 3 and a clearance shim 4. An anti-wear pad 3 is mounted on the inside of the gear 1 (the inside being the side where the bearing 2 is fitted into the gear 1). The gap washer 4 is mounted on the outside of the gear 1 (the outside refers to the side opposite to the side where the bearing 2 is mounted in the gear 1).

The anti-abrasion gasket 3 separates a rotating gear (mainly a bearing) from the plastic base to prevent the abrasion of the rotating inner ring of the gear to the plastic bracket of the fixer base, and the anti-abrasion gasket 3 is preferably a PET sheet with better abrasion resistance. The gap washer 4 prevents the rotating gear from wearing against the plastic bracket of the positioning gear on the plastic bracket of the upper cover of the fuser. The shapes, thicknesses and materials of the anti-abrasion gasket 3 and the gap gasket 4 can be adjusted according to actual installation environments.

The embodiments described above are merely preferred specific embodiments of the present invention, and the present specification uses the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the present disclosure. General changes and substitutions by those skilled in the art within the technical scope of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A drive gear assembly, comprising:

the gear (1) and the bearing (2) of ring structure, wherein bearing (2) are installed inside gear (1), are interference fit or excessive fit between gear (1) and bearing (2).

2. The drive gear assembly as recited in claim 1,

one side of the gear (1) is provided with an opening, and the bearing (2) is placed into the gear (1) through the opening.

3. The drive gear assembly as recited in claim 2,

the opening has a chamfer.

4. The drive gear assembly as recited in claim 1,

the bearing (2) is a ball bearing, a ball bearing or a roller bearing.

5. The drive gear assembly as recited in claim 1, further comprising:

the anti-abrasion gasket (3) is arranged on the inner side of the gear (1).

6. The drive gear assembly of claim 5,

the anti-abrasion gasket (3) is annular.

7. The drive gear assembly as recited in claim 1, further comprising:

the gap gasket (4), the gap gasket (4) is installed on the outside of the gear (1).

8. The drive gear assembly of claim 7,

the gap gasket (4) is annular.

Images