CN217108101U

CN217108101U - Plastic spiral bevel gear for sewing machine

Info

Publication number: CN217108101U
Application number: CN202220968240.0U
Authority: CN
Inventors: 陈国新
Original assignee: Lishui Xinboge Technology Co ltd
Current assignee: Lishui Xinboge Technology Co ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-08-02
Anticipated expiration: 2032-04-24

Abstract

The utility model discloses a plastic spiral bevel gear used on sewing machinery, which comprises a core part made of metal and a gear which is formed in the core part by injection molding of engineering plastics; the core part is provided with an installation part, and the peripheral side surface of the installation part is provided with a plurality of grooves for embedding the engineering plastics of the gear. The spiral bevel gear made of rigid metal is replaced, so that the noise of the gear in transmission is reduced, the noise is reduced by 5-10 dBA compared with that of the similar metal gear, and the product competitiveness is improved; meanwhile, the gear supported by the engineering plastics has the characteristics of self-lubrication, light weight and the like which are lacked by the spiral bevel gear supported by the metal material, and is particularly suitable for being used on sewing machinery.

Description

Plastic spiral bevel gear for sewing machine

Technical Field

The utility model belongs to the technical field of mechanical transmission and specifically relates to indicate a plastics spiral bevel gear who is used in sewing machine tool.

Background

Compared with a straight bevel gear, the spiral bevel gear has the advantages of large contact ratio, high bearing capacity, stable transmission, high strength and the like. For example, the equidistant spiral bevel gear disclosed in chinese utility model CN201354837Y is manufactured by die forming methods such as powder forging and metal cold and hot forging, but the spiral bevel gear made of metal has high noise of gear transmission during use. And the patent provides only a theoretical form of equidistant spiral bevel gears. In practical application, the small gears are equidistant spiral bevel gears, and the large gears matched with the small gears are spiral bevel gears which must be modified according to the conjugate principle. Otherwise, interference or jamming problems can occur during installation and use.

Therefore, a new technical solution is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a plastic spiral bevel gear for sewing machine, which can effectively solve the problem of the conventional spiral bevel gear made of metal with high transmission noise.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a plastic spiral bevel gear used on sewing machine comprises a core made of metal and a gear injection molded on the core by engineering plastics; the core is provided with the installation department, the week side of installation department is provided with the slot of the engineering plastics embedding of a plurality of confession gears.

Further, the grooves include axial grooves arranged in the axial direction of the core.

Further, the grooves include radial grooves arranged in a radial direction of the core.

Furthermore, the circumferential side surface of the mounting portion is provided with a plurality of raised lines at intervals along the radial direction, each raised line extends along the axial direction of the mounting portion, and every two raised lines form an axial groove.

Further, the radial grooves are formed by recessing from the surfaces of the plurality of convex strips toward the center of the mounting portion.

Still further, the depth of the radial grooves is greater than the depth of the axial grooves.

Further, the gears are equidistant spiral bevel gears, and the tooth profiles of the gears are modified spherical involutes.

Further, the gear is provided with a buttress ring for reinforcing the strength of the gear.

Further, the core is provided with a shaft hole into which a shaft body of a mechanical device is inserted.

Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly, can know by above-mentioned technical scheme:

1. the gear which is injection molded on the core part by engineering plastics is arranged, so that the traditional spiral bevel gear which is made of rigid metal is replaced, the noise of the gear in transmission is favorably reduced, the noise is reduced by 5-10 dBA compared with the similar metal gear, and the competitiveness of the product is improved; meanwhile, the gear supported by the engineering plastics has the characteristics of self-lubrication, light weight and the like which are lacked by the spiral bevel gear supported by the metal material, and is particularly suitable for being used on sewing machinery;

2. the core part made of metal is provided with the mounting part for injection molding of the gear, so that the spiral bevel gear forms a composite structure, and the core part made of metal can provide rigid support for the gear; the mounting part is provided with a groove for embedding engineering plastics into the groove when the gear is injection molded, so that the core part and the gear are tightly and firmly connected;

3. the gear is provided with a buttress ring for enhancing the strength of the gear, and each convex tooth of the gear is connected with the buttress ring, so that the strength of the gear can be further improved, and the mechanical property of engineering plastics is fully utilized; meanwhile, the tooth profile of the gear is arranged in a modified spherical involute mode, and when the large gear and the small gear are meshed and connected, the problem of interference or clamping stagnation during installation and use can be reduced.

To illustrate the structural features and functions of the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is an exploded view of the core and gears of the preferred embodiment of the invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a cross-sectional view of the core of the preferred embodiment of the invention;

fig. 4 is a schematic view of a transmission structure of a plastic spiral bevel gear according to a preferred embodiment of the present invention.

The attached drawings indicate the following:

1. a core; 11. an installation part; 12. a trench; 121. an axial groove; 122. a radial groove; 123. a convex strip; 13. a shaft hole; 131. a pin hole;

2. a gear; 21. a buttress ring.

Detailed Description

Referring to fig. 1 to 4, a plastic spiral bevel gear for a sewing machine according to a preferred embodiment of the present invention is shown, which includes a core 1 and a gear 2.

Referring to fig. 1 to 3, the core 1 is made of metal, the core 1 is provided with a mounting portion 11, and the mounting portion 11 is provided with a groove 12; the gear 2 is injection molded from engineering plastic in the mounting portion 11 of the core 1 via a mold, and the engineering plastic of the gear 2 is fitted into the groove 12. Specifically, the core 1 is provided with a mounting portion 11 to which the gear 2 is injection molded, so that the helical bevel gear constitutes a composite structure, and the core 1 made of metal can provide rigid support for the gear 2; the mounting part 11 is provided with a groove 12, so that engineering plastics can be embedded into the groove 12 when the gear 2 is injection molded, and the core part 1 and the gear 2 are tightly and firmly connected; the gear 2 made of engineering plastics replaces the traditional gear made of metal materials, so that the gear 2 has the characteristics of good noise reduction performance, self-lubricating performance, light weight and the like; the core part 1 made of metal is used for reinforcing the rigid support of the transmission shaft, so that the transmission shaft can be installed on the mechanical transmission shaft.

As shown in fig. 1 to 3, the grooves 12 include axial grooves 121 disposed axially along the core 1 and radial grooves 122 disposed radially along the core 1; specifically, the circumferential side surface of the mounting portion 11 is provided with a plurality of protruding strips 123 at intervals along the radial direction thereof, each protruding strip 123 extends along the axial direction of the mounting portion 11, and each two protruding strips 123 form an axial groove 121; specifically, the radial grooves 122 are recessed from the surfaces of the protrusions 123 toward the center of the mounting portion 11, and the depth of the radial grooves 122 is greater than the height of the protrusions 123, that is, the radial grooves 122 are also recessed on the surface of the mounting portion 11, so that the depth of the radial grooves 122 is greater than the depth of the axial grooves 121, and the engineering plastic of the gear 2 can be embedded into the axial grooves 111 and the radial grooves 122 to achieve tight and firm connection.

As shown in fig. 3, the cross sections of the raised lines 123 are trapezoidal, and a rounded corner is arranged at each corner, so that the injection molding of the gear 2 and the mounting part 11 is more reliable, and a cavity phenomenon cannot occur; moreover, each convex strip 123 is gradually widened from top to bottom, and the radial grooves 122 are arranged at the positions lower than the middle parts of the convex strips 123, so that the structure further improves the connection firmness between the gear 2 and the core 1. Preferably, the gear 2 is an equidistant spiral bevel gear, and the tooth profile of the gear 2 is a modified spherical involute; the gear 2 manufactured by the structure is beneficial to rotary demoulding after injection moulding by using a mould. The gear 2 is provided with a buttress ring 21 for reinforcing the strength of the gear 2; one end of a plurality of convex teeth of the gear 2 is connected with the buttress ring 21, so that the strength of the gear 2 can be further improved, and the mechanical property of engineering plastics is fully utilized.

Referring to fig. 3 and 4, the core 1 is provided with a shaft hole 13 into which a shaft body of a mechanical device is inserted, the shaft hole 13 penetrates through the upper and lower surfaces of the core 1, the side surface of the core 1 is provided with a pin hole 131 communicating with the shaft hole 13, the core 1 is inserted into the shaft body of the mechanical structure, and then a pin shaft penetrates through the pin hole 131 and is inserted into a corresponding hole of the shaft body, so that the assembly of the plastic spiral bevel gear can be completed.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims

1. A plastic spiral bevel gear for a sewing machine, characterized in that: comprises a core part (1) made of metal and a gear (2) which is formed on the core part (1) by injection molding of engineering plastics; the core (1) is provided with an installation part (11), and the peripheral side surface of the installation part (11) is provided with a plurality of grooves (12) for embedding the engineering plastics of the gear (2).

2. A plastic spiral bevel gear for use in a sewing machine according to claim 1, wherein: the grooves (12) comprise axial grooves (121) arranged axially along the core (1).

3. A plastic spiral bevel gear for use in a sewing machine according to claim 1 or 2, wherein: the grooves (12) comprise radial grooves (122) arranged along the radial direction of the core (1).

4. A plastic spiral bevel gear for use in a sewing machine according to claim 3, wherein: the circumferential side surface of the mounting portion (11) is provided with a plurality of protruding strips (123) at intervals along the radial direction of the mounting portion, each protruding strip (123) extends along the axial direction of the mounting portion (11), and every two protruding strips (123) form an axial groove (121).

5. The plastic spiral bevel gear for use in a sewing machine according to claim 4, wherein: the radial grooves (122) are formed by being recessed from the surfaces of the convex strips (123) towards the center direction of the mounting part (11).

6. The plastic spiral bevel gear for use in a sewing machine according to claim 5, wherein: the depth of the radial groove (122) is greater than the depth of the axial groove (121).

7. A plastic spiral bevel gear for use in a sewing machine according to claim 1, wherein: the gear (2) is an equidistant spiral bevel gear, and the tooth profile of the gear (2) is a modified spherical involute.

8. A plastic spiral bevel gear for use in a sewing machine according to claim 1, wherein: the gear (2) is provided with a buttress ring (21) for reinforcing the strength of the gear (2).

9. A plastic spiral bevel gear for use in a sewing machine according to claim 1, wherein: the core (1) is provided with a shaft hole (13) into which a shaft body of a mechanical device is inserted.