CN210920022U - Powder metallurgy internal gear structure - Google Patents

Abstract

The utility model relates to a powder metallurgy internal gear structure, include: a ring body; the inner teeth are integrally formed on the inner ring surface of the ring body to form a complete circle; the flange the outer ring face of ring body is personally submitted 120 jiaos array shaping and has threely, the flange with the axial terminal surface of ring body parallel and level is equipped with circular arch, the surface of flange is close to circular arch is equipped with the axial setting, convex rib, the rib is kept away from circular bellied one end is axial extension's inclined plane, the ring body the internal tooth the flange circular arch with the rib is formed by powder metallurgy integrated into one piece. The flange and the ribs can effectively prevent the circumferential direction of the mounted part from rotating, and the circular bulge can effectively increase axial pre-pressing to prevent transmission; the flanges are arranged in an array of 120 degrees, so that the stress is balanced, and the service life is prolonged; the ring body, the inner teeth, the flanges, the circular protrusions and the ribs are formed by powder metallurgy in a one-piece mode, manufacturing is convenient, batch production is convenient, ingredients are uniform, and strength is high.

Description

Powder metallurgy internal gear structure

Technical Field

The utility model relates to a small-size gear box motor technical field especially relates to a powder metallurgy internal gear structure.

Background

The regulation of car electric seat needs to be controlled through small-size gear box motor, and small-size gear box motor generally carries out the transmission conversion through the planet wheel structure, and the planet wheel meshes the sun gear through the internal gear that does not rotate as the track and carries out the transmission conversion, and the internal gear if the orbital role of taking as takes place to rotate or axial vibration, leads to the planet wheel drunkenness easily, and the transmission ratio precision descends the error increase, and transmission effect is low, and the noise is big.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a powder metallurgy internal gear structure that prevents play.

In order to solve the technical problem, the utility model discloses a technical scheme be: a powder metallurgy internal gear structure comprising: a ring body; the inner teeth are integrally formed on the inner ring surface of the ring body to form a complete circle; the flange the outer ring face of ring body is personally submitted 120 jiaos array shaping and has threely, the flange with the axial terminal surface of ring body parallel and level is equipped with circular arch, the surface of flange is close to circular arch is equipped with the axial setting, convex rib, the rib is kept away from circular bellied one end is axial extension's inclined plane, the ring body the internal tooth the flange circular arch with the rib is formed by powder metallurgy integrated into one piece.

Furthermore, the internal teeth are in involute tooth forms.

Furthermore, the outer edges of the ribs are provided with rounded corners.

Furthermore, one end of the flange is flush with the axial end face of the ring body, and the other end of the flange is in the outer ring face.

Furthermore, the two ends of the flange are flush with the axial end face of the ring body, and the circular protrusions are arranged on the end faces of the same face of the three flanges.

Further, the number of teeth of the internal teeth is fifty-four.

Further, the ratio of the height of the internal teeth to the thickness of the ring body is 0.75-0.85.

Further, the axial length of the flange is 0.8-0.92 of the width of the ring body.

Further, the length of the ribs is 0.4-0.5 of the axial length of the flange.

The beneficial effects of the utility model reside in that: the flange and the ribs can effectively prevent the circumferential direction of the mounted part from rotating, and the circular bulge can effectively increase axial pre-pressing to prevent transmission; the flanges are arranged in an array of 120 degrees, so that the stress is balanced, and the service life is prolonged; the ring body, the inner teeth, the flanges, the circular protrusions and the ribs are formed by powder metallurgy in a one-piece mode, manufacturing is convenient, batch production is convenient, ingredients are uniform, and strength is high.

Drawings

FIG. 1 is a schematic structural diagram of an internal gear structure in powder metallurgy according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another direction of the internal gear structure in powder metallurgy according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of another direction of the internal gear structure in powder metallurgy according to the embodiment of the present invention.

Description of reference numerals:

10. a ring body; 20. internal teeth; 30. a flange; 31. a circular protrusion; 32. and (4) ribs.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description, with reference to the accompanying drawings and embodiments, will explain the present invention in further detail with respect to a powder metallurgy internal gear structure. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "axial," "radial," "inner," and "outer" are used with reference to the ring body, i.e., "axial" refers to the axial direction of the ring body, and other similar terms are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Referring to fig. 1-3, a powder metallurgy internal gear structure includes: a ring body 10; the inner teeth 20 are integrally formed on the inner ring surface of the ring body 10 to form a complete circle; flange 30, it has threely to appear 120 jiaos of array shaping at the outer ring surface of ring body 10, and flange 30 is equipped with circular arch 31 with the axial terminal surface of ring body 10 parallel and level, and the surface of flange 30 is close to circular arch 31 and is equipped with the axial setting, convex rib 32, and the one end that circular arch 31 was kept away from to rib 32 is axial extension's inclined plane, and ring body 10, internal tooth 20, flange 30, circular arch 31 and rib 32 are formed by powder metallurgy integrated into one piece.

The flange 30 and the ribs 32 can effectively prevent the circumferential rotation of the mounted part, and the circular bulge 31 can effectively increase axial pre-compression to prevent transmission; the flanges 30 are arranged in an array of 120 degrees, so that the stress is balanced, and the service life is prolonged; the ring body 10, the inner teeth 20, the flange 30, the circular protrusions 31 and the ribs 32 are formed by powder metallurgy in a one-piece mode, manufacturing is convenient, batch production is convenient, components are uniform, and strength is high. The arrangement of the inclined plane of the edge strip 32 facilitates assembly and accelerates production speed.

Preferably, a circular protrusion 31 is provided at the interface of the ring body 10 and the flange 30. The ring body 10 and the flange 30 support the circular protrusion 31 together, so that the axial bearing capacity is improved.

Referring to fig. 1 and 2, the ribs 32 are rounded, and the outer edges of the ribs 32 are rounded.

The fillets are arranged to prevent operators from being scratched, so that the outer edges are prevented from being damaged, and the shell in contact with the ribs 32 is prevented from being scratched.

Preferably, the circular protrusion 31 is provided with a rounded corner,

preferably, the internal teeth 20 are involute tooth profiles. The involute tooth profile can ensure the fixed transmission ratio transmission of the gear, the manufacturing process is mature, and the processing is convenient.

Referring to fig. 1-3, the flange 30 has one end flush with the axial end face of the ring body 10 and the other end in the outer annular surface.

The processing is convenient, and the processing precision requirement is low. Typically, both end faces of the internal gear need to be smoothed, the end of the flange 30 flush with the ring body 10 being smoothed, and the other end in the outer ring face requiring a low degree of surface smoothness. By the arrangement, the processing speed is improved, and the processing difficulty is reduced.

Preferably, the flange 30 is provided with a smooth finish on one side with the circular protrusion 31 and rounded corners between the remaining sides.

Preferably, the axial length of the flange 30 is 0.80-0.92 of the width of the ring body.

Reasonable structure, high strength and material saving.

Preferably, the width of the flange 30 is less than the length, and preferably, the width of the flange 30 is 0.82-0.88 of the length. The strength of the flange is high, and the flange is prevented from being broken.

Referring to fig. 1 and 2, the number of teeth of the inner teeth 20 is fifty-four. It can be understood that the number of teeth of internal tooth 20 can design by oneself as required, the utility model discloses only according to the actual production condition, provide a regulation preferred structural style who is fit for car power seat.

Referring to fig. 1-3, the beveled end of the ribs 32 is spaced from the flange. Preferably, the ribs 32 have a length of 0.4 to 0.5 of the axial length of the flange 30.

The setting of arris strip 32 makes things convenient for the internal gear to impress in the corresponding casing, and casing elasticity extrudes arris strip 32 to make the fixed root of internal gear stable, the length of arris strip is longer more, highly about high, and the extrusion force that receives is big more, and the assembly degree of difficulty also improves thereupon, specifically designs according to material, the elastic property of adaptation casing.

Preferably, the ratio between the height of the inner teeth 20 and the thickness of the ring body 10 is 0.75-0.85. The strength is high, the torque that can bear is strong, and the ring body 10 can provide effectual support for internal tooth 20.

Example two

Unlike the embodiment in which one end of the flange 30 is flush and the other end is in the ring body 10, both ends of the flange 30 are flush with the axial end face of the ring body 10, and the end faces of the three flanges 30 on the same face are provided with the circular protrusions 31. The rest is the same as the implementation one. The contact area of the end surface of the inner gear, which faces away from the circular bulge 31, is increased, and the axial pressure-bearing capacity is improved.

EXAMPLE III

The difference between the embodiment that one end of the flange 30 is flush and the other end is in the ring body 10 is that two ends of the flange 30 are flush with the axial end face of the ring body 10, the two axial end faces of the flange 30 are both provided with circular protrusions 31, and one end of each rib 32 is an inclined plane. The rest is the same as the implementation one. Two terminal surfaces all set up circular arch 31, improve the axial pre-compaction, require to improve with the part material of two terminal surface contacts.

To sum up, the utility model provides a pair of powder metallurgy internal gear structure can effectively prevent to install the rotation of back part circumferencial direction, effectively increases the axial pre-compaction and prevents the transmission, long service life, and it is convenient to make, is fit for batch production, and the composition is even, and intensity is high.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description in any form, and although the present invention has been disclosed with reference to the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make modifications or changes equivalent to the equivalent embodiment of the above embodiments without departing from the scope of the present invention.

Claims (9)

1. A powder metallurgy internal gear structure, comprising:

a ring body;

the inner teeth are integrally formed on the inner ring surface of the ring body to form a complete circle;

the flange the outer ring face of ring body is personally submitted 120 jiaos array shaping and has threely, the flange with the axial terminal surface of ring body parallel and level is equipped with circular arch, the surface of flange is close to circular arch is equipped with the axial setting, convex rib, the rib is kept away from circular bellied one end is axial extension's inclined plane, the ring body the internal tooth the flange circular arch with the rib is formed by powder metallurgy integrated into one piece.

2. The powder metallurgy internal gear structure according to claim 1, wherein the internal teeth are involute tooth profiles.

3. The powder metallurgy internal gear structure according to claim 1, wherein the outer edges of the ribs are rounded.

4. An internal gear structure according to claim 1, wherein the flange is flush with the axial end face of the ring body at one end and in the outer ring face at the other end.

5. The internal gear structure for powder metallurgy according to claim 1, wherein two ends of the flanges are flush with axial end faces of the ring body, and the circular protrusions are arranged on end faces of the three flanges on the same face.

6. The powder metallurgy internal gear structure according to claim 1, wherein the number of teeth of the internal teeth is fifty-four.

7. The powder metallurgy internal gear structure according to claim 1, wherein the ratio between the height of the internal teeth and the thickness of the ring body is 0.75-0.85.

8. The powder metallurgy internal gear structure according to claim 1, wherein the axial length of the flange is 0.8 to 0.92 of the width of the ring body.

9. A powder metallurgy internal gear structure according to claim 1, wherein the length of the ribs is 0.4 to 0.5 of the axial length of the flange.

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