A powder metallurgy gear densification device

Abstract

This utility model relates to the field of powder metallurgy parking gear manufacturing technology, and particularly to a powder metallurgy gear densification device, comprising a middle mold, a mandrel, a lower pressing mold, and a support mold. The middle mold has an inner wall diameter that decreases progressively from top to bottom to accommodate the gear, thereby forming multiple levels of mold cavities. The mandrel is inserted into the central hole of the gear. The lower pressing mold is positioned above the gear for pressing it down. The support mold is positioned below the gear for supporting it. This utility model achieves densification of the external spline area through graded densification using the middle mold, resulting in a good densification effect.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy parking gear manufacturing technology, and in particular to a powder metallurgy gear densification device. Background Technology

[0002] The parking gear (ratchet) is a key component in the vehicle parking system, playing a crucial role in the parking process. It is used in conjunction with the parking pawl. The parking system needs to meet the vehicle's safety requirements, so the parking gear is required to have high strength.

[0003] Currently, the densification of powder metallurgy gears is achieved by stamping from two directions, with the pressure mainly directed up and down. This method is not effective for densifying the outer edges of the gears. Utility Model Content

[0004] To address the problem of poor densification effect on the outer edge of gears in existing technologies, this invention provides a powder metallurgy gear densification device that achieves good densification effect on the outer edge of gears.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A powder metallurgy gear densification device, comprising:

[0007] The intermediate mold has an inner wall diameter that decreases in stages from top to bottom to accommodate the gear, thereby forming a multi-stage mold cavity.

[0008] A mandrel, wherein the mandrel is inserted into the center hole of the gear;

[0009] A lower pressure mold is disposed above the gear and is used to press down the gear;

[0010] A support mold is disposed below the gear and is used to support the gear.

[0011] Furthermore, the inner diameter of the intermediate mold decreases in stages, with each stage's inner diameter edge transitioning through a graded inclined surface.

[0012] Furthermore, the inner diameter of the intermediate mold ranges from 2 to 4.

[0013] Furthermore, the number of stages is 3, the diameter difference between the first and second stages is 0.04 to 0.08 mm, and the diameter difference between the second and third stages is 0.02 to 0.04 mm.

[0014] Furthermore, the angle between the first and second graded inclined planes and the straight direction is less than 30°.

[0015] Furthermore, the angle between the second and third graded inclined planes and the vertical direction is less than 15°.

[0016] Furthermore, the gap between the mandrel and the gear is in the range of 0.01 to 0.03 mm.

[0017] Furthermore, the clearance between the primary mold cavity and the gear ranges from -0.01 to -0.08 mm.

[0018] Beneficial effects: This utility model achieves good densification by using a middle mold for graded densification during the densification process, thus completing the densification of the outer spline region. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional schematic diagram of the middle mold of the powder metallurgy gear densification device of this utility model.

[0021] Figure 2 This is a schematic diagram illustrating the working principle of the powder metallurgy gear densification device of this utility model.

[0022] 1. Middle mold; 11. Primary mold cavity; 12. Secondary mold cavity; 13. Tertiary mold cavity; 2. Gear; 3. Mandrel; a. Angle between the first and second grade grading inclined planes and the vertical direction; b. Angle between the second and third grade grading inclined planes and the vertical direction; 4. Lower pressing mold; 5. Support mold. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0026] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0027] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0028] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0029] like Figures 1-2 This invention relates to a powder metallurgy gear densification device, comprising a middle mold 1, a mandrel 3, a lower pressing mold 4, and a support mold 5. The middle mold 1 has an inner wall diameter that decreases from top to bottom to accommodate the gear 2, thereby forming a multi-level mold cavity. The mandrel 3 is inserted into the central hole of the gear 2. The lower pressing mold 4 is disposed above the gear 2 for pressing down the gear 2. The support mold 5 is disposed below the gear 2 for supporting the gear 2.

[0030] The inner diameter of the middle mold 1 decreases in stages, and the edge of each stage of the inner diameter transitions through a graded inclined surface.

[0031] The inner diameter of the middle mold 1 has 2 to 4 levels. In one embodiment of this utility model, the number of levels is 3, the diameter difference between the first and second levels is 0.04 to 0.08 mm, and the diameter difference between the second and third levels is 0.02 to 0.04 mm.

[0032] The angle α between the first and second level grading slopes and the vertical direction is less than 30°. The angle b between the second and third level grading slopes and the vertical direction is less than 15°.

[0033] The gap between the mandrel 3 and the gear 2 is 0.01 to 0.03 mm. The gap between the primary mold cavity 11 and the gear 2 is -0.01 to -0.08 mm.

[0034] In this invention, during densification, the lower die 4 presses down, the support die 5 mainly provides support, and the densification of the outer spline area is completed through the middle die for hierarchical densification.

[0035] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A powder metallurgy gear densification device, characterized in that: include: The middle mold (1) has an inner wall diameter that decreases from top to bottom to accommodate the gear (2), thereby forming a multi-level mold cavity. The mandrel (3) is inserted into the center hole of the gear (2); The lower pressure mold (4) is disposed above the gear (2) and is used to press down the gear (2); The support mold (5) is located below the gear (2) and is used to support the gear (2).

2. The powder metallurgy gear densification device according to claim 1, characterized in that: The inner diameter of the intermediate mold (1) decreases in stages, and the edge of each inner diameter stage is transitioned by a graded inclined surface.

3. The powder metallurgy gear densification device according to claim 1, characterized in that: The inner diameter of the middle mold (1) is in the range of 2 to 4.

4. The powder metallurgy gear densification device according to claim 3, characterized in that: The number of stages is 3, the diameter difference between the first and second stages is 0.04 to 0.08 mm, and the diameter difference between the second and third stages is 0.02 to 0.04 mm.

5. The powder metallurgy gear densification device according to claim 4, characterized in that: The angle (a) between the first and second graded inclined planes and the vertical direction is less than 30°.

6. The powder metallurgy gear densification device according to claim 4, characterized in that: The angle (b) between the second and third graded inclined planes and the vertical direction is less than 15°.

7. The powder metallurgy gear densification device according to claim 1, characterized in that: The gap between the mandrel (3) and the gear (2) is in the range of 0.01 to 0.03 mm.

8. The powder metallurgy gear densification device according to claim 1, characterized in that: The gap between the primary mold cavity (11) and the gear (2) is -0.01 to -0.08 mm.

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