阅读说明：本技术 一种自动变速器离合器齿毂用成型芯轴 (Forming mandrel for automatic transmission clutch gear hub ) 是由 卢知渊 闫江 杜劭峰 赵文军 王卓 张建强 潘树民 李易 于 2019-10-11 设计创作，主要内容包括：本发明涉及一种自动变速器离合器齿毂用成型芯轴,芯轴外圆带有一定锥度,芯轴初始端直径与离合器齿毂内径保持一致为D,收口端直径为D<Sub>1</Sub>＝D-2δ,δ为在成形加工过程中离合器齿毂零件口部沿直径方向单边的变形量；本发明通过对成形芯轴进行带有一定斜度的的设计,使零件加工时口部由于材料的回弹和应力的释放所增加的尺寸补偿较小芯轴与零件设计尺寸的差值,在加工过程中避免出现上述口部变大的现象,满足产品设计垂直度及使用的要求。(The invention relates to a forming mandrel for a clutch gear hub of an automatic transmission, wherein the excircle of the mandrel is provided with a certain taper, the diameter of the initial end of the mandrel is kept consistent with the inner diameter of the clutch gear hub to be D, and the diameter of the closed end is D 1 D-2 delta, wherein delta is the unilateral deformation of the port of the clutch gear hub part along the diameter direction in the forming process; according to the invention, by designing the forming mandrel with a certain inclination, the size of the opening part increased by the rebound of materials and the release of stress during the part processing compensates the difference value between the smaller mandrel and the designed size of the part, the phenomenon that the opening part is enlarged in the processing process is avoided, and the design verticality and the use requirement of the product are met.)

1. A forming mandrel for a clutch gear hub of an automatic transmission,the method is characterized in that: the excircle of the mandrel has a certain taper, the size from the bottom to the opening part is gradually reduced, the diameter of the initial end of the mandrel is kept consistent with the inner diameter of the clutch gear hub to be D, and the diameter of the terminating end is D₁D-2 delta, wherein delta is the unilateral deformation of the port of the clutch gear hub part along the diameter direction in the forming process; the taper is alpha (arctan) (delta/L); l is the clutch hub height.

2. The forming mandrel for an automatic transmission clutch hub according to claim 1, wherein: δ can be obtained by the difference in diameter between the beginning and ending parts of the part and the material spring back and stress relief.

3. The forming mandrel for an automatic transmission clutch hub according to claim 1, wherein: if the height L of the clutch gear hub is larger than a certain size, the excircle tooth form of the mandrel adopts a multi-section and different-taper structure.

4. The forming mandrel as claimed in claim 3, wherein the forming mandrel comprises: when the excircle tooth form of the mandrel adopts a multi-section and different taper structure, the height of the first taper section of the mandrel is L₁The diameter of the starting end of the clutch gear hub is consistent with the inner diameter of the clutch gear hub and is D according to the unilateral deformation delta of the part in the first section diameter direction in the forming process₁Determining the unilateral deformation of the first section of the spindle in the taper ending end diameter direction as delta₁According to delta₁Determining the first section taper alpha of a mandrel₁＝arctan(δ₁/L₁) The starting end of the second conical section is the ending end of the first conical section, and the unilateral deformation quantity in the diameter direction of the starting end of the second conical section relative to the ending end of the first conical section is delta₂The height of the second cone section is L₂To obtain the taper alpha of the mandrel of the section₂＝arctan(δ₂/L₂) By analogy, the taper of the nth section of the mandrel is alpha_n＝arctan(δ_n/L_n)，δ_nIs as follows_nThe unilateral deformation of the diameter direction of the cone section relative to the ending end of the previous cone section, L_nIs as follows_nOf conical sectionsHeight.

5. The forming mandrel for an automatic transmission clutch hub according to claim 1, wherein: the alpha angle is 0.5-4.5 deg.

6. The forming mandrel as claimed in claim 3, wherein the forming mandrel comprises: when the height L of the clutch gear hub is larger than 100mm, the excircle tooth form of the mandrel adopts a multi-section and different-taper structure.

Technical Field

The invention belongs to the field of automatic transmission clutches, and particularly relates to a forming mandrel for an automatic transmission clutch gear hub.

Background

The inner and outer tooth shapes of the clutch gear hub of the automatic gearbox are manufactured by adopting a rotary extrusion forming method, namely, a cylindrical prefabricated member is sleeved on a mandrel with the tooth shapes, the rotation and the feeding of the mandrel are synchronously carried out, and the prefabricated member is extruded by two pairs of rollers in a rotary manner, so that the prefabricated member is continuously and uniformly processed into the clutch gear hub with the inner and outer tooth shapes. The current design of the rotary extrusion forming mandrel is consistent with the tooth form of the clutch outer hub part, after the part is finished by rotary extrusion, the phenomenon that the opening part is enlarged can occur due to the rebound of materials and the release of stress, so that the diameter size of the opening part of the part is larger than that of the bottom part, the diameters of different heights are different, the verticality is poor, and the design and use requirements cannot be met.

Disclosure of Invention

The invention provides a forming mandrel for a clutch gear hub of an automatic transmission, which aims to solve the technical problems that: the mouth of the part is enlarged due to the rebound of the material and the release of the stress.

In order to solve the technical problem, the invention provides a forming mandrel for a clutch gear hub of an automatic transmission, which is characterized in that: the excircle of the mandrel has a certain taper, the size from the bottom to the opening part is gradually reduced, the diameter of the initial end of the mandrel is kept consistent with the inner diameter of the clutch gear hub to be D, and the diameter of the terminating end is D₁D-2 delta, wherein delta is the unilateral deformation of the port of the clutch gear hub part along the diameter direction in the forming process; the taper is alpha (arctan) (delta/L); l is the clutch hub height.

Has the advantages that: the invention designs the forming mandrel with a certain inclination, and the size of the forming mandrel is gradually reduced from the bottom to the opening, so that the diameter size of a processed part at the opening is smaller, the size of the opening is increased due to the rebound of materials and the release of stress during the processing of the part, the sizes of the diameters of the parts at different heights are consistent due to the size reduction of the mandrel, the problem of poor straightness of the product is solved, and the requirements of the design verticality and the use of the product are met.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a right side view of FIG. 1;

FIG. 3 is a schematic view of one embodiment of the present invention;

fig. 4 is a schematic view of a clutch hub formation.

Detailed Description

In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention is provided.

The invention provides a forming mandrel for an automatic transmission clutch gear hub, wherein the excircle tooth form of the mandrel is provided with a certain taper, the diameter of the initial end of the mandrel is kept consistent with the inner diameter of the clutch gear hub to be D, and the diameter of the terminating end is D1 ═ D-2 delta, namely the diameter of the clutch gear hub-the diameter deformation of a part in the forming process (shown in figure 2); the taper is alpha (arctan) (delta/L);

the diameter of the clutch gear hub is D, the height of the clutch gear hub is L, the unilateral deformation amount in the diameter direction of the opening part of the part in the forming process is delta, and the delta can be obtained through the diameter difference of the starting end and the ending end of the part and the rebound and stress release conditions of materials. The clutch gear hub part is a part processed when the mandrel does not have taper.

If the height L of the clutch gear hub is larger than a certain size (generally 100mm), the sizes of the parts which are rebounded and deformed at different heights are inconsistent, and at the moment, the excircle tooth form of the mandrel adopts a multi-section and different-taper structure. The height of the first conical section of the mandrel is L₁The diameter of the starting end of the clutch gear hub is consistent with the inner diameter of the clutch gear hub and is D according to the unilateral deformation delta of the part in the first section diameter direction in the forming process₁Determining the unilateral deformation of the first section of the spindle in the taper ending end diameter direction as delta₁，

According to delta₁Determining the first section taper alpha of a mandrel₁＝arctan(δ₁/L₁) The starting end of the second conical section is the ending end of the first conical section, and the unilateral deformation quantity in the diameter direction of the starting end of the second conical section relative to the ending end of the first conical section is delta₂The height of the second cone section is L₂To obtain the taper alpha of the mandrel of the section₂＝arctan(δ₂/L₂) By analogy, the taper of the nth section of the mandrel is alpha_n＝arctan(δ_n/L_n)，δ_nIs as follows_nThe unilateral deformation of the diameter direction of the cone section relative to the ending end of the previous cone section, L_nIs as follows_nThe height of the cone segments.

The angle alpha is set to be generally 0.5 to 4.5 deg.

Because the structural design of the inclination offsets with the rebound and stress release of the material, the clutch outer hub product with good straightness is formed.

The technical scheme of the invention is adopted for the rotary extrusion forming mandrel of the outer hub of the high-power AT transmission clutch C2, the diameter of the outer hub of the clutch C2 is D (phi 328.84mm), the height is L (170mm), a certain deformation amount delta (4.5mm) occurs in the diameter direction of the part opening part in the forming process, when the forming mandrel is designed, the diameter of one end of the mandrel is kept consistent with the diameter of the clutch gear hub to be D (phi 328.84mm), and the diameter of the other end of the mandrel is designed to be D₁(D₁D-2 δ 320.84). Thus, the degree of spindle slope can be determined by calculation, as: α ═ arctan (δ/L) ═ arctan (4.5/170) ═ 1.5 ° (see fig. 3).

By adopting the design of the clutch gear hub forming mandrel, the phenomenon that the opening part is enlarged is avoided in the processing process, the resilience and deformation of parts are overcome, and the requirements of product design verticality and use are met (see attached figure 4).

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.