CN115126791A - Lightweight cross axle - Google Patents

Abstract

The invention relates to the field of vehicle parts, in particular to a light-weight cross shaft, which comprises: the cross axle body, location boss and axle journal, the cross axle body includes the body terminal surface, the body side, body outer inclined plane and body internal inclined plane, the location boss includes location portion and location lateral plane, the location boss, axle journal circumference evenly arranges in the body side, body outer inclined plane and body terminal surface, body side junction rounding off, body outer inclined plane and body internal inclined plane incline opposite direction, the location boss is oval and its major axis endpoint is higher than the body terminal surface, the inboard bottom in location portion extends to body inclined plane and body terminal surface junction, location portion outside bottom extends to body inclined plane and body terminal surface junction. Therefore, the problems of low positioning precision, poor positioning stability and large overall weight of the cross shaft are solved.

Description

Lightweight cross axle

Technical Field

The invention relates to the field of vehicle parts, in particular to a light-weight cross shaft.

Background

The cross shaft, also known as a cross joint, is a part for realizing variable-angle power transmission, is used for needing to change the position of the transmission axis direction, is a joint part of a universal transmission device of an automobile driving system, is one of key parts of the universal joint, is provided with four middle transmission elements with radially and uniformly distributed journals in the same plane, is provided with bearings at four ends to reduce resistance, is respectively arranged in fork ports of two fork joints in pairs, is easy to break because the cross shaft usually bears the driving force for driving wheels, and has higher requirements on the processing quality of the cross shaft.

The conventional cross shaft is not provided with a clamping positioning part, self-positioning clamping can not be realized during turning, a center hole needs to be drilled in the shaft end face, the end face center hole is used as a positioning reference to complete subsequent process machining, however, a product machined according to the positioning reference can lead to a subsequent product design reference, the process reference and a detection reference are not unified, the form and position tolerance precision of the machined product is not enough, the product design requirement can not be met, the process route of the product is elongated, the production efficiency is reduced, the utilization rate of raw materials is low, the weight can be increased by directly arranging a protruding face on the end face of the cross shaft, the positioning protruding face is smaller, the positioning protruding face is not matched with a positioning block, the positioning is not firm, and the problems that the cross shaft machining effect is poor, the qualified rate is low and the like are caused.

Disclosure of Invention

The invention provides a light-weight cross shaft convenient to machine and position, and aims to solve the problems of low positioning precision, poor positioning stability and large overall weight of the cross shaft.

In a first aspect, the present invention provides a lightweight cross comprising: the positioning boss is an oval shape and comprises positioning portions which are symmetrically arranged, and the positioning portions are located on a cambered surface between a long axis end point and a short axis end point of the positioning boss.

In some embodiments, the cross shaft body includes a body end surface, a body side surface, an outer body inclined surface and an inner body inclined surface, the positioning boss further includes a positioning side plane, the outer body inclined surface is in smooth transition with the body end surface and the body side surface at the joint, the outer body inclined surface is opposite to the inner body inclined surface in inclination direction, the inner side bottom end of the positioning portion extends to the joint of the outer body inclined surface and the body end surface, and the outer side bottom end of the positioning portion extends to the joint of the outer body inclined surface and the body side surface.

In some embodiments, the central axis of the locating boss coincides with the central axis of the journal.

In some embodiments, the width of the positioning portion is 3-5 mm.

In some embodiments, the body end face and the body outer inclined face are both planes, and an included angle between the body end face and the body outer inclined face is 30-60 degrees.

In some embodiments, the body side surface and the body inner inclined surface are both planes, and an included angle between an extension line of the body side surface and an extension line of the body inner inclined surface is 15-45 degrees.

In some embodiments, the body inner chamfer depth does not exceed 1/3 of the cross-shaft body.

In some embodiments, the top end of the positioning boss is provided as a plane or an inner concave surface.

In some embodiments, the distance from the apex of the locating boss to the end face of the body is 3-7 mm.

In a second aspect, the invention provides a method for machining a lightweight cross shaft, comprising the following steps:

s1, mounting the positioning block and the pressure lever on the indexing chuck;

s2, placing the lightweight cross shaft on the positioning block, and realizing positioning by contacting the positioning part with the V-shaped groove on the positioning block;

s3, descending the pressure rod to press the light-weight cross shaft;

s4, the index chuck drives the positioning block and the pressure lever to rotate at a high speed, and further drives the lightweight cross shaft to rotate at a high speed;

s5, processing the excircle and blind hole of one shaft neck of the light-weight cross shaft by using a turning tool;

s6, when the journal is machined, the indexing device of the indexing chuck drives the light-weight cross shaft to automatically rotate by 90 degrees, and the next journal is machined continuously;

and S7, after the shaft necks of the light weight universal joint pin are all machined, the pressure rod is lifted, and the machining of the light weight universal joint pin is completed.

In order to solve the problems of low positioning precision, poor positioning stability and large overall weight of the cross shaft, the invention has the following beneficial effects:

the cross axle of the invention can realize double-sided positioning by arranging the oval positioning lug boss and arranging the focal point of the long shaft of the oval positioning lug boss to be higher than the end face of the cross axle body, thereby ensuring accurate positioning in the turning process, simultaneously, the outer inclined planes of the cross axle body are processed on the upper side and the lower side of the side face of the cross axle body, the weight of the cross axle is reduced while the strength of the cross axle is ensured, and the effect of light weight is achieved, furthermore, the inner bottom end of the positioning part of the positioning lug boss can extend to the joint of the outer inclined planes of the cross axle body and the end face of the cross axle body, the outer bottom end of the positioning part extends to the joint of the outer inclined planes of the cross axle body and the side face of the cross axle body, the structure increases the positioning contact area of the positioning lug boss and the positioning block, thereby ensuring that the cross axle is more stable in the turning process, improving the turning qualification rate of the cross axle, and finally, taking the plane where the cross axle neck cross axes of the cross axle are positioned as a reference plane, the inner inclined planes of the cross shaft body are arranged in the center of the cross shaft body in an up-and-down symmetrical mode, the weight of the cross shaft is further reduced under the condition that the original strength is guaranteed, the clamping and positioning precision and the clamping and positioning stability of the cross shaft are comprehensively improved through the above modes, the weight of the cross shaft is reduced, and the turning quality of the cross shaft is improved.

Drawings

FIG. 1 shows a schematic view of a lightweight cross shaft according to the present invention;

FIG. 2 shows a top view of the lightweight cross of the present invention;

FIG. 3 is a schematic view of the positioning boss of the lightweight spider of the present invention;

FIG. 4 shows a cross-sectional view of a cross body of the lightweight cross of the present invention;

FIG. 5 shows a schematic view of another lightweight cross of the present invention;

FIG. 6 is a schematic view of the positioning boss of another lightweight spider of the present invention;

FIG. 7 shows a schematic view of another lightweight cross of the present invention;

FIG. 8 is a schematic view of another lightweight spider positioning boss of the present invention;

FIG. 9 shows a schematic structural view of a locating block of the present invention;

FIG. 10 is a schematic view of the positioning of the lightweight cross shaft and the positioning block of the present invention;

FIG. 11 is a flow chart illustrating a method of manufacturing a lightweight spider according to the present invention.

10 a cross shaft body;

101 a body end face;

102 a side surface of the body;

103 a body outer inclined plane;

104 cross-axis center;

105 a body inner inclined plane;

20, positioning a boss;

201 a positioning part;

202 positioning a side plane;

30 journal;

40, positioning blocks;

401V-shaped groove.

Detailed Description

The disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those of ordinary skill in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the present disclosure.

As used herein, the term "include" and its variants are to be read as open-ended terms meaning "including, but not limited to. The term "based on" is to be read as "based, at least in part, on". The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment". The term "another embodiment" is to be read as "at least one other embodiment".

The cross axle is a machine part for realizing variable-angle power transmission and is used for changing the position of a transmission axis direction, the cross axle is provided with four middle transmission elements with journals distributed radially and uniformly in the same plane, four ends are provided with bearings for reducing resistance, every two cross axles are respectively arranged in the fork mouths of two fork joints, the cross axle is easy to break because the cross axle always bears the driving force for driving wheels, and has higher requirements on the processing quality of the cross axle, the existing cross axle is not provided with a clamping and positioning part and can not realize self-positioning clamping during vehicle processing, a central hole needs to be drilled on the end face of the axle, and the central hole on the end face is used as a positioning reference to complete subsequent processing, however, products processed according to the positioning reference cause that the design reference, the process reference and the detection reference of subsequent products are not uniform, the form and position tolerance precision of the processed products is not enough, and the design requirements of the products can not be met, the technical route of the product is lengthened, the production efficiency is reduced, the utilization rate of raw materials is low, the weight is increased due to the fact that the convex surface is directly arranged on the end face of the cross shaft, the requirement for light weight is hard to meet, the problem that the positioning convex surface on the end face of the cross shaft is not matched with the positioning block due to the fact that the positioning convex surface is arranged to be small for meeting the requirement for light weight is solved, the contact area between the positioning convex surface and the positioning block is small, positioning is not firm, and the problem that the processing qualified rate of the cross shaft is low is caused.

To solve the above problem, the present embodiment discloses a lightweight cross shaft convenient for turning and positioning, as shown in fig. 1 to 3, which may include: a spider body 10, a locating boss 20, and a journal 30, the locating boss 20 may be disposed between the spider body 10 and the journal 30, the positioning boss 20 may be oval, the positioning boss 20 may include symmetrically arranged positioning portions, the positioning part is positioned on the cambered surface between the end point of the long axis and the end point of the short axis of the positioning boss 20, the cross axle body 10 comprises a body end surface 101, a body side surface 102, a body outer inclined surface 103 and a body inner inclined surface 105, the positioning boss 20 further includes a positioning side plane 202, the junction of the outer inclined plane 103 of the body, the end face 101 of the body and the side face 102 of the body is in smooth transition, the inclination directions of the body outer inclined plane 103 and the body inner inclined plane 105 are opposite, the bottom end of the inner side of the positioning part extends to the joint of the body outer inclined plane 103 and the body end surface 101, the bottom end of the outer side of the positioning portion extends to the joint of the outer inclined plane 103 of the body and the side surface 102 of the body.

The outer inclined plane 103 and the inner inclined plane 105 of the cross shaft body 10 are arranged to further achieve the effect of reducing the weight of the cross shaft on the basis of meeting the working strength of the cross shaft, under different working conditions of the cross shaft, for example, under some working conditions, higher requirements are provided for the working strength of the cross shaft, but the overall size of the cross shaft is not changed at the same time, at the moment, the outer inclined plane 103 or the inner inclined plane 105 of the cross shaft body 10 can be arranged to be a straight surface to improve the strength of the cross shaft, the length of the inner inclined plane 105 of the cross shaft body in the vertical direction can be larger than or equal to the length of the inner inclined plane 105 of the cross shaft body in the vertical direction, the outer inclined plane 103 of the cross shaft body 10 can be arranged to reduce the weight on one hand, the effect of reducing the weight is achieved, on the other hand, the outer inclined plane 103 of the cross shaft body 10 can also provide more positioning spaces for the positioning bosses 20, namely, the bottom end of the inner side of the positioning portion 201 extends to the joint of the inner inclined plane 105 and the end surface 101 of the cross shaft body, the bottom end of the outer side of the positioning part 201 extends to the joint of the outer inclined plane 103 of the body and the end face 101 of the body, compared with the positioning boss 20 directly arranged on the end face of the cross shaft, the positioning boss 20 of the invention increases the distance of the outer inclined plane 103 of the body in the vertical direction, so that the contact area between the positioning part 201 and the positioning block 40 of the invention is increased. As shown in fig. 5-6, the positioning boss 20 may also be circular, and for the case of low requirement for light weight, the time for processing the circular boss is shorter than that for processing the elliptical boss, so that the production efficiency can be improved, and different requirements can be met.

In the embodiment, the oval positioning boss 20 is arranged, the focal point of the long axis of the oval positioning boss is higher than the body end face 101, so that the cross shaft can realize double-sided positioning, the positioning accuracy in the turning process is ensured, meanwhile, the outer inclined planes 103 of the body are processed on the upper side and the lower side of the side face of the cross shaft body 10, the weight of the cross shaft is reduced while the strength of the cross shaft is ensured, the effect of light weight is achieved, the forging is easier, in addition, the arrangement of the outer inclined planes 103 of the body can ensure that the bottom end of the inner side of the positioning part 201 of the positioning boss 20 extends to the joint of the outer inclined planes 103 of the body and the body end face 101, the bottom end of the outer side of the positioning part 201 extends to the joint of the inclined planes of the body and the body end face 101, the positioning boss 20 and the positioning part 201 of the positioning block 40 are added, the cross shaft is more stable in the turning process, and the qualification rate of the turning process of the cross shaft is improved, finally, the plane where the cross axes of the four shaft necks 30 of the cross shaft are located is used as a reference surface, the inner inclined planes 105 of the body are arranged in the center 104 of the cross shaft in an up-and-down symmetrical mode, the weight of the cross shaft is further reduced under the condition that the original strength is guaranteed, meanwhile, the forging is easier, the clamping and positioning accuracy of the cross shaft is comprehensively improved through the mode, and the turning quality of the cross shaft is improved.

In some embodiments, the central axis of the locating boss 20 coincides with the central axis of the journal 30; the central axis of the oval or circular positioning boss 20 may also be not coincident with the central axis of the journal 30, for example, the oval or circular positioning boss 20 may be disposed between adjacent journals 30, and the included angle between the adjacent journals 30 is 90 degrees, and to ensure the balance of the cross shaft, the oval or circular positioning boss 20 may be disposed at 45 degrees between the adjacent journals 30. In the present embodiment, the center axis of the positioning boss 20 coincides with the center axis of the journal 30, so that the forging process is convenient and the balance is high.

In some embodiments, the width of the positioning portion 201 is 3-5 mm; in the embodiment, the width of the positioning portion 201, that is, the thickness of the positioning boss 20, when the central axis of the positioning boss 20 coincides with the central axis of the journal 30, the positioning boss 20 connects the journal 30 and the cross shaft body 10, and there is a high requirement for the strength thereof, the width of the positioning portion 201 has an important influence on the strength of the positioning boss 20, but the too wide width of the positioning portion 201 also affects the light-weight effect of the cross shaft, and the setting of the width of the positioning portion 201 to 3-5 is based on the application condition of the cross shaft, so that the maximum light-weight effect is realized on the basis of meeting the strength of the cross shaft.

In some embodiments, as shown in fig. 4, the body end surface 101 and the body outer inclined surface 103 are both planar, and an included angle b between the body end surface 101 and the body outer inclined surface 103 is 30-60 °; the outer inclined plane 103 of the cross shaft can also be set as a convex curved surface, in the embodiment, the inclination degree and curvature of the outer inclined plane 103 of the body influence the light weight and the positioning effect of the whole cross shaft, because the outer inclined plane 103 of the body can enable the bottom end of the inner side of the positioning part 201 of the positioning boss 20 to extend to the joint of the outer inclined plane 103 of the body and the end surface 101 of the body, and the bottom end of the outer side of the positioning part 201 extends to the joint of the inclined plane 101 of the body and the end surface 101 of the body, the structure increases the area of the positioning part 201 of the positioning boss 20 and the positioning block 40, the cross shaft is more stable in the turning process, and the outer inclined plane 103 of the body is directly and smoothly connected with the end surface 101 of the body and the side surface 102 of the body, more metal materials can be saved, the weight is reduced, but the cross shaft is in a high-strength working environment, the strength of the cross shaft should meet the requirements, and the strength of the cross shaft can be ensured by setting the included angle between the end surface 101 of the outer inclined plane 103 of the body and the outer inclined plane 103 of the body to be 30-60 degrees, but also can improve the lightweight and positioning effect.

In some embodiments, as shown in fig. 4, the body side surface 102 and the body inner inclined surface 105 are both flat surfaces, and an included angle a between the body side surface 102 and an extension line of the body inner inclined surface 105 is 15-45 °; this internal inclined plane 105 degree of depth is no longer than 1/3 of cross body 10, this internal inclined plane 105 also can set up to the evagination curved surface, in this embodiment, the holistic lightweight effect of cross is influenced to the degree of inclination and the curvature of body outer inclined plane 103, and set up this internal inclined plane 105 for the direct smooth and sly transitional coupling's of cross center 104 side and body terminal surface 101 face mode, can save more metal material, weight reduction, but the cross is in the operational environment of high strength, cross self intensity should satisfy the requirement, be 15~45 with the contained angle of body terminal surface 101 and this internal inclined plane 105 and can promote lightweight effect, easy forging simultaneously.

In some embodiments, as shown in fig. 7-8, the top end of the positioning boss 20 is provided as a flat or concave surface; in this embodiment, the positioning portion 201 of the oval positioning boss 20 is not in complete contact with the inclined plane of the positioning block V-shaped groove 401, the portion above the contact tangent point cannot perform the positioning function, and the portion of the oval positioning boss 20 can be completely or partially cut off, so that the positioning function is met, the weight is reduced, the strength also meets the working requirement, and the structural shape is favorable for forging and prolongs the service life of a forging die.

In some embodiments, the distance from the apex of the locating boss 20 to the body end face 101 is 3-7 mm. In this embodiment, the distance from the vertex of the positioning boss 20 to the end surface 101 of the body is too short, so that the positioning effect is not obvious, the distance from the vertex of the positioning boss 20 to the end surface 101 of the body is too long, so that the weight of the cross shaft is increased, the distance from the vertex of the positioning boss 20 to the end surface 101 of the body is 3-7mm, the processing and positioning of the cross shaft can be stable, and the weight is reduced to the maximum.

In some embodiments, as shown in fig. 9, a positioning block 40 is included to be positioned in cooperation with the lightweight universal joint pin of the present invention, which is convenient for machining and positioning, the positioning block 40 includes a positioning base, 4V-shaped grooves 401 are distributed on the positioning base, four positioning bosses 20 on the lightweight universal joint pin are positioned in cooperation with the 4V-shaped grooves 401 of the positioning block 40, as shown in fig. 10, the lightweight universal joint pin is positioned by contacting the positioning portions 201 of the positioning bosses 20 with V-shaped inclined surfaces on the positioning block 40.

The turning process of the light-weight cross shaft convenient for turning and positioning comprises a positioning process and a machining process, and the specific processes are as follows: and (3) positioning: the positioning block 40 and the pressure lever are arranged on the indexing chuck, the lightweight cross axle with the positioning boss 20 is firstly placed on the positioning block 40, the positioning boss 20 on the cross axle corresponds to the V-shaped positioning groove on the positioning block 40, the positioning boss 20 on the cross axle is vertically symmetrical, the positive and negative directions do not need to be distinguished, the positioning is realized by the contact of the positioning part 201 of the positioning boss 20 and the V-shaped inclined plane on the positioning block 40, and the pressure lever descends to press the cross axle tightly; the processing process comprises the following steps: the indexing chuck drives locating piece 40 and the high-speed rotation of depression bar, and then drives the high-speed rotation of cross axle, the processing of one of them axle journal 30 excircle and blind hole is accomplished to the lathe tool, after this axle journal 30 processing is accomplished, the indexing means of indexing chuck drives cross axle automatic rotation 90 degrees, accomplish the processing of next axle journal 30, after the whole processing of four axle journals 30 of cross axle is accomplished, the depression bar rises, cross axle lathe work is finished, take out the cross axle, in whole course of working, the cross axle keeps high-speed rotation always, it is very high to need its clamping positioning accuracy and depression bar and the centre gripping of locating piece 40 to the cross axle are stable.

Based on the same public conception, the embodiment also discloses a universal joint, and the lightweight universal joint comprises the lightweight cross shaft convenient for turning and positioning. The cross shaft is a machine part for realizing variable-angle power transmission, is used for changing the position of a transmission axis direction, is a joint part of a universal transmission device of an automobile driving system, is a key part of a universal joint, and generally consists of two universal joint forks, a cross shaft connected with the universal joint forks, a needle bearing, an axial positioning piece of the needle bearing, an oil seal and the like. The spider journal 30 is mounted in a bore of the yoke by mating with a needle bearing. In order to prevent the axial movement of the needle bearing, a bearing axial positioning measure is adopted when the structural scheme is designed. The universal joint of the cross shaft type has the advantages of simple structure and high transmission efficiency, the cross shaft of the invention can realize double-sided positioning by arranging the oval positioning lug boss 20, and the focal point of the long shaft of the oval positioning lug boss is higher than that of the body end surface 101, so that the positioning accuracy in the turning process is ensured, meanwhile, the outer inclined surfaces 103 of the body are processed on the upper side and the lower side of the side surface of the cross shaft body 10, the strength of the cross shaft is ensured, the weight of the cross shaft is reduced, the light weight effect is achieved, in addition, the arrangement of the outer inclined surfaces 103 of the body can ensure that the bottom end of the inner side of the positioning part 201 of the positioning lug boss 20 extends to the connecting part of the outer inclined surface 103 of the body and the body end surface 101, the bottom end of the outer side of the positioning part 201 extends to the connecting part of the inclined surface of the body and the body end surface 101, the structure increases the positioning area of the positioning lug boss 20 and the positioning block 40, so that the cross shaft is more stable in the turning process, the yield of the cross axle turning is improved, finally, the planes of the cross axes of the four shaft necks 30 of the cross axle are used as reference surfaces, the inner inclined surfaces 105 of the body are symmetrically arranged on the upper part and the lower part of the center 104 of the cross axle, the weight of the cross axle is further reduced under the condition of ensuring the original strength, the clamping and positioning precision of the cross axle is comprehensively improved through the above mode, and the turning quality of the cross axle is improved, so that the product quality and the product yield of the universal joint using the light-weight cross axle are also ensured, and meanwhile, the light-weight cross axle turning has a better effect.

Based on the same disclosure concept, the embodiment also discloses a method for processing the cross shaft, and S1, a positioning block and a pressure rod are arranged on the indexing chuck; s2, placing the lightweight cross shaft on the positioning block, and realizing positioning by contacting the positioning part with the V-shaped groove on the positioning block; s3, descending the pressure lever to tightly press the light-weight cross shaft; s4, the index chuck drives the positioning block and the pressure lever to rotate at a high speed, and further drives the lightweight cross shaft to rotate at a high speed; s5, processing the excircle and blind holes of one shaft neck 30 of the light-weight cross shaft by using a turning tool; s6, when the journal 30 is machined, the indexing device of the indexing chuck drives the light-weight cross shaft to automatically rotate by 90 degrees, and the next journal 30 is machined continuously; and S7, after the shaft neck 30 of the light weight cross shaft is completely processed, the pressure rod is lifted, and the light weight cross shaft is processed. The lightweight cross shaft is high in positioning accuracy and positioning stability, and machining efficiency and machining quality can be improved.

It is understood that "a plurality" in this disclosure means two or more, and other words are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like, are used to describe various information and should not be limited by these terms. These terms are only used to distinguish one type of information from another, and do not indicate a particular order or degree of importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It will be further understood that the terms "central," "longitudinal," "lateral," "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present embodiment and to simplify the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation.

It is further understood that, unless otherwise specified, "connected" includes direct connections between the two without other elements, indirect connections between the two with other elements, and communication connections that have no physical connection but are capable of information or data transfer.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A lightweight cross, comprising: the positioning boss is an oval shape and comprises positioning portions which are symmetrically arranged, and the positioning portions are cambered surfaces between the long axis end points and the short axis end points of the positioning bosses.

2. The light-weight cross as claimed in claim 1, wherein the cross body comprises a body end surface, a body side surface, a body outer bevel and a body inner bevel, the positioning boss further comprises a positioning side plane, the body outer bevel is smoothly connected with the body end surface and the body side surface, the body outer bevel is opposite to the body inner bevel in inclination direction, the inner bottom end of the positioning portion extends to the connection of the body outer bevel and the body end surface, and the outer bottom end of the positioning portion extends to the connection of the body outer bevel and the body side surface.

3. The light weight cross of claim 1, wherein the central axis of the locating boss coincides with the central axis of the journal.

4. The lightweight cross of claim 3, wherein the width of the locating portion is 3-5 mm.

5. The light-weight cross shaft as claimed in claim 4, wherein the body end surface and the body outer inclined surface are both planar, and the included angle between the body end surface and the body outer inclined surface is 30-60 °.

6. The lightweight cross shaft according to claim 4, wherein the body side surface and the body inner oblique surface are both flat surfaces, and an angle between an extension line of the body side surface and an extension line of the body inner oblique surface is 15 to 45 °.

7. The light weight cross of claim 6, wherein the body inner chamfer depth does not exceed 1/3 of the cross body.

8. The light-weight cross of claim 1, wherein the tips of the positioning bosses are provided as flat or concave surfaces.

9. The light weight cross of claim 4, wherein the distance from the apex of the locating boss to the body end face is 3-7 mm.

10. A method of machining a lightweight cross as set forth in any one of claims 1 to 9, comprising the steps of:

s1, mounting the positioning block and the pressure lever on the indexing chuck;

s2, placing the lightweight cross shaft on the positioning block, and realizing positioning by contacting the positioning part with the V-shaped groove on the positioning block;

s3, descending the pressure rod to press the light-weight cross shaft;

s4, the index chuck drives the positioning block and the pressure lever to rotate at a high speed, and further drives the lightweight cross shaft to rotate at a high speed;

s5, processing the excircle and blind hole of one shaft neck of the light-weight cross shaft by using a turning tool;

s6, when the journal is machined, the indexing device of the indexing chuck drives the light-weight cross shaft to automatically rotate by 90 degrees, and the next journal is machined continuously;

and S7, after the shaft necks of the light weight universal joint pin are all machined, the pressure rod is lifted, and the machining of the light weight universal joint pin is completed.

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