Differential lock half axle gear machining positioning structure

Abstract

The utility model relates to a differential lock half axle gear machining positioning structure which comprises a differential lock half axle gear primary forging piece. The differential lock half axle gear primary forging piece is composed of a large-diameter section, a medium-diameter section and a small-diameter section which are coaxially connected in sequence, a plurality of conical teeth which are evenly distributed in the circumferential direction are arranged on the end face, away from the small-diameter section, of the large-diameter section, and a plurality of end face teeth which are evenly distributed in the circumferential direction are arranged on the end face, facing the small-diameter section, of the large-diameter section. The conical teeth and the end face teeth are different in number, at least one conical tooth corresponds to one end face tooth in position in the circumferential direction, a positioning rib is arranged on the outer circumferential face of the small-diameter section in the circumferential position and corresponds to a protrusion, and the positioning rib extends in the axial direction. The forging die further comprises a warm forging die used for forging the differential lock half axle gear primary forging piece and a cold extrusion die used for extruding the differential lock half axle gear primary forging piece, and the side face of the die cavity is correspondingly provided with a groove used for forming a positioning rib and containing the positioning rib. According to the structure, accurate and rapid positioning during cold extrusion can be facilitated, and quality and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the processing technical field of wheel with tooth in mechanical engineering, and specifically relates to a differential lock half shaft gear machining positioning structure. BACKGROUND

[0002] The differential lock half shaft gear has a large diameter section and a small diameter section, both end faces of the large diameter section are processed with toothed structures, which are respectively helical gears uniformly distributed in the circumferential direction on the end face of the large diameter section away from the small diameter section and end face teeth uniformly distributed in the circumferential direction on the end face of the large diameter section towards the small diameter section, the toothed structures are used for transmitting torque, and the small diameter section is used for mounting and cooperation, and the half shaft gear can be referred to in Chinese patent CN220410290U or the drawings of the present application. When manufactured, the differential lock half shaft gear is subjected to blank warm forging, first cold extrusion forming and second cold extrusion shaping. In the initial forging process of blank warm forging, the rudiment of the small diameter section, the large diameter section, the helical gear on one face and the end face teeth on the back face is forged, then the blank after warm forging is taken out of the warm forging die and placed into the die for first cold extrusion forming, the first cold extrusion forming and the second cold extrusion shaping adopt the same set of cold extrusion dies, after the first cold extrusion forming and the second cold extrusion shaping, the accurate forming of the helical gear on the large diameter section and the end face teeth on the back face is completed, and the toothed structure does not need subsequent mechanical finishing.

[0003] On some differential lock half shaft gears, the number of helical gears and end face teeth in the circumferential direction is different, that is, the angle between adjacent teeth of the helical gear is different from the angle between adjacent teeth of the end face teeth, and the helical gear and the end face teeth do not necessarily correspond to each other in an axial back-to-back manner. When the blank after warm forging is taken out of the warm forging die and placed into the cold extrusion die, it is necessary to determine the circumferential position of the slot shape on the cold extrusion die for extruding the helical gear and the end face teeth, which corresponds to the circumferential position of the helical gear and the end face teeth already forged on the blank.

[0004] From the actual situation, the cold extrusion die includes a lower die and an upper die, the hole position for accommodating the small diameter section and the slot shape for extruding the end face teeth are processed on the upper surface of the lower die of the cold extrusion die, and the slot shape for extruding the helical gear is processed on the lower surface of the upper die of the cold extrusion die. When the blank after warm forging is placed into the cold extrusion die, the small diameter section falls into the hole position of the lower die, and the end face teeth preliminarily fall into the slot shape for extruding the end face teeth, so the positioning of the end face teeth is not a problem, but at this time, if the circumferential position of the slot shape for extruding the helical gear in the upper die does not correspond to the circumferential position of the helical gear on the blank, the helical gear of the blank will be extruded and damaged when the upper die is lowered for extrusion, and even the cold extrusion die will be damaged. At present, only manual visual alignment of the circumferential position of the helical gear of the blank and the slot shape for extruding the helical gear of the upper die is adopted to correspondingly adjust the circumferential position of the end face teeth of the rough forging blank falling into the slot shape for extruding the end face teeth, so that the blank helical gear and the upper die are matched, but the fault tolerance is low, and the situation that the blank is damaged or the cold extrusion die is damaged due to inaccurate alignment may easily occur. SUMMARY

[0005] In view of the above problems of the prior art, the technical problem to be solved by the utility model is to provide a differential lock half shaft gear machining positioning structure, to avoid the problem of inconvenient circumferential positioning of the differential lock half shaft gear initial forging piece with unequal numbers of bevel gears and face gears in the cold extrusion die, and to achieve the effects of accurate and rapid positioning and quality improvement and efficiency increase.

[0006] To solve the above technical problem, the utility model adopts the following technical scheme:

[0007] The differential lock half shaft gear machining positioning structure comprises a differential lock half shaft gear initial forging piece; the differential lock half shaft gear initial forging piece is composed of a large-diameter section, a medium-diameter section and a small-diameter section which are coaxial and connected in sequence, a plurality of bevel gears are arranged on the end face of the large-diameter section away from the small-diameter section in a circumferential uniform distribution manner, and a plurality of face gears are arranged on the end face of the large-diameter section facing the small-diameter section in a circumferential uniform distribution manner; the numbers of the bevel gears and the face gears are different, at least one bevel gear and one face gear correspond in position in the circumferential direction, and on the circumferential position, a positioning rib is arranged in a corresponding protrusion manner on the outer circumferential surface of the small-diameter section, and the positioning rib extends axially.

[0008] The above technical scheme is further improved, and the positioning rib extends axially to abut against the end face of the medium-diameter section facing the small-diameter section.

[0009] Further, the axial extension length of the positioning rib is greater than the axial thickness of the face gear.

[0010] Further, the positioning rib protrudes from the outer circumferential surface of the small-diameter section by 1-3 mm.

[0011] Further, the number of the bevel gears is 16, the number of the face gears is 20, and every 90° interval in the circumferential direction, the circumferential positions of one bevel gear and one face gear correspond to each other, and four positioning ribs are arranged in a corresponding protrusion manner on the outer circumferential surface of the small-diameter section.

[0012] Further, the utility model further comprises a warm forging die for forging the differential lock half shaft gear initial forging piece, the upper die of the warm forging die is provided with a first bevel gear groove for forming the bevel gears, the lower die of the warm forging die is provided with a recess cavity for forming the medium-diameter section and the small-diameter section, and the upper surface of the lower die of the warm forging die is further provided with a first face gear groove for forming the face gears; a first recess groove for forming the positioning rib is recessed and arranged on the inner side wall of the recess cavity for forming the small-diameter section.

[0013] Further, a cold extrusion die for extruding the differential lock half axle gear rough casting is further included, an upper die of the cold extrusion die is provided with a second bevel gear slot for extruding the bevel gears, a lower die of the cold extrusion die is provided with a concave cavity for accommodating the medium diameter section and the small diameter section, and an upper surface of the lower die of the cold extrusion die is further provided with a second end face gear slot for extruding the end face gears; a second groove for accommodating the positioning rib is recessed on an inner side wall of the concave cavity for accommodating the small diameter section, and the second groove extends upwardly and penetrates to the concave cavity for accommodating the medium diameter section;

[0014] In each of the second end face gear slots for extruding the end face gears, the circumferential position of at least one end face gear slot corresponds to the circumferential position of the second groove;

[0015] In each of the second bevel gear slots for extruding the bevel gears, the circumferential position of at least one bevel gear slot corresponds to the circumferential position of the second groove.

[0016] Compared with the prior art, the differential lock half axle gear machining positioning structure has the following beneficial effects:

[0017] The differential lock half axle gear machining positioning structure of the utility model, through the warm forging die, the small diameter section, the medium diameter section, the large diameter section, the bevel gear and the end face gear are formed into the rough shape at the same time, the positioning rib is formed on the small diameter section, the circumferential position relationship between the positioning rib and the end face gear and the bevel gear is unique. After the rough casting, the rough casting is taken out from the warm forging die and put into the lower die of the cold extrusion die, the positioning rib must fall into the second groove, through the cooperation between the second groove and the positioning rib, the circumferential positioning of the rough casting in the cold extrusion die is realized, which is accurate and reliable, the circumferential position of the bevel gear slot of the upper die of the cold extrusion die has been matched with the second groove and determined, and the rough casting can be accurately extruded by pressing down, so that accurate and rapid positioning is realized, and quality and efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a front view of the differential lock half axle gear rough casting in the differential lock half axle gear machining positioning structure of the specific embodiment;

[0019] Figure 2 It is Figure 1 It is a top view of the differential lock half axle gear rough casting;

[0020] Figure 3 It is Figure 1 It is a bottom view of the differential lock half axle gear rough casting;

[0021] Figure 4 It is a schematic view of the die of the differential lock half axle gear machining positioning structure of the specific embodiment;

[0022] Wherein, the differential lock half axle gear rough forging 100, the large diameter section 1, the bevel gear 11, the end face tooth 12, the medium diameter section 2, the small diameter section 3, the positioning rib 31, the lower die 200, the concave cavity 4, the first end face tooth groove 5, the first recess 6, the second end face tooth groove 7, the second recess 8. DETAILED DESCRIPTION

[0023] The specific embodiments of the utility model will be further explained in detail below with reference to the drawings.

[0024] Please see Figures 1-4 , the differential lock half axle gear machining positioning structure of specific embodiment, including differential lock half axle gear rough forging 100, the warm forging die for forging the differential lock half axle gear rough forging 100 and the cold extrusion die for extruding the differential lock half axle gear rough forging 100;The differential lock half axle gear rough forging 100 includes coaxial large diameter section 1, medium diameter section 2 and small diameter section 3 connected in sequence, the end face of the large diameter section 1 away from the small diameter section 3 is equipped with the several bevel gears 11 of the uniform distribution in the circumference, and the end face of the large diameter section 1 towards the small diameter section 3 is equipped with the several end face teeth 12 of the uniform distribution in the circumference;The number of bevel gear 11 and end face tooth 12 is not equal, at least one bevel gear 11 and one end face tooth 12 correspond in the position of the circumference (namely, axially back to back, and the tooth center line is all on the same cross section of the axis), and in the position of the circumference, the outer circumferential surface of the small diameter section 3 is correspondingly provided with a positioning rib 31 (the center line of the rib is also on the cross section of the axis) on the protrusion, and the positioning rib 31 extends along the axial direction.

[0025] Please continue to see Figure 1 And Figure 4 The upper die (not shown in the drawing) of the warm forging die has the first bevel gear groove for forming the bevel gear 11, and the lower die 200 of the warm forging die has the concave cavity 4 for forming the medium diameter section 2 and the small diameter section 3, and the upper surface of the lower die 200 of the warm forging die is further provided with the first end face tooth groove 5 for forming the end face tooth 12;The inner side wall of the concave cavity 4 for forming the small diameter section 3 is recessed and provided with the first recess 6 for forming the positioning rib 31.

[0026] The upper die of the cold extrusion die (the appearance is similar to the warm forging die, and please continue to see Figure 4 ) has the second bevel gear groove for extruding the bevel gear 11, and the lower die 200 of the cold extrusion die has the concave cavity 4 for accommodating the medium diameter section 2 and the small diameter section 3, and the upper surface of the lower die of the cold extrusion die is further provided with the second end face tooth groove 7 for extruding the end face tooth 12;The inner side wall of the concave cavity 4 for accommodating the small diameter section 3 is recessed and provided with the second recess 8 for accommodating the positioning rib 31, and the second recess 8 extends upward and penetrates to the concave cavity 4 for accommodating the medium diameter section 2;

[0027] In each of the second end face tooth grooves for extruding the end face teeth 12, the circumferential position of at least one end face tooth groove corresponds to the circumferential position of the second groove 8;

[0028] In each of the second bevel tooth grooves for extruding the bevel teeth 11, the circumferential position of at least one bevel tooth groove corresponds to the circumferential position of the second groove 8.

[0029] The differential lock half shaft gear machining positioning structure of the embodiment forms the positioning rib 31 on the small diameter section 3 while forming the small diameter section 3, the medium diameter section 2, the large diameter section 1, the bevel tooth 11 and the end face tooth 12 into an embryonic form by the warm forging die. The positional relationship of the positioning rib 31 with the end face tooth 12 and the bevel tooth 11 in the circumferential direction is unique. After the initial forging, the positioning rib 31 is taken out from the warm forging die and placed into the lower die of the cold extrusion die. The positioning rib 31 must fall into the second groove 8. Through the cooperation of the second groove 8 and the positioning rib 31, the circumferential positioning of the initial forging in the cold extrusion die is realized, which is accurate and reliable. The circumferential position of the bevel tooth groove of the upper die of the cold extrusion die has been adapted to the second groove 8 and determined. The initial forging can be accurately extruded by the lower die, so as to realize accurate and rapid positioning and improve quality and efficiency.

[0030] During implementation, the number of the bevel teeth 11 and the end face teeth 12 is not equal and is not limited, for example, there can be seven bevel teeth and eight end face teeth, or there can be eight bevel teeth and twelve end face teeth. In some cases, there can be multiple bevel teeth 11 and end face teeth 12 in the axial back-to-back state. The number of the corresponding positioning ribs 31 can be increased.

[0031] The positioning rib 31 extends axially to abut against the end face of the medium diameter section 2 facing the small diameter section 3. In this way, the first groove 6 extends upward and penetrates to the cavity 4 for forming the medium diameter section 2 on the lower die of the warm forging die, facilitating the machining of the first groove 6 and the upward ejection of the initial forging from the die after the initial forging.

[0032] The axial extension length of the positioning rib 31 is greater than the axial thickness of the end face tooth 12. In this way, when the initial forging is placed into the lower die of the cold extrusion die, the positioning rib 31 enters the second groove 8 earlier than the end face tooth 12 falls into the second end face tooth groove 7, which can better guide the positioning.

[0033] Please refer to Figure 1 The positioning rib 31 protrudes 1-3 mm from the outer circumferential surface of the small diameter section 3. The reliability of positioning using the positioning rib 31 can be ensured.

[0034] Please refer to Figure 2 and Figure 3In the embodiment, the number of the bevel gears 11 is sixteen, and the number of the face gears 12 is twenty. In the circumferential direction, every 90°, a bevel gear 11 and a face gear 12 correspond to each other in the circumferential position. Four positioning ribs 31 are arranged on the outer circumferential surface of the small-diameter section 3 corresponding to the protrusions. In this way, the positioning ribs 31 are arranged more to better guarantee the reliability of positioning by the positioning ribs 31.

[0035] In use, after the differential lock half shaft gear rough casting 100 is formed by first cold extrusion and second cold extrusion, the precise forming of the bevel gears 11 on the large-diameter section 1 and the face gears 12 on the back surface thereof is completed, and the tooth structure does not need subsequent mechanical finishing. The positioning ribs 31 are removed by turning during subsequent finishing of the outer circle of the small-diameter section 3.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application. They should be included in the scope of the claims of the present application.

Claims

1. A differential lock half-shaft gear machining and positioning structure, including a differential lock half-shaft gear initial forging; characterized in that: The differential lock half axle gear initial forging is composed of a large diameter section, a medium diameter section and a small diameter section connected in sequence and coaxially, a plurality of bevel gears are arranged on the end face of the large diameter section away from the small diameter section, and a plurality of end face gears are arranged on the end face of the large diameter section towards the small diameter section; the number of the bevel gears and the end face gears is different, at least one bevel gear and one end face gear correspond in the circumferential position, and a positioning rib is arranged on the outer circumferential surface of the small diameter section corresponding to the protrusion in the circumferential position, and the positioning rib extends axially.

2. The differential lock half axle gear machining positioning structure according to claim 1, characterized in that: The positioning rib extends axially to abut against the end face of the medium diameter section towards the small diameter section.

3. The differential lock half axle gear machining positioning structure according to claim 1, characterized in that: The axial extension length of the positioning rib is greater than the axial thickness of the end face gear.

4. The differential lock half shaft gear machining positioning structure according to any one of claims 1-3, characterized in that: The positioning rib protrudes from the outer circumferential surface of the small diameter section by 1-3 mm.

5. The differential lock half shaft gear machining positioning structure according to any one of claims 1-3, characterized in that: The number of the bevel gears is 16, the number of the end face gears is 20, and every 90° interval in the circumferential direction has a circumferential position corresponding to one bevel gear and one end face gear, and four positioning ribs are arranged on the outer circumferential surface of the small diameter section corresponding to the protrusion.

6. The differential lock half axle gear machining positioning structure according to claim 1, characterized in that: The warm forging die for forging the differential lock half axle gear initial forging is also included, the upper die of the warm forging die has a first bevel gear groove for forming the bevel gears, the lower die of the warm forging die has a recess for forming the medium diameter section and the small diameter section, and the upper surface of the lower die of the warm forging die also has a first end face gear groove for forming the end face gears; the inner side wall of the recess for forming the small diameter section is recessed to form a first recess for forming the positioning rib.

7. The differential lock half axle gear machining positioning structure according to claim 6, characterized in that: The cold extrusion die for extruding the differential lock half axle gear initial forging is also included, the upper die of the cold extrusion die has a second bevel gear groove for extruding the bevel gears, the lower die of the cold extrusion die has a recess for accommodating the medium diameter section and the small diameter section, and the upper surface of the lower die of the cold extrusion die also has a second end face gear groove for extruding the end face gears; the inner side wall of the recess for accommodating the small diameter section is recessed to form a second recess for accommodating the positioning rib, and the second recess extends upwardly and penetrates the recess for accommodating the medium diameter section; In each of the second end face gear grooves for extruding the end face gears, at least one end face gear groove corresponds in the circumferential position to the circumferential position of the second recess; In each of the second bevel gear grooves for extruding the bevel gears, at least one bevel gear groove corresponds in the circumferential position to the circumferential position of the second recess.

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