Deep groove type combined tooth cold extrusion machining tooth sheet and die

Abstract

The utility model discloses a deep groove type combined tooth cold extrusion processing tooth piece which comprises a tooth piece body, the upper portion of the front end of the tooth piece body protrudes forwards to form a front protruding portion, the top of the front protruding portion protrudes upwards to form a tooth forming portion, and the front end of the tooth forming portion is provided with a tooth shape used for processing a single tooth shape of a combined tooth. The utility model further discloses a deep groove type combined tooth cold extrusion machining die which comprises an upper die base and a lower die base, a plurality of deep groove type combined tooth cold extrusion machining tooth pieces are distributed on the top face of the lower die base in a horizontal circular array shape, and the front ends of tooth piece bodies face the direction where the center of the array is located. The tooth piece bodies can be connected to the top face of the lower die base in a sliding mode in the radial direction of the circumference where the array of the tooth piece bodies is located, taper sleeves arranged on the outer sides of the tooth piece bodies in a sleeving mode are fixed to the upper die base, and inclined faces matched with each other are arranged in the taper sleeves and at the rear ends of the tooth piece bodies. And all the tooth sheet bodies are synchronously pushed to move inwards by driving the taper sleeve to descend so as to carry out cold extrusion on the structural tooth part.

Description

Technical Field

[0001] The utility model relates to the technical field of gear processing, in particular to a deep groove type combined gear cold extrusion processing gear piece and a die. Background Art

[0002] The transmission coupling teeth are mainly used to produce different kinds of extreme differences in gear shifting transmission. In order to prevent the gear from being disengaged during operation, most modern automobile transmission gears are made into an inverted cone. The manufacturing method of the transmission is to process the tooth body and the coupling gear ring into two parts, and then connect them into one by interference fit. Due to the large number of defects, the overall precision forging method is now mostly used to solve the above-mentioned drawbacks. In the overall precision forging process, a corresponding number of tooth plates are set according to the number of teeth of the coupling teeth. The top protrusion of the tooth plate has a tooth portion for processing a single tooth shape of the coupling teeth. During processing, the coupling teeth are first fixed, and then the tooth portion on the tooth plate is extended into the annular groove on the coupling teeth. By moving the tooth plate along the radial direction of the coupling teeth, the tooth portion is cold extruded on the inner ring of the annular groove, and then the tooth shape of the coupling teeth is processed. However, since the width of the annular groove on the coupling tooth is relatively narrow, the width of the tooth portion on the tooth plate is also relatively narrow. The coupling tooth is subjected to radial force during processing, and the long-term processing stress is concentrated on the root position of the tooth portion, which can easily cause fracture between the tooth portion and the tooth plate. This not only affects the service life of the tooth plate and increases the processing cost of the coupling tooth, but also the frequent replacement of molds affects the production efficiency of the coupling tooth. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a deep groove type combined tooth cold extrusion processing tooth piece which can increase the service life and reduce the processing cost.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A deep groove type cold extrusion processing tooth plate for combining teeth comprises a tooth plate body, the upper front end portion of the tooth plate body protrudes forward to form a front protrusion, the top of the front protrusion protrudes upward to form a tooth forming portion, the front end of the tooth forming portion has a tooth shape for processing a single tooth shape of the combining teeth, and the maximum length of the tooth forming portion along the front and rear directions of the tooth plate body is less than the width of the annular groove on the combining teeth to be processed.

[0006] In the utility model, the tooth forming part is raised on the top of the front convex part. When the tooth forming part performs cold extrusion on the structural teeth, the radial reaction force acts on the tooth forming part. Because the tooth forming part is formed on the front convex part, the structure changes. Therefore, the position of the stress is mostly concentrated on the front convex part. The position and direction of the stress are changed, thereby reducing the impact on the tooth forming part. Combined with the front convex part adopting a forward protruding structure, the structural strength itself can be increased, thereby increasing the service life of the tooth forming part and the entire tooth plate body.

[0007] As an optimization, the tooth forming part is formed by the top of the front protrusion and the top of the tooth plate body protruding upwards, so as to disperse the stress position and further improve the service life of the tooth forming part.

[0008] As an optimization, an upper inclined surface extending obliquely upward from the front convex portion toward the rear thereof to the tooth forming portion is formed between the front convex portion and the tooth forming portion, and a lower inclined surface extending obliquely downward from the front convex portion toward the rear thereof to the front lower portion of the tooth plate body is formed between the front convex portion and the front lower portion of the tooth plate body. The inclined surface can increase the intersection angle between the front convex portion and the tooth forming portion and the front lower portion of the tooth plate body, respectively, and can avoid excessive stress concentration at the intersection angle.

[0009] As an optimization, the upper inclined surface forms an arc intersection angle with the front protrusion and the tooth forming portion, and the lower inclined surface forms an arc intersection angle with the front protrusion and the front lower part of the tooth plate body. At the arc intersection angle, the stress concentration effect is significantly reduced due to the smooth transition of the arc. The stress line gradually changes direction in the arc area instead of turning sharply, thereby reducing stress concentration.

[0010] A deep groove combined tooth cold extrusion processing die comprises an upper die base and a lower die base, and a plurality of deep groove combined tooth cold extrusion processing teeth as described above are distributed in a horizontal circular array on the top surface of the lower die base, and the front end of the tooth plate body faces the direction of the center of its array, and the tooth plate body can be slidably connected to the top surface of the lower die base along the radial direction of the circumference of the array, and a tapered sleeve coaxial with the circumference of the tooth plate body array is also provided on the outer side of all the tooth plate bodies, and the tapered sleeve is fixedly connected to the upper die base, and the contact surfaces between the inner hole of the tapered sleeve and the rear end of each tooth plate body are respectively matched with inclined surfaces, and when the tapered sleeve moves downward, the tapered sleeve can synchronously drive each tooth plate body to move toward the center of the tooth plate body array through the inclined surfaces between each tooth plate body. Place the combined tooth part on the deep groove combined tooth cold extrusion processed tooth piece of the array, the tooth forming part extends into the annular groove on the side of the combined tooth part, and adjust the center position of the combined tooth part, and then the upper die seat drives the tapered sleeve to descend. During the descent of the tapered sleeve, its inner hole cooperates with the inclined surface at the rear end of each tooth piece body, and pushes the tooth piece body inward in the radial direction of the circle formed by the deep groove combined tooth cold extrusion processed tooth piece array, so that the tooth shape on the tooth forming part acts on the annular groove, and then the corresponding tooth shape is cold extruded.

[0011] As an optimization, a rubber body is placed on the top surface of the lower die seat and on the inner side of all the tooth plate bodies. The lower front end of the tooth plate body abuts against the rubber body. When the tooth plate body moves toward the inner side, the tooth plate body can squeeze the rubber body. When the tooth plate body is processing the tooth shape, the lower end of the tooth plate body can abut against the rubber body and squeeze the rubber body inward. After the combined tooth processing is completed and the cone sleeve rises, the rubber body can release the elastic deformation and push the tooth plate body outward in the opposite direction, so as to achieve the effect of resetting the tooth plate body.

[0012] Compared with the prior art, the utility model has the following advantages: the utility model avoids stress concentration at the position between the tooth forming part and the tooth plate body by changing the position and direction of stress, reduces the loss of the tooth forming part, thereby increasing the service life and reducing the processing cost of the combined teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the tooth plate body of the utility model;

[0014] Figure 2 It is a cross-sectional view of the processing state of the mold for the coupling teeth in the utility model. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0016] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] like Figure 1As shown, the deep groove type combining tooth cold extrusion processing tooth plate in this specific embodiment includes a tooth plate body 1, the upper front end of the tooth plate body 1 protrudes forward to form a front protrusion 2, the top of the front protrusion 2 protrudes upward to form a tooth forming part 3, the front end of the tooth forming part 3 has a tooth shape for processing a single tooth shape of the combining tooth, and the maximum length of the tooth forming part 3 along the front and rear direction of the tooth plate body 1 is less than the width of the annular groove on the combining tooth to be processed.

[0018] In this specific embodiment, the tooth forming portion 3 is formed by the top of the front protrusion 2 and the top of the tooth plate body 1 protruding upwards together.

[0019] In this specific embodiment, an upper inclined surface is formed between the front protrusion 2 and the tooth forming portion 3, extending obliquely upward from the front protrusion 2 toward the rear to the tooth forming portion 3, and a lower inclined surface is formed between the front protrusion 2 and the front end lower portion of the tooth plate body 1, extending obliquely downward from the front protrusion 2 toward the rear to the front end lower portion of the tooth plate body 1.

[0020] In this specific embodiment, the upper inclined surface forms an arc angle with the front protrusion 2 and the tooth forming portion 3 respectively, and the lower inclined surface forms an arc angle with the front protrusion 2 and the front end lower part of the tooth plate body 1 respectively.

[0021] like Figure 2 As shown, a deep groove type combined tooth cold extrusion processing mold includes an upper die base and a lower die base, and a plurality of deep groove type combined tooth cold extrusion processing teeth as described above are distributed in a horizontal circular array on the top surface of the lower die base, and the front end of the tooth body 1 faces the direction of the center of its array, and the tooth body 1 can be slidably connected to the top surface of the lower die base along the radial direction of the circumference of the array, and a tapered sleeve 4 which is coaxial with the circumference of the array of the tooth body 1 is also provided on the outer side of all the tooth body 1, and the tapered sleeve 4 is fixedly connected to the upper die base, and the contact surfaces between the inner hole of the tapered sleeve 4 and the rear end of each tooth body 1 are respectively matched inclined surfaces, and when the tapered sleeve 4 moves downward, the tapered sleeve 4 can synchronously drive each tooth body 1 to move toward the center of the array of the tooth body 1 through the inclined surfaces between the tooth body 1.

[0022] In this specific embodiment, a rubber body is placed on the top surface of the lower mold base and on the inner side of all the tooth body 1. The lower front end of the tooth body 1 abuts against the rubber body. When the tooth body 1 moves toward its inner side, the tooth body 1 can squeeze the rubber body.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described by referring to the preferred embodiments of the utility model, those skilled in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A deep groove type combined tooth cold extrusion processing tooth piece, including a tooth piece body, characterized in that: The upper front end of the tooth plate body protrudes forward to form a front convex portion, and the top of the front convex portion protrudes upward to form a tooth forming portion. The front end of the tooth forming portion has a tooth shape for processing a single tooth shape of a combining tooth, and the maximum length of the tooth forming portion along the front and rear direction of the tooth plate body is less than the width of the annular groove on the combining tooth to be processed.

2. The deep groove type combined tooth cold extrusion processing tooth piece according to claim 1, characterized in that: The tooth forming portion is formed by the top of the front protrusion and the top of the tooth plate body protruding upwards together.

3. The deep groove type combined tooth cold extrusion processing tooth piece according to claim 1, characterized in that: An upper inclined surface is formed between the front protrusion and the tooth forming portion, extending obliquely upward from the front protrusion toward the rear to the tooth forming portion, and a lower inclined surface is formed between the front protrusion and the front lower part of the tooth plate body, extending obliquely downward from the front protrusion toward the rear to the front lower part of the tooth plate body.

4. The deep groove type combined tooth cold extrusion processing tooth piece according to claim 3, characterized in that: The upper inclined surface forms an arc-shaped intersection angle with the front protrusion and the tooth forming portion respectively, and the lower inclined surface forms an arc-shaped intersection angle with the front protrusion and the front end lower part of the tooth plate body respectively.

5. A deep groove combined tooth cold extrusion processing die, comprising an upper die base and a lower die base, characterized in that: A number of deep groove combined tooth cold extrusion processed tooth plates as described in any one of claims 1 to 3 are distributed in a horizontal circular array on the top surface of the lower die base, the front end of the tooth plate body is facing the direction of the center of its array, and the tooth plate body can be slidably connected to the top surface of the lower die base along the radial direction of the circumference of the array, and a tapered sleeve coaxial with the center line of the circumference of the tooth plate body array is also provided on the outside of all the tooth plate bodies, the tapered sleeve is fixedly connected to the upper die base, and the contact surfaces between the inner hole of the tapered sleeve and the rear end of each tooth plate body are respectively matched with inclined surfaces. When the tapered sleeve moves downward, the tapered sleeve can synchronously drive each tooth plate body to move toward the center of the tooth plate body array through the inclined surfaces between the tooth plate bodies.

6. The deep groove type combined tooth cold extrusion processing die according to claim 5, characterized in that: A rubber body is placed on the top surface of the lower die seat and on the inner side of all the tooth plate bodies. The lower front end of the tooth plate body abuts against the rubber body. When the tooth plate body moves toward its inner side, the tooth plate body can squeeze the rubber body.

Images