Gear rolling cutter for spline shaft

Abstract

The gear rolling cutter for the spline shaft comprises a cutter body, a plurality of spline teeth are arranged on the cutter body, the spline teeth comprise the first spline teeth and the second spline teeth in the axial direction, the tooth thickness of the second spline teeth is smaller than that of the first spline teeth, and the inner diameter of the root circle of the second spline teeth is smaller than that of the root circle of the first spline teeth. The projection of the second spline teeth on the first spline teeth is located in the contour of the first spline teeth. According to the gear rolling cutter for the spline shaft, the spline teeth comprise the first spline teeth and the second spline teeth in the axial direction, the first spline teeth are used for machining an outer spline on the shaft, the second spline teeth are used for machining an assembly guide part on the shaft, and therefore the outer spline and the assembly guide part can be machined on the shaft at a time, and the machining efficiency is improved; and the processing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motor manufacturing, in particular to a gear rolling cutter for a spline shaft. Background Art

[0002] The motor output shaft and the transmission gear are splined. The spline connection consists of an internal spline and an external spline. The external spline on the motor output shaft usually has no assembly guide, which makes it difficult to align during assembly, affecting assembly efficiency. Cold pressing sometimes causes damage to the spline.

[0003] In the prior art, in order to solve the problem of difficulty in aligning the internal and external splines, the first method is to use hot pressing, that is, to heat the gear and press it with the motor output shaft. The second method is to use a hobbing machine to process the spline assembly guide part, and use the assembly guide part to align the gear external spline for assembly.

[0004] In the process of realizing the utility model, the inventor found that the prior art has at least the following problems: the first method has high power loss and high processing cost. The second method requires two clampings and the gear hobbing machine needs to add a gear separation device, which has high processing cost. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] Therefore, the utility model aims to provide a spline shaft gear rolling cutter which can process the external spline and the assembly guide part on the shaft at one time.

[0007] To achieve the above-mentioned purpose, the utility model proposes a gear rolling cutter for a spline shaft, comprising a cutter body, on which a plurality of spline teeth are arranged, wherein the spline teeth include a first spline tooth and a second spline tooth along the axial direction, the tooth thickness of the second spline tooth is smaller than the tooth thickness of the first spline tooth, the inner diameter of the root circle of the second spline tooth is smaller than the inner diameter of the root circle of the first spline tooth, and the projection of the second spline tooth on the first spline tooth is located within the outline of the first spline tooth.

[0008] According to the gear rolling cutter for a spline shaft of the utility model, the spline teeth include a first spline tooth and a second spline tooth along the axial direction, the tooth thickness of the second spline tooth is smaller than the tooth thickness of the first spline tooth, the inner diameter of the root circle of the second spline tooth is smaller than the inner diameter of the root circle of the first spline tooth, the projection of the second spline tooth on the first spline tooth is located within the contour of the first spline tooth, the first spline tooth is used to process the external spline on the shaft, and the second spline tooth is used to process the assembly guide part on the shaft, so the external spline and the assembly guide part can be processed on the shaft at one time, the processing efficiency is improved, and the processing cost is reduced.

[0009] According to an embodiment of the present invention, the top end of the first spline tooth and the top end of the second spline tooth are located in the same plane.

[0010] According to an embodiment of the utility model, the blade body includes a first blade body and a second blade body, the first spline teeth are arranged on the first blade body, the second spline teeth are arranged on the second blade body, and the first blade body and the second blade body are detachably connected.

[0011] According to an embodiment of the utility model, it also includes a pressing plate, the pressing plate is in contact with the second blade body, and the pressing plate and the second blade body are detachably connected.

[0012] According to an embodiment of the utility model, it also includes a positioning pin, and the first blade body, the second blade body and the pressure plate are all provided with a plurality of pin holes, and the pin holes are used to insert the positioning pin.

[0013] According to an embodiment of the utility model, it also includes a first fastener, the first blade body is provided with a countersunk hole, the second blade body is provided with a through hole, the pressure plate is provided with a threaded hole, the countersunk hole, the through hole and the threaded hole are coaxial and are used to extend into the first fastener.

[0014] According to an embodiment of the present utility model, the first blade body, the second blade body and the pressing plate are provided with coaxial mounting holes.

[0015] According to an embodiment of the utility model, it further comprises a bottom plate and a second fastener, wherein the bottom plate is arranged at the bottom of the knife body and the pressure plate, and the bottom plate is connected to the knife body via the second fastener.

[0016] According to an embodiment of the utility model, the two end surfaces of the bottom plate are located outside the two end surfaces of the knife body.

[0017] According to an embodiment of the utility model, the spline teeth include three parts in sequence along the length direction of the cutter body: rough rolling teeth, calibration teeth and exit teeth.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. In addition, the same reference symbols are used throughout the accompanying drawings to represent the same components. Among them:

[0020] Figure 1The utility model is a schematic structural diagram of a gear rolling cutter for a spline shaft provided in one embodiment.

[0021] Figure 2 yes Figure 1 A local enlarged schematic diagram of point A in the middle.

[0022] Figure 3 The utility model is a side view of a gear rolling cutter for a spline shaft according to one embodiment of the utility model.

[0023] Figure 4 The utility model is a schematic diagram of the bottom structure of a gear rolling cutter for a spline shaft according to an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1-base plate, 2-first fastener, 3-locating pin, 4-mounting hole, 5-first cutter body, 6-second cutter body, 7-pressing plate, 8-second fastener, 51-first spline tooth, 61-second spline tooth. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0027] Combination Figure 1 , Figure 2 As shown, an embodiment of the utility model proposes a gear rolling cutter for a spline shaft, including a cutter body, on which a plurality of spline teeth are arranged, the spline teeth including a first spline tooth 51 and a second spline tooth 61 along the axial direction, the tooth thickness of the second spline tooth 61 is smaller than the tooth thickness of the first spline tooth 51, the inner diameter of the root circle of the second spline tooth 61 is smaller than the inner diameter of the root circle of the first spline tooth 51, and the projection of the second spline tooth 61 on the first spline tooth 51 is located within the outline of the first spline tooth 51.

[0028] Axial Figure 1The left and right directions of the middle blade body are the width directions of the blade body. The material of the blade body can be mold steel with higher hardness. The number of the first spline teeth 51 and the second spline teeth 61 is set according to actual needs, and there is no specific limitation on this. The first spline teeth 51 and the second spline teeth 61 are both straight teeth. The first spline teeth 51 are used to process the standard external splines on the shaft, and the second spline teeth 61 are used to process the assembly guide part on the shaft. The external splines on the assembly guide part are thinner than the tooth thickness of the standard external splines. The external splines on the assembly guide part and the internal splines of the external gear are clearance fit, which is conducive to extending into the internal splines of the external gear. The standard external splines on the shaft and the internal splines of the external gear are interference fit. When the assembly guide part is fully extended into the internal splines of the external gear, the standard external splines on the shaft and the internal splines of the external gear are assembled together by cold pressing.

[0029] Since the length of the assembly guide portion is shorter, the length of the second spline tooth 61 in the axial direction is less than the length of the first spline tooth 51. The difference between the tooth thickness of the second spline tooth 61 and the tooth thickness of the first spline tooth 51 is designed according to actual needs. Exemplarily, the difference between the tooth thickness of the second spline tooth 61 and the tooth thickness of the first spline tooth 51 is 0.05 mm, which is conducive to guiding. Correspondingly, the difference between the inner diameter of the root circle of the second spline tooth 61 and the inner diameter of the root circle of the first spline tooth 51 is designed according to actual needs. Exemplarily, the difference between the inner diameter of the root circle of the second spline tooth 61 and the inner diameter of the root circle of the first spline tooth 51 is 0.05 mm, which is conducive to guiding.

[0030] According to the embodiment of the utility model, the spline shaft rolling cutter includes the first spline tooth and the second spline tooth in the axial direction, the tooth thickness of the second spline tooth is smaller than the tooth thickness of the first spline tooth, the inner diameter of the root circle of the second spline tooth is smaller than the inner diameter of the root circle of the first spline tooth, the projection of the second spline tooth on the first spline tooth is located within the contour of the first spline tooth, the first spline tooth is used to process the external spline on the shaft, and the second spline tooth is used to process the assembly guide part on the shaft. Therefore, the external spline and the assembly guide part can be processed on the shaft at one time, the processing efficiency is improved, and the processing cost is reduced.

[0031] In some embodiments, Figure 2 As shown, the top of the first spline tooth 51 and the top of the second spline tooth 61 are located in the same plane, which is convenient for guiding the standard external spline on the shaft and the internal spline of the external gear.

[0032] The applicant has found that it is not easy to process two sets of spline teeth on one gear rolling cutter. Therefore, in order to reduce the difficulty of manufacturing, in some embodiments, the cutter body of the gear rolling cutter for spline shaft adopts a split design, and each cutter body is individually processed with spline teeth. The cutter body includes a first cutter body 5 and a second cutter body 6, the first spline teeth 51 are arranged on the first cutter body 5, and the second spline teeth 61 are arranged on the second cutter body 6, and the first cutter body 5 and the second cutter body 6 are detachably connected. The first cutter body 5 and the second cutter body 6 are made of the same material, such as mold steel with a hardness of HRC60-62. The first cutter body 5 and the second cutter body 6 can be detachably connected by bolt connection, bayonet connection, etc. Any cutter body that is damaged can be easily replaced.

[0033] In some embodiments, Figure 1 As shown, the gear rolling cutter for the spline shaft also includes a pressing plate 7, which is in contact with the second cutter body 6, and the pressing plate 7 and the second cutter body 6 are detachably connected. The upper surface of the pressing plate 7 is not higher than the root circle height of the second spline teeth 61 to avoid affecting the processing. The pressing plate 7 connects the first cutter body 5 and the second cutter body 6 together to ensure that the gear rolling cutter has better strength.

[0034] like Figure 3 As shown, the spline shaft gear rolling cutter also includes a positioning pin 3, and the first cutter body 5, the second cutter body 6 and the pressure plate 7 are all provided with a plurality of pin holes, and the pin holes are used to insert the positioning pin 3. The positioning pin and the pin hole play a positioning role when the first cutter body 5, the second cutter body 6 and the pressure plate 7 are connected together.

[0035] The spline shaft gear rolling cutter also includes a first fastener 2, a first cutter body 5 is provided with a countersunk hole, a second cutter body 6 is provided with a through hole, and a pressure plate 7 is provided with a threaded hole. The countersunk hole, the through hole and the threaded hole are coaxial and are used to extend into the first fastener 2. The number and position of the first fastener 2 are designed according to actual needs and are not specifically limited. The first fastener 2 can use a screw, and the screw head and the screw rod are both located inside the cutter body to keep the surface of the cutter body flat.

[0036] In addition, the first cutter body 5, the second cutter body 6 and the pressing plate 7 are provided with coaxial mounting holes 4. The mounting holes 4 can cooperate with the fasteners on the gear rolling machine to connect the gear rolling cutter and the gear rolling machine together. The position and number of the mounting holes 4 are selected according to actual needs. Figure 4 As shown, the gear rolling cutter for spline shaft also includes a bottom plate 1 and a second fastener 8. The bottom plate 1 is arranged at the bottom of the cutter body and the pressure plate 7, and the bottom plate 1 and the cutter body are connected by the second fastener 8. The screw hole adapted to the second fastener 8 is a countersunk hole, which keeps the bottom surface of the pressure plate 7 flat. The two end faces of the bottom plate 1 are located outside the two end faces of the cutter body. In other words, the bottom plate 1 is longer than the cutter body, and the purpose is to install the bottom plate on the gear rolling machine.

[0037] The spline shaft rolling cutter of this embodiment has three parts of spline teeth, namely, rough rolling teeth, calibration teeth and exit teeth, in sequence along the length direction of the cutter body. The thickness of the rough rolling teeth is smaller than that of the calibration teeth, and the exit teeth can perform fine finishing on the teeth on the shaft.

[0038] When manufacturing the spline shaft gear rolling cutter of the utility model embodiment, the first cutter body, the second cutter body and the pressure plate are processed and heat treated, and then assembled together using positioning pins and fixed with a high-strength first fastener. The bottom surfaces of the first cutter body, the second cutter body and the pressure plate are ground flat to ensure that the three surfaces are level. Then, after being connected with the bottom plate of the high-strength second fastener, a spline shaft gear rolling cutter with a guide is manufactured.

[0039] When the spline shaft gear rolling cutter of the utility model embodiment is used, it is installed on a gear rolling machine, and a certain pressure is applied to the surface of the shaft part to cause plastic deformation of the surface of the shaft part, and the standard external splines on the shaft and the external splines on the assembly guide part are extruded at one time, which has the characteristics of high processing efficiency and low cost.

[0040] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the description of the present invention, the directions or positional relationships indicated by the terms "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0044] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A gear rolling cutter for a spline shaft, characterized in that: The invention comprises a knife body, on which a plurality of spline teeth are arranged, wherein the spline teeth comprise a first spline tooth (51) and a second spline tooth (61) along the axial direction, the tooth thickness of the second spline tooth (61) is smaller than the tooth thickness of the first spline tooth (51), the inner diameter of the root circle of the second spline tooth (61) is smaller than the inner diameter of the root circle of the first spline tooth (51), and the projection of the second spline tooth (61) on the first spline tooth (51) is located within the contour of the first spline tooth (51).

2. The gear rolling cutter for a spline shaft according to claim 1, characterized in that: The top end of the first spline tooth (51) and the top end of the second spline tooth (61) are located in the same plane.

3. The gear rolling cutter for a spline shaft according to claim 1, characterized in that: The blade body comprises a first blade body (5) and a second blade body (6); the first spline teeth (51) are arranged on the first blade body (5); the second spline teeth (61) are arranged on the second blade body (6); and the first blade body (5) and the second blade body (6) are detachably connected.

4. The gear rolling cutter for a spline shaft according to claim 3, characterized in that: It also comprises a pressing plate (7), wherein the pressing plate (7) is in contact with the second blade body (6), and the pressing plate (7) and the second blade body (6) are detachably connected.

5. The gear rolling cutter for a spline shaft according to claim 4, characterized in that: It also includes a positioning pin (3), and the first blade body (5), the second blade body (6) and the pressing plate (7) are all provided with a plurality of pin holes, and the pin holes are used for inserting the positioning pin (3).

6. The gear rolling cutter for a spline shaft according to claim 5, characterized in that: It also includes a first fastener (2), the first blade body (5) is provided with a countersunk hole, the second blade body (6) is provided with a through hole, the pressing plate (7) is provided with a threaded hole, and the countersunk hole, the through hole and the threaded hole are coaxial and are used to extend into the first fastener (2).

7. The gear rolling cutter for a spline shaft according to claim 5, characterized in that: The first blade body (5), the second blade body (6) and the pressing plate (7) are provided with coaxial mounting holes (4).

8. The gear rolling cutter for a spline shaft according to claim 7, characterized in that: It also comprises a base plate (1) and a second fastener (8), wherein the base plate (1) is arranged at the bottom of the knife body and the pressure plate (7), and the base plate (1) is connected to the knife body via the second fastener (8).

9. The gear rolling cutter for a spline shaft according to claim 8, characterized in that: The two end surfaces of the bottom plate (1) are located outside the two end surfaces of the knife body.

10. The gear rolling cutter for a spline shaft according to any one of claims 1 to 9, characterized in that: The spline teeth include three parts, namely, rough rolling teeth, calibration teeth and exit teeth, in sequence along the length direction of the cutter body.

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