End face spline connection structure and transmission case

Abstract

The utility model relates to drive system connecting structure technical field especially relates to a kind of end face spline connection structure and transmission case, end face spline connection structure includes first spline part, is set in the end of driving shaft of the transmission case, the first spline part includes multiple tooth slot being spaced apart along the circumferential direction of the driving shaft, the groove bottom of the tooth slot is formed as cambered surface;And second spline part, is set in the end of driven shaft of the transmission case, the second spline part includes multiple convex tooth being spaced apart along the circumferential direction of the driven shaft, multiple the convex tooth is correspondingly inserted in multiple the tooth slot, the convex tooth is provided with stop pin, the first end of the stop pin is formed with cambered surface, the cambered surface of the first end of the stop pin and the cambered surface of the groove bottom of the tooth slot are contacted. This end face spline connection structure and transmission case can solve in existing transmission case, the matching form of spline pair exists NVH abnormal sound and the problem of insufficient safety redundancy.

Description

Technical Field

[0001] This application relates to the field of drive system connection structure technology, and in particular to an end face spline connection structure and a transmission box. Background Technology

[0002] In existing transmission systems, the motor and drive-side components generally employ a split shaft connection structure, with power transmission achieved through spline pairs. In this transmission structure, spline pairs are commonly used for sliding connections. For ease of assembly, the internal and external splines are typically designed as clearance fits.

[0003] However, this fitting method has significant technical drawbacks. When the transmission system vibrates or operates unstablely under load, the clearance between the spline pairs directly affects the transmission accuracy, accelerates the wear of the spline pairs, reduces their service life, and causes abnormal NVH (noise, vibration, and harshness) noise. Furthermore, with the improvement of motor performance and the limitation of assembly space, small-diameter bearings are usually selected in the transmission system to meet the bearing's maximum operating speed requirements. This design constraint severely restricts the radial dimension of the spline pairs, resulting in insufficient safety redundancy in spline strength. Utility Model Content

[0004] In view of this, the purpose of this application is to provide an end-face spline connection structure and a transmission box to solve the problems of NVH noise and insufficient safety redundancy in the spline pair fit in the existing transmission box.

[0005] According to a first aspect of the present invention, an end-face spline connection structure is provided, wherein the end-face spline connection structure includes: a first spline portion disposed at the end of the drive shaft of the transmission box, the first spline portion including a plurality of tooth grooves spaced apart circumferentially along the drive shaft, the bottom of the tooth grooves being formed as arc surfaces; and a second spline portion disposed at the end of the driven shaft of the transmission box, the second spline portion including a plurality of protruding teeth spaced apart circumferentially along the driven shaft, the plurality of protruding teeth being correspondingly inserted into the plurality of tooth grooves, a stop pin being provided on the protruding teeth, the first end of the stop pin being formed as an arc surface, and the arc surface of the first end of the stop pin contacting the arc surface of the bottom of the tooth groove.

[0006] Preferably, a mounting hole is provided at the end of the protruding tooth near the bottom of the groove, the mounting hole extends axially along the driven shaft, the second end of the stop pin is installed in the mounting hole, and the first end of the stop pin protrudes from the end of the protruding tooth.

[0007] Preferably, the mounting hole is a blind hole, and an elastic element is provided inside the mounting hole. The elastic element is located between the bottom of the mounting hole and the second end of the stop pin, and the elastic element continuously applies an elastic force to the stop pin.

[0008] Preferably, a positioning guide pin is provided on the protruding tooth, and the positioning guide pin passes through both the protruding tooth and the stop pin along the radial direction of the driven shaft.

[0009] Preferably, the stop pin has a waist-shaped hole, and the positioning guide pin is inserted through the waist-shaped hole in a manner that allows it to move within the waist-shaped hole.

[0010] Preferably, the first end of the stop pin is formed as a spherical surface, the bottom of the tooth groove is formed as a semi-circular arc surface, and the first end of the stop pin abuts against the bottom of the tooth groove.

[0011] Preferably, the tooth groove further includes a first straight wall surface, which is disposed on both sides of the groove bottom in the circumferential direction. The first straight wall surface extends along the axial direction of the drive shaft, and the protruding tooth is located between the two first straight wall surfaces.

[0012] Preferably, the protruding tooth has a second straight wall surface, which is located on both sides of the protruding tooth in the circumferential direction, and a damping element is provided on the first straight wall surface and / or the second straight wall surface.

[0013] Preferably, a protrusion is formed between two adjacent tooth grooves, and a groove is formed between two adjacent protruding teeth, with a gap provided between the end face of the protrusion near the second spline portion and the bottom of the groove of the groove.

[0014] According to a second aspect of the present invention, a transmission box is provided, wherein the transmission box includes an end face spline connection structure as described above.

[0015] The end-face spline connection structure of this utility model embodiment has a first spline portion disposed at the end of the drive shaft of the transmission box. The first spline portion includes multiple tooth grooves spaced apart circumferentially along the drive shaft, and the bottom of the tooth grooves is formed as an arc surface. The second spline portion is disposed at the end of the driven shaft of the transmission box. The second spline portion includes multiple protruding teeth spaced apart circumferentially along the driven shaft, and the multiple protruding teeth are correspondingly inserted into the multiple tooth grooves. A stop pin is provided on the protruding teeth, and the first end of the stop pin is formed as an arc surface, and the first end of the stop pin contacts the bottom of the tooth groove. In this way, the end-face spline fit can replace the existing sliding spline fit, thereby avoiding the problem of insufficient safety redundancy of spline strength due to the constraint of the radial dimension of the spline. In addition, the stop pin and the bottom of the tooth groove are in arc contact, so that when the driving shaft and the driven shaft are at different speeds, the tooth groove can apply a tangential force to the stop pin to reduce the difference between the driving shaft and the driven shaft, thereby reducing the impact force between the driving shaft and the driven shaft and reducing abnormal noise caused by the impact.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the end face spline connection structure according to this utility model.

[0019] Figure 2 According to this utility model Figure 1 AA sectional view.

[0020] Figure 3 This is a schematic diagram of the drive shaft according to the present invention.

[0021] Figure 4 This is a cross-sectional view of a portion of the structure of the driven shaft according to this utility model.

[0022] Figure 5 This is a schematic diagram of the stop pin of the end face spline connection structure according to this utility model.

[0023] Reference numerals: 1-First spline portion; 11-Groove; 111-Groove bottom; 112-First straight wall surface; 12-Protrusion; 2-Second spline portion; 21-Protruding tooth; 210-Mounting hole; 211-Elastic element; 212-Positioning guide pin; 213-Second straight wall surface; 22-Stop pin; 220-Oval hole; 23-Groove portion; 100-Drive shaft; 200-Driven shaft. Detailed Implementation

[0024] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0025] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0026] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0027] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0028] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0029] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0030] The terminology used herein is for the purpose of describing various examples only and is not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0031] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0032] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0033] like Figures 1 to 5 As shown, according to a first aspect of the present invention, an end-face spline connection structure is provided, the end-face spline connection structure including a first spline portion 1 and a second spline portion 2.

[0034] In the following description, reference will be made to Figures 1 to 5 The specific structure of the above-mentioned components and the connection relationship of the above-mentioned components are described in detail.

[0035] like Figures 1 to 5 As shown, in this embodiment, the first spline portion 1 can be disposed at the end of the drive shaft 100 of the transmission box. The first spline portion 1 includes a plurality of toothed grooves 11 spaced apart circumferentially along the drive shaft 100. The bottom 111 of the toothed grooves 11 can be formed as an arc surface. The second spline portion 2 can be disposed at the end of the driven shaft 200 of the transmission box. The second spline portion 2 can include a plurality of protruding teeth 21 spaced apart circumferentially along the driven shaft 200. The plurality of protruding teeth 21 can be correspondingly inserted into the plurality of toothed grooves 11. With this configuration, the end face spline mating form replaces the existing sliding connection mating form of splines, avoiding the radial dimension of the spline being constrained by the bearing, and effectively improving the structural strength of the spline. A stop pin 22 can also be provided on the protruding teeth 21. The first end of the stop pin 22 can be formed as an arc surface, and the arc surface of the first end of the stop pin 22 contacts the arc surface of the bottom 111 of the toothed groove 11. That is, the stop pin 22 and the bottom 111 of the groove 11 of the tooth groove 11 make arc surface contact, so that when the drive shaft 100 and the driven shaft 200 have a speed difference, the tooth groove 11 can apply a tangential force to the stop pin 22 to reduce the speed difference between the drive shaft 100 and the driven shaft 200, thereby reducing the impact force between the drive shaft 100 and the driven shaft 200 and reducing the abnormal noise caused by the impact.

[0036] Preferred, such as Figures 1 to 4 As shown, in this embodiment, the drive shaft 100 and the driven shaft 200 can be connected by a first spline portion 1 and a second spline portion 2 at their ends. The drive shaft 100 and the driven shaft 200 can be hollow shafts, meaning that axially extending through holes are formed inside the drive shaft 100 and the driven shaft 200. Further, preferably, the drive shaft 100 can be a motor shaft, and the driven shaft 200 can be a gear shaft.

[0037] Preferred, such as Figures 1 to 4 As shown, in this embodiment, the number and position of the protruding teeth 21 can correspond to the tooth grooves 11, so that the protruding teeth 21 can be inserted into the tooth grooves 11 one by one. A mounting hole 210 can be provided at the end of the protruding tooth 21 near the bottom 111 of the tooth groove 11. The mounting hole 210 can extend axially along the driven shaft 200. The second end of the stop pin 22 (e.g. Figure 2 The right end (shown in the diagram) is installed within the mounting hole 210 to radially limit the stop pin 22. The first end of the stop pin 22 (e.g., the right end) is installed within the mounting hole 210. Figure 2 The left end (shown in the diagram) protrudes from the end of the tooth 21, so that the first end of the stop pin 22 can contact the bottom 111 of the tooth groove 11.

[0038] Further optimized, such as Figures 2 to 4 As shown, in this embodiment, the mounting hole 210 can be a blind hole, meaning that the mounting hole 210 does not penetrate the driven shaft 200. An elastic element 211 can also be provided within the mounting hole 210. Specifically, the elastic element 211 can be a spring. One end of the elastic element 211 abuts against the bottom of the mounting hole 210, and the other end abuts against the second end of the stop pin 22. The elastic element 211 remains compressed within the mounting hole 210, allowing it to continuously apply an elastic force to the stop pin 22. This configuration effectively reduces the axial meshing force on the driven shaft 200 and decreases the axial movement of the driven shaft 200 in the meshing state.

[0039] Preferred, such as Figures 1 to 4 As shown, in this embodiment, a positioning guide pin 212 may also be provided on the protruding tooth 21. The positioning guide pin 212 may be a cylindrical pin. The positioning guide pin 212 passes through both the protruding tooth 21 and the stop pin 22 radially along the driven shaft 200, thereby axially limiting the stop pin 22 and preventing it from coming out of the mounting hole 210.

[0040] Furthermore, preferably, such as Figures 2 to 5 As shown, in this embodiment, the stop pin 22 may have a waist-shaped hole 220. The positioning guide pin 22 is inserted into the waist-shaped hole 220 in a manner that allows it to move within the waist-shaped hole 220, meaning that the positioning guide pin 212 can generate relative movement with the stop pin 22. When the first end of the stop pin 22 is compressed, the stop pin 22 can move into the mounting hole 210 and further compress the elastic member 211, at which time the positioning guide pin 212 generates relative movement within the waist-shaped hole 220. When the first end of the stop pin 22 is not compressed, the elastic member 211 drives the stop pin 22 to extend to its limit position, at which point the positioning guide pin 212 abuts against the end of the waist-shaped hole 220 away from the drive shaft 100.

[0041] Preferred, such as Figures 2 to 5As shown, in this embodiment, the first end of the stop pin 22 can be formed as a spherical surface. The bottom 111 of the toothed groove 11 can be formed as a semi-circular arc surface. The first end of the stop pin 22 abuts against the bottom 111 of the toothed groove 11 under the action of the elastic member 211. This arrangement allows the stop pin 22 and the toothed groove 11 to maintain arc surface contact. When the transmission box vibrates or runs unstable under load, a speed difference occurs between the drive shaft 100 and the driven shaft 200. In this case, the contact point between the first end of the stop pin 22 and the bottom 111 of the toothed groove 11 changes, causing the driven shaft 200 to be subjected to a tangential force applied by the stop pin 22, thereby reducing the speed difference between the drive shaft 100 and the driven shaft 200, and thus weakening the impact force between the drive shaft 100 and the driven shaft 200, reducing abnormal noise caused by the impact.

[0042] In addition, preferred, such as Figures 1 to 4 As shown, in this embodiment, the tooth groove 11 may further include a first straight wall surface 112. The first straight wall surface 112 may be disposed on both sides of the circumferential direction of the groove bottom 111, that is, the two ends of the curved surface formed by the groove bottom 111 are respectively connected to two adjacent first straight wall surfaces 112. The first straight wall surface 112 extends axially along the drive shaft 100. When the first spline portion 1 and the second spline portion 2 are engaged, the protruding tooth 21 is located between the two first straight wall surfaces 112, and a tooth gap is formed between the protruding tooth 21 and the first straight wall surface 112.

[0043] Further optimized, such as Figures 1 to 4 As shown, in this embodiment, the protruding tooth 21 may have a second straight wall surface 213. Specifically, the second straight wall surface 213 may be located on both sides of the protruding tooth 21 in the circumferential direction. The second straight wall surface 213 may be parallel to the first straight wall surface 112. Further, preferably, damping elements may be provided on the first straight wall surface 112 and / or the second straight wall surface 213 (i.e., at least one of the first straight wall surface 112 and the second straight wall surface 213 is provided with a damping element). Specifically, the damping element (not shown) may be a flexible material such as rubber to further reduce abnormal noise caused by impact.

[0044] Preferred, such as Figures 1 to 4 As shown, in this embodiment, a protrusion 12 can be formed between two adjacent tooth grooves 11, and a groove 23 can be formed between two adjacent teeth 21. The teeth 21 are inserted into the tooth grooves 11, and the protrusions 12 are inserted into the grooves 23, thereby forming an engagement structure. A gap is formed between the end face of the teeth 21 near the first spline portion 1 and the bottom of the groove 111; a gap is formed between the end face of the protrusion 12 near the second spline portion 2 and the bottom of the groove 23. This arrangement allows the elastic element 211 to absorb the axial force between the drive shaft 100 and the driven shaft 200 to the greatest extent, thereby reducing abnormal noise caused by axial impact.

[0045] Furthermore, according to a second aspect of the present invention, a transmission box is provided, the transmission box including the end face spline connection structure and the transmission box as described above, the transmission box being a vehicle transmission box.

[0046] During use, the end-face spline connection structure replaces the existing sliding spline connection with the end-face spline fit, avoiding the constraint of bearing size on the radial dimension of the spline and effectively improving the structural strength of the spline. The stop pin 22 and the bottom 111 of the toothed groove 11 make arc-surface contact, allowing the toothed groove 11 to apply a tangential force to the stop pin 22 when there is a speed difference between the drive shaft 100 and the driven shaft 200, thereby reducing the speed difference between them and weakening the impact force, effectively reducing abnormal noise caused by impact. The elastic element 211 installed in the mounting groove absorbs the axial force between the drive shaft 100 and the driven shaft 200, further reducing abnormal noise caused by impact.

[0047] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A spline connection structure for end faces, disposed in a transmission box, characterized in that, The end-face spline connection structure includes: A first spline portion is disposed at the end of the drive shaft of the transmission box. The first spline portion includes a plurality of toothed grooves spaced circumferentially along the drive shaft, and the bottom of the toothed grooves is formed as an arc surface; and The second spline portion is disposed at the end of the driven shaft of the transmission box. The second spline portion includes a plurality of protruding teeth spaced apart circumferentially along the driven shaft. The plurality of protruding teeth are correspondingly inserted into a plurality of tooth grooves. A stop pin is provided on the protruding teeth. The first end of the stop pin is formed with an arc surface. The arc surface of the first end of the stop pin contacts the arc surface of the bottom of the tooth groove.

2. The end-face spline connection structure according to claim 1, characterized in that, The end of the protruding tooth near the bottom of the groove has a mounting hole, which extends axially along the driven shaft. The second end of the stop pin is installed in the mounting hole, and the first end of the stop pin protrudes from the end of the protruding tooth.

3. The end-face spline connection structure according to claim 2, characterized in that, The mounting hole is a blind hole, and an elastic element is provided inside the mounting hole. The elastic element is located between the bottom of the mounting hole and the second end of the stop pin, and the elastic element continuously applies an elastic force to the stop pin.

4. The end-face spline connection structure according to claim 2, characterized in that, The tooth is provided with a positioning guide pin, which passes through both the tooth and the stop pin along the radial direction of the driven shaft.

5. The end-face spline connection structure according to claim 4, characterized in that, The stop pin has a waist-shaped hole, and the positioning guide pin is inserted through the waist-shaped hole in a manner that allows it to move within the waist-shaped hole.

6. The end-face spline connection structure according to claim 2, characterized in that, The first end of the stop pin is formed as a spherical surface, and the bottom of the tooth groove is formed as a semi-circular arc surface. The first end of the stop pin abuts against the bottom of the tooth groove.

7. The end-face spline connection structure according to claim 1, characterized in that, The tooth groove also includes a first straight wall surface, which is disposed on both sides of the bottom of the groove in the circumferential direction. The first straight wall surface extends along the axial direction of the drive shaft, and the protruding tooth is located between the two first straight wall surfaces.

8. The end-face spline connection structure according to claim 7, characterized in that, The protruding tooth has a second straight wall surface, which is located on both sides of the protruding tooth in the circumferential direction. A damping element is provided on the first straight wall surface and / or the second straight wall surface.

9. The end-face spline connection structure according to claim 7, characterized in that, A protrusion is formed between two adjacent tooth grooves, and a groove is formed between two adjacent protrusions. A gap is provided between the end face of the protrusion near the second spline portion and the bottom of the groove of the groove.

10. A transmission box, characterized in that, The transmission box includes the end face spline connection structure as described in any one of claims 1 to 9.

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