Intermediate shaft and transmission gear connecting assembly, speed reducing mechanism and vehicle

Abstract

The invention discloses an intermediate shaft and transmission gear connecting assembly, a speed reducing mechanism and a vehicle, the intermediate shaft and transmission gear connecting assembly comprises an intermediate shaft and a transmission gear, an inner spline is arranged on the circumferential surface of a center hole of the transmission gear, an outer spline is arranged on the circumferential surface of a torque output section of the intermediate shaft, and the outer spline is arranged on the circumferential surface of the torque output section of the intermediate shaft in the direction from the torque input section to the torque output section of the intermediate shaft. In the direction from the torque output section to the torque input section, external spline teeth of the external spline are gradually widened, external spline grooves of the external spline are gradually narrowed, and / or in the direction from the torque output section to the torque input section, internal spline teeth of the internal spline are gradually widened, internal spline grooves of the internal spline are gradually narrowed, and the internal spline is in interference fit with the external spline. By changing the structure of the spline, the spline can be prevented from being separated, the axial size of a product cannot be additionally increased, the spline cannot be separated due to impact and other influences, and the stability of the connecting structure is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of speed reducers, and particularly relates to a connecting component between an intermediate shaft and a transmission gear, a speed reduction mechanism, and a vehicle. Background Art

[0002] The electric drive two-stage speed reducer includes a differential, an intermediate shaft, and a speed reduction output shaft. Among them, the intermediate shaft is also called the first-stage reduction shaft, and the speed reduction output shaft is also called the second-stage reduction shaft. A driving gear is configured on the differential, and teeth are configured at the torque input end of the intermediate shaft to mesh and drive with the driving gear. An external spline is configured at the torque output end of the intermediate shaft to cooperate and drive with an internal spline in the central hole of the transmission gear. The transmission gear is also called the first-stage driven gear. Teeth are configured at the torque input end of the speed reduction output shaft to mesh and drive with the transmission gear. The reduced torque is finally output by the speed reduction output shaft.

[0003] The reliability of the interference connection of the spline is greatly affected by the dimensional stability of the spline. Once the dimensions are unstable, the spline is extremely likely to disengage under the loaded condition. Therefore, the current solutions to prevent the spline from disengaging are mainly the following two:

[0004] In the prior art, the connection methods between the intermediate shaft and the transmission gear include the following two:

[0005] The first one: A snap ring is used for restraint on one side where the transmission gear is adopted. However, under the action of system force and impact, the snap ring is prone to the risk of failure.

[0006] The second one: A nut is used for locking on one side where the transmission gear is adopted. However, the method of using a nut for locking increases the axial dimension of the system and increases the assembly difficulty. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a connecting component between an intermediate shaft and a transmission gear, a speed reduction mechanism, and a vehicle. By changing the self-structure of the spline, the spline disengagement can be prevented, the axial dimension of the product will not be additionally increased, and the spline will not disengage due to impacts and the like, thereby improving the stability of the connection structure.

[0008] The technical solution of the present invention provides a connecting component between an intermediate shaft and a transmission gear, including an intermediate shaft and a transmission gear;

[0009] An internal spline is provided on the circumferential surface of the central hole of the transmission gear. The internal spline includes a plurality of internal spline teeth evenly distributed along the circumferential direction of the central hole. There is an internal spline groove between any two adjacent internal spline teeth;

[0010] The intermediate shaft includes a torque input section and a torque output section connected to the torque input section. An external spline is provided on the outer peripheral surface of the torque output section. The external spline includes a plurality of external spline teeth evenly distributed circumferentially along the torque output section, and there is an external spline groove between any two adjacent external spline teeth;

[0011] The torque output section passes through the central hole, and the internal spline is in interference fit with the external spline. Each external spline tooth is in interference fit in an internal spline groove, and each internal spline tooth is in interference fit in an external spline groove;

[0012] Wherein, along the direction from the torque input section to the torque output section, the external spline teeth gradually become wider and the external spline grooves gradually become narrower; and / or, along the direction from the torque output section to the torque input section, the internal spline teeth gradually become wider and the internal spline grooves gradually become narrower.

[0013] In one optional technical solution, the external spline teeth include two relatively arranged external spline tooth sides;

[0014] Along the direction from the torque input section to the torque output section, the distance between the two external spline tooth sides gradually increases.

[0015] In one optional technical solution, one external spline tooth side is parallel to the axis of the intermediate shaft, and the other external spline tooth side extends obliquely with respect to the axis of the intermediate shaft; or, the two external spline tooth sides respectively extend obliquely with respect to the axis of the intermediate shaft, and the two external spline tooth sides are symmetrically arranged with respect to the axis of the intermediate shaft.

[0016] In one optional technical solution, the internal spline teeth include two relatively arranged internal spline tooth sides;

[0017] Along the direction from the torque output section to the torque input section, the distance between the two internal spline tooth sides gradually increases.

[0018] In one optional technical solution, one internal spline tooth side is parallel to the center line of the central hole, and the other internal spline tooth side extends obliquely with respect to the center line of the central hole; or, the two internal spline tooth sides respectively extend obliquely with respect to the center line of the central hole, and the two internal spline tooth sides are symmetrically arranged with respect to the center line of the central hole.

[0019] In one optional technical solution, the external spline teeth are in left - hand or right - hand form, and the helix angle of the external spline teeth is between 15° and 25°; and / or, the internal spline teeth are in left - hand or right - hand form, and the helix angle of the internal spline teeth is between 15° and 25°.

[0020] In one of the alternative technical solutions, the diameter of the torque input section is greater than that of the torque output section, and a stop surface for stopping the transmission gear is formed at the junction of the torque output section and the torque input section.

[0021] In one of the alternative technical solutions, the transmission gear and the torque output section are assembled by a hot pressing connection process.

[0022] The technical solution of the present invention further provides a reduction mechanism, including a differential, a reduction output shaft, and an intermediate shaft and transmission gear connection assembly according to any one of the foregoing technical solutions;

[0023] A driving gear is connected to the differential, the driving gear is connected to the torque input section, and the transmission gear is connected to the reduction output shaft.

[0024] The technical solution of the present invention further provides a vehicle, including the reduction mechanism according to the foregoing technical solution.

[0025] Adopting the above technical solution, the following beneficial effects are achieved:

[0026] An intermediate shaft and transmission gear connection assembly, a reduction mechanism and a vehicle provided by the present invention. The intermediate shaft and transmission gear connection assembly includes an intermediate shaft and a transmission gear. An internal spline is provided on the circumferential surface of the central hole of the transmission gear, and an external spline is provided on the outer circumferential surface of the torque output section of the intermediate shaft. Wherein, along the direction from the torque input section to the torque output section of the intermediate shaft, the external spline teeth of the external spline gradually become wider, and the external spline grooves of the external spline gradually become narrower, and / or, along the direction from the torque output section to the torque input section, the internal spline teeth of the internal spline gradually become wider, and the internal spline grooves of the internal spline gradually become narrower.

[0027] During assembly, the torque output section passes through the central hole, and the internal spline and the external spline are in interference fit, that is, each external spline tooth is in interference fit in an internal spline groove, and each internal spline tooth is in interference fit in an external spline groove. And because the end of the external spline tooth far from the torque input section is wide, and / or, the end of the internal spline tooth close to the torque input section is wide. When the transmission gear and the torque output section are respectively subjected to tensile forces and the transmission gear moves away from the torque input section, the interference fit amount between the gradually widened external spline tooth and the internal spline groove is larger, and / or, the interference fit amount between the gradually widened internal spline tooth and the external spline groove is larger, and the tensile force that can be resisted is greater. It can effectively prevent the transmission gear from disengaging from the torque output section. By changing the structure of the spline itself, the spline disengagement can be prevented, the axial dimension of the product will not be additionally increased, and the spline will not be disengaged due to impacts or the like, improving the stability of the connection structure. Description of the Drawings

[0028] Referring to the accompanying drawings, the disclosure of the present invention will become more readily understood. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings:

[0029] Figure 1 It is a cross-sectional view of a connecting assembly between an intermediate shaft and a transmission gear provided in an embodiment of the present invention;

[0030] Figure 2 It is a three-dimensional view of an external spline provided on the torque output section of the intermediate shaft;

[0031] Figure 3 It is a schematic diagram in which one side surface of an external spline tooth is parallel to the axis of the intermediate shaft, and the other side surface of the external spline tooth extends obliquely with respect to the axis of the intermediate shaft;

[0032] Figure 4 It is a schematic diagram in which two side surfaces of an external spline tooth extend obliquely with respect to the axis of the intermediate shaft respectively, and the two side surfaces of the external spline tooth are symmetrically arranged;

[0033] Figure 5 It is a three-dimensional view of the transmission gear;

[0034] Figure 6 It is a schematic diagram in which one side surface of an internal spline tooth is parallel to the center line of the central hole, and the other side surface of the internal spline tooth extends obliquely with respect to the center line of the central hole;

[0035] Figure 7 It is a schematic diagram in which two side surfaces of an internal spline tooth extend obliquely with respect to the center line of the central hole respectively, and the two side surfaces of the internal spline tooth are symmetrically arranged;

[0036] Figure 8 It is a cross-sectional view of a reduction mechanism provided in an embodiment of the present invention. Detailed Embodiments

[0037] The following further illustrates the detailed embodiments of the present invention with reference to the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0038] As Figures 1 - 7 shown, a connecting assembly between an intermediate shaft and a transmission gear provided in an embodiment of the present invention includes an intermediate shaft 1 and a transmission gear 2.

[0039] On the circumferential surface of the central hole 21 of the transmission gear 2, an internal spline 22 is provided. The internal spline 22 includes a plurality of internal spline teeth 221 evenly distributed along the circumferential direction of the central hole 21, and there is an internal spline groove 222 between any two adjacent internal spline teeth 221.

[0040] The intermediate shaft 1 includes a torque input section 11 and a torque output section 12 connected to the torque input section 11. On the outer circumferential surface of the torque output section 12, an external spline 15 is provided. The external spline 15 includes a plurality of external spline teeth 151 evenly distributed along the circumferential direction of the torque output section 12, and there is an external spline groove 152 between any two adjacent external spline teeth 151.

[0041] The torque output section 12 passes through the central hole 21, and the internal spline 22 is in interference fit with the external spline 15. Each external spline tooth 151 is in interference fit in an internal spline groove 222, and each internal spline tooth 221 is in interference fit in an external spline groove 152.

[0042] Wherein, along the direction from the torque input section 11 to the torque output section 12, the external spline teeth 151 gradually become wider, and the external spline grooves 152 gradually become narrower, and / or, along the direction from the torque output section 12 to the torque input section 11, the internal spline teeth 221 gradually become wider, and the internal spline grooves 222 gradually become narrower.

[0043] An intermediate shaft and transmission gear connection assembly provided by the present invention is a component in a reduction mechanism, and it includes an intermediate shaft 1 and a transmission gear 2.

[0044] The intermediate shaft 1 includes a torque input section 11 and a torque output section 12. The torque input section 11 and the torque output section 12 are integrally connected and coaxially arranged. Meshing teeth 14 are provided on the torque input section 11 for meshing and driving with Figure 8 the driving gear 5 on the differential 3 as shown. The transmission gear 2 is assembled on the torque output section 12. The torque output by the differential 3 is transmitted to the torque input section 11 through the driving gear 5, and then transmitted to the reduction output shaft 4 through the transmission gear 2. The radius of the driving gear 5 is larger than the radius of the meshing teeth 14 on the torque input section 11, realizing primary reduction. The radius of the transmission gear 2 is larger than the radius of the meshing teeth 41 on the reduction output shaft 4, realizing secondary reduction.

[0045] An external spline 15 is provided on the outer circumferential surface of the torque output section 12, and an internal spline 22 is provided on the circumferential surface of the central hole 21 of the transmission gear 2. The transmission gear 2 and the torque output section 12 are connected by splines.

[0046] The external spline 15 includes a plurality of external spline teeth 151 evenly distributed circumferentially along the torque output section 12, and there is an external spline groove 152 between any two adjacent external spline teeth 151. The basic parameters of the external spline 15 can be selected as follows: module m = 1, number of teeth Z = 44, pressure angle α = 30°, and tooth surface roughness Ra1.6.

[0047] Among them, along the axial direction of the intermediate shaft 1, the widths of each external spline tooth 151 and external spline groove 152 gradually change in the circumferential direction. Specifically, in the direction from the torque input section 11 to the torque output section 12, the external spline tooth 151 gradually becomes wider, and the external spline groove 152 gradually becomes narrower.

[0048] The internal spline 22 includes a plurality of internal spline teeth 221 evenly distributed circumferentially along the central hole 21, and there is an internal spline groove 222 between any two adjacent internal spline teeth 221. The basic parameters of the internal spline 22 can be selected as follows: module m = 1, number of teeth Z = 44, pressure angle α = 30°, and tooth surface roughness Ra1.6.

[0049] Among them, along the axial direction of the central hole 21, the widths of each internal spline tooth 221 and internal spline groove 222 gradually change in the circumferential direction. Specifically, in the direction from the torque output section 12 to the torque input section 11, the internal spline tooth 221 gradually becomes wider, and the internal spline groove 222 gradually becomes narrower.

[0050] During assembly, the torque output section 12 passes through the central hole 21, and the internal spline 22 is in interference fit with the external spline 15, that is, each external spline tooth 151 is in interference fit in an internal spline groove 222, and each internal spline tooth 221 is in interference fit in an external spline groove 152. Since the end of the external spline tooth 151 far from the torque input section 11 is wide, and / or the end of the internal spline tooth 221 close to the torque input section 11 is wide, when the transmission gear 2 and the torque output section 12 are respectively subjected to tensile forces such that the transmission gear 2 moves away from the torque input section 11, the interference fit amount between the gradually widened external spline tooth 151 and the internal spline groove 222 is larger, and / or the interference fit amount between the gradually widened internal spline tooth 221 and the external spline groove 152 is larger, and the tensile force that can be resisted is greater, which can effectively prevent the transmission gear 2 from disengaging from the torque output section 12. By changing the self-structure of the spline, the spline disengagement can be prevented, the axial dimension of the product will not be additionally increased, and the spline will not disengage due to impacts or the like, improving the stability of the connection structure.

[0051] In one embodiment, as Figures 3 - 4 shown, the external spline tooth 151 includes two opposite external spline tooth sides 1511. In the direction from the torque input section 11 to the torque output section 12, the distance between the two external spline tooth sides 1511 gradually increases.

[0052] That is to say, the two outer spline tooth sides 1511 are two opposite arranged vertical surfaces of the outer spline tooth 151 along the circumferential direction of the torque output section 12, and the outer spline groove 152 is formed between two adjacent outer spline tooth sides 1511 of the two outer spline teeth 151. In the direction from the torque input section 11 to the torque output section 12, the distance between the two outer spline tooth sides 1511 gradually increases, so the width of the outer spline tooth 151 will gradually become wider, and the outer spline groove 152 will gradually become narrower accordingly.

[0053] In one embodiment, as Figures 3 - 4 shown, one outer spline tooth side 1511 is parallel to the axis (A - B) of the intermediate shaft 1, and the other outer spline tooth side 1511 extends obliquely with respect to the axis (A - B) of the intermediate shaft 1. Alternatively, the two outer spline tooth sides 1511 respectively extend obliquely with respect to the axis (A - B) of the intermediate shaft 1, and the two outer spline tooth sides 1511 are symmetrically arranged with respect to the axis (A - B) of the intermediate shaft 1. Viewed from one end of the intermediate shaft 1, the inclined other outer spline tooth side 1511 can extend leftward or rightward, so that the outer spline tooth 151 is in a left - hand or right - hand helix mode.

[0054] As required, one outer spline tooth side 1511 can be kept parallel to the axis (A - B) of the intermediate shaft 1 and used as a straight surface, while the other outer spline tooth side 1511 extends obliquely with respect to the axis (A - B) of the intermediate shaft 1 and is used as an inclined surface, so as to form the outer spline tooth 151 and the outer spline groove 152 that are roughly wedge - shaped or V - shaped, having a certain taper, and the outer spline 15 has a certain spiral direction or inclined direction, and the anti - detachment performance is better. As required, the two outer spline tooth sides 1511 can be symmetrically arranged with respect to the axis (A - B) of the intermediate shaft 1, and each outer spline tooth side 1511 extends obliquely with respect to the axis (A - B) of the intermediate shaft 1, so as to form the outer spline tooth 151 and the outer spline groove 152 that are roughly isosceles trapezoid - shaped, with a symmetrical structure and being convenient for machining and forming.

[0055] In one embodiment, as Figures 6 - 7 shown, the inner spline tooth 221 includes two relatively arranged inner spline tooth sides 2211.

[0056] In the direction along from the torque output section 12 to the torque input section 11, the distance between the two inner spline tooth sides 2211 gradually increases.

[0057] That is to say, the two inner spline tooth sides 2211 are two opposite arranged vertical surfaces of the inner spline tooth 221 along the circumferential direction of the central hole 21, and the inner spline groove 222 is formed between two adjacent inner spline tooth sides 2211 of the two inner spline teeth 221. In the direction from the torque output section 12 to the torque input section 11, the distance between the two inner spline tooth sides 2211 gradually increases, so the width of the inner spline tooth 221 will gradually become wider, and the inner spline groove 222 will gradually become narrower accordingly.

[0058] In one embodiment, as Figures 6 - 7 shown, one inner spline tooth side 2211 is parallel to the center line (C-D) of the central hole 21, and the other inner spline tooth side 2211 extends obliquely with respect to the center line (C-D) of the central hole 21. Alternatively, the two inner spline tooth sides 2211 respectively extend obliquely with respect to the center line (C-D) of the central hole 21, and the two inner spline tooth sides 2211 are symmetrically arranged with respect to the center line (C-D) of the central hole 21.

[0059] According to needs, one inner spline tooth side 2211 can be kept parallel to the center line (C-D) of the central hole 21 and used as a straight surface, while the other inner spline tooth side 2211 extends obliquely with respect to the center line (C-D) of the central hole 21 and is used as an inclined surface, so as to form an inner spline tooth 221 and an inner spline groove 222 that are roughly wedge-shaped or inverted V-shaped, with a certain taper. The inner spline 22 has a certain spiral direction or inclined direction, and the anti-disengagement performance is better. When viewed from one end of the transmission gear 2, the inclined other inner spline tooth side 2211 can extend leftward or rightward, so that the inner spline tooth 221 is in a left-handed or right-handed manner.

[0060] According to needs, the two inner spline tooth sides 2211 can be symmetrically arranged with respect to the center line (C-D) of the central hole 21, and each inner spline tooth side 2211 extends obliquely with respect to the center line (C-D) of the central hole 21, so as to form an inner spline tooth 221 and an inner spline groove 222 that are roughly isosceles trapezoidal, with a symmetrical structure and being convenient for processing and forming.

[0061] In one embodiment, the external spline teeth 151 are in a left-handed or right-handed manner, the helix angle of the external spline teeth 151 is between 15° and 25°, and / or the internal spline teeth 221 are in a left-handed or right-handed manner, and the helix angle of the internal spline teeth 221 is between 15° and 25°.

[0062] In this embodiment, the external spline teeth 151 and the internal spline teeth 221 can be selected to be in a left-handed or right-handed manner according to needs, and the helix angle is set between 15° and 25°, which has high anti-torsion transmission ability and anti-disengagement ability.

[0063] Preferably, the spiral angle is set to 20°, and the anti-torsion transmission ability and anti-disengagement ability are optimal.

[0064] In one embodiment, as Figure 1 shown, the diameter of the torque input section 11 is larger than the diameter of the torque output section 12, and a stop surface 13 for stopping the transmission gear 2 is formed at the connection between the torque output section 12 and the torque input section 11.

[0065] In this embodiment, by forming the stop surface 13 at the connection between the torque output section 12 and the torque input section 11, it is used to limit the movement of the transmission gear 2 towards the torque input section 11 side, and there is no need to specially set a retaining ring, snap ring, etc.

[0066] In one embodiment, the transmission gear 2 and the torque output section 12 are assembled by a hot pressing connection process.

[0067] In this embodiment, when assembling the transmission gear 2 and the torque output section 12, in order to eliminate the influence of a large interference amount on the spline assembly, a hot pressing method is adopted for assembly, that is, first heat the part of the central hole 21 of the transmission gear 2 to make it expand due to heat, and then press-fit the torque output section 12 into the central hole 21. Then, neither the internal spline 22 nor the external spline 15 is easily crushed. After cooling, a very high clamping force will be generated between the internal spline 22 and the external spline 15.

[0068] As Figure 8 shown, a reduction mechanism provided by an embodiment of the present invention includes a differential 3, a reduction output shaft 4, and the intermediate shaft and transmission gear connection assembly described in any one of the foregoing embodiments.

[0069] A driving gear 5 is connected to the differential 3, the driving gear 5 is connected to the torque input section 11, and the transmission gear 2 is connected to the reduction output shaft 4.

[0070] The reduction mechanism provided by the present invention is a component of a vehicle reducer, and it includes a differential 3, a reduction output shaft 4, a driving gear 5, and the intermediate shaft and transmission gear connection assembly described above.

[0071] Regarding the structure, construction, and working principle of the intermediate shaft and transmission gear connection assembly, please refer to the description part of the intermediate shaft and transmission gear connection assembly above, and details will not be described herein again.

[0072] The output end of the differential 3 is provided with a driving gear 5, the driving gear 5 meshes and drives with the meshing teeth 14 on the torque input section 11. The transmission gear 2 meshes and drives with the meshing teeth 41 on the reduction output shaft 4. The torque output by the differential 3 is transmitted to the torque input section 11 through the driving gear 5, and then transmitted to the reduction output shaft 4 through the transmission gear 2. The radius of the driving gear 5 is larger than the radius of the meshing teeth 14, realizing a first-stage reduction. The radius of the transmission gear 2 is larger than the radius of the meshing teeth 41, realizing a second-stage reduction.

[0073] A vehicle provided by an embodiment of the present invention includes the deceleration mechanism described in the foregoing embodiment. The deceleration mechanism is assembled in the reducer of the vehicle.

[0074] According to needs, the above technical solutions can be combined to achieve the best technical effect.

[0075] The above are only the principles and preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, based on the principles of the present invention, several other modifications can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. An intermediate shaft and transmission gear connection assembly, characterized in that, It includes an intermediate shaft and a transmission gear; On the circumferential surface of the central hole of the transmission gear, there is an internal spline, and the internal spline includes multiple internal spline teeth evenly distributed along the circumferential direction of the central hole. There is an internal spline groove between any two adjacent internal spline teeth; The intermediate shaft includes a torque input section and a torque output section connected to the torque input section. On the outer circumferential surface of the torque output section, there is an external spline, and the external spline includes multiple external spline teeth evenly distributed along the circumferential direction of the torque output section. There is an external spline groove between any two adjacent external spline teeth; The torque output section passes through the central hole, and the internal spline and the external spline are in interference fit. Each external spline tooth is in interference fit in an internal spline groove, and each internal spline tooth is in interference fit in an external spline groove; Wherein, along the direction from the torque input section to the torque output section, the external spline teeth gradually become wider, and the external spline grooves gradually become narrower; and / or, along the direction from the torque output section to the torque input section, the internal spline teeth gradually become wider, and the internal spline grooves gradually become narrower.

2. The intermediate shaft and transmission gear connection assembly according to claim 1, characterized in that The external spline teeth include two relatively arranged external spline tooth sides; Along the direction from the torque input section to the torque output section, the distance between the two external spline tooth sides gradually increases.

3. The intermediate shaft and transmission gear connection assembly according to claim 2, wherein, One external spline tooth side is parallel to the axis of the intermediate shaft, and the other external spline tooth side extends obliquely relative to the axis of the intermediate shaft; or, the two external spline tooth sides respectively extend obliquely relative to the axis of the intermediate shaft, and the two external spline tooth sides are symmetrically arranged with respect to the axis of the intermediate shaft.

4. The intermediate shaft and transmission gear connection assembly according to claim 1, wherein, The internal spline teeth include two relatively arranged internal spline tooth sides; Along the direction from the torque output section to the torque input section, the distance between the two internal spline tooth sides gradually increases.

5. The intermediate shaft and transmission gear connection assembly according to claim 4, characterized in that, One internal spline tooth side is parallel to the center line of the central hole, and the other internal spline tooth side extends obliquely relative to the center line of the central hole; or, the two internal spline tooth sides respectively extend obliquely relative to the center line of the central hole, and the two internal spline tooth sides are symmetrically arranged with respect to the center line of the central hole.

6. The intermediate shaft and transmission gear connection assembly according to claim 1, characterized in that, The external spline teeth are in left - hand or right - hand helix, and the helix angle of the external spline teeth is between 15° and 25°; and / or, the internal spline teeth are in left - hand or right - hand helix, and the helix angle of the internal spline teeth is between 15° and 25°.

7. The intermediate shaft and drive gear connection assembly according to claim 1, characterized in that, The diameter of the torque input section is greater than the diameter of the torque output section, and a stop surface for stopping the transmission gear is formed at the connection between the torque output section and the torque input section.

8. The intermediate shaft and transmission gear connection assembly according to claim 1, characterized in that, The transmission gear and the torque output section are assembled by a hot - pressing connection process.

9. A speed reduction mechanism, characterized in that, It includes a differential, a reduction output shaft, and an intermediate shaft and transmission gear connection assembly as described in any one of claims 1 - 8; A driving gear is connected to the differential, the driving gear is connected to the torque input section, and the transmission gear is connected to the reduction output shaft.

10. A vehicle, characterized in that, It includes a reduction mechanism as described in claim 9.

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