High-stability automobile motor shaft

Abstract

The utility model discloses a high-stability automobile motor shaft which comprises a shaft body, and a belt wheel installation section and a gear installation section which are arranged at intervals are arranged on the shaft body. At least two notch grooves suitable for screws to be arranged are formed in the peripheral wall of the belt wheel installation section, and the notch grooves extend in the axial direction. And a straight knurling structure matched with the gear inner ring is arranged on the gear mounting section. Compared with the prior art, the belt wheel is installed through the belt wheel installation section arranged on the shaft body, when the belt wheel is installed, the bolt is screwed into the threaded hole of the belt wheel to be pressed on the notch groove so as to fix the belt wheel, and therefore the effects of fixing the belt wheel and stably transmitting torque are achieved. The straight knurling structure of the gear mounting section enables the meshing force between the rotating shaft and the gear to be sufficient.

Description

Technical Field

[0001] The utility model relates to the automobile field, in particular to a high-stability automobile motor shaft. Background Art

[0002] New energy vehicles are becoming more and more popular in people's daily life due to their pollution-free advantages. New energy vehicles are vehicles that use battery modules as energy storage power sources, and provide electricity to the motor through the battery modules to drive the vehicle. They are vehicles that meet the requirements of road traffic and safety regulations. As their impact on the environment is relatively small compared to traditional vehicles, their prospects are widely optimistic. New energy vehicles include pure electric vehicles, extended-range electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0003] For example, the Chinese invention application with application number 202311334173.2 (application publication number CN117220445A) discloses a new energy vehicle motor-driven linkage power generation and power supply system, including a vehicle floor, the upper surface of the vehicle floor is provided with a vehicle shell, the upper surface of the vehicle floor is fixedly connected with an energy storage device, the upper surface of the vehicle floor is fixedly connected with a driving device, the other end of the two wheel shafts is fixedly connected with a tire, the upper surface of the vehicle floor is fixedly connected with two symmetrically arranged hollow boxes, and the wheel shaft, tire, pulley, and transmission belt are arranged to cooperate with the rotating rod, and the generator generates electricity and charges the battery module through the transformer; there are two symmetrically arranged pulleys in the hollow box, the two pulleys located on the left are respectively fixedly connected to the surfaces of the two wheel shafts, and the two pulleys located on the right are rotatably connected to the inner wall of the hollow box. The wheel shaft of the utility model is a bare rod, and when the pulley is fixedly connected, it is easy to have the problem of insufficient bite force between the wheel shaft and the pulley, which is not conducive to the stable transmission of torque. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a high-stability automobile motor shaft with sufficient bite force and stable torque transmission in view of the above technical status quo.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a high-stability automobile motor shaft, including a shaft body, characterized in that: the shaft body is provided with a pulley mounting section and a gear mounting section arranged at intervals; the outer peripheral wall of the pulley mounting section is provided with at least two notch grooves suitable for screw setting, and the notch grooves extend axially; the gear mounting section is provided with a straight knurling structure adapted to the inner ring of the gear.

[0006] In order to achieve axial and radial positioning during assembly, preferably, a plane is provided at one end of the shaft body, and the plane extends axially from one end surface of the shaft body to the other end of the shaft body, so that one end of the shaft body forms a first flat section for mounting the cutting disc.

[0007] Preferably, the outer peripheral wall of the other end of the shaft body is provided with two opposite flat portions, so that the other end of the shaft body forms a second flat portion section, and the gear is sleeved thereon. The two opposite flat portions cooperate with the inner double flat structure of the large gear to transmit torque and output power.

[0008] In order to avoid the tooth ends of the internal threads during the external cylindrical grinding process and ensure the accuracy of the grinding size, preferably, a countersink is provided in the shaft body, and an internal thread is provided on the peripheral wall of the countersink.

[0009] Preferably, the shaft body is provided with a first bearing mounting section and a second bearing mounting section spaced apart in the axial direction, and the first bearing mounting section is arranged between the gear mounting section and the pulley mounting section and is connected with one end of the gear mounting section.

[0010] In order to reduce the pressing force of the bearing installation and prevent damage to the bearing during installation, preferably, a transition section is provided between the first bearing installation section and the gear installation section, and the cross-sectional diameter of the transition section is smaller than the cross-sectional diameter of the first bearing installation section.

[0011] For positioning during installation, preferably, a connecting section is provided between the second bearing mounting section and the pulley mounting section, and the cross-sectional diameters of the pulley mounting section and the second bearing mounting section are both smaller than the cross-sectional diameter of the connecting section.

[0012] In order to eliminate the phenomenon of not clearing the root during grinding and avoid the phenomenon of not being in place during fitting, preferably, a tool withdrawal groove is provided on the shaft body between the connecting section and the second bearing mounting section.

[0013] Preferably, the tolerance of the gear mounting section is 0.07 mm, the pitch is 0.8 mm, and the runout is 0.05 mm.

[0014] Compared with the prior art, the advantages of the utility model are: the pulley is installed by means of a pulley installation section arranged on the shaft body, and at least two notched grooves are arranged on the outer peripheral wall of the pulley installation section. When installing the pulley, the bolt is screwed into the threaded hole of the pulley and pressed on the notched groove to fix the pulley, thereby enabling the torque to be transmitted stably between the motor and the pulley, and the radial position of the pulley can be fine-tuned by screwing the bolt to improve the transmission accuracy; the straight knurled structure of the gear installation section increases the friction between the gear installation section and the gear, which can make the connection between the gear installation section and the gear stronger and the connection more secure, thereby ensuring sufficient bite force between the motor shaft and the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment;

[0016] Figure 2 for Figure 1 A cross-sectional view at AA;

[0017] Figure 3 for Figure 1 Schematic diagram of BB;

[0018] Figure 4 for Figure 1 Side view from the C direction. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] like Figure 1-4 The preferred embodiment of the utility model is shown in FIG. 1 . The high-stability automobile motor shaft comprises a shaft body 100; the shaft body 100 comprises a first flat section 3, a gear mounting section 2, a transition section 8, a first bearing mounting section 6, a pulley mounting section 1, a connecting section 9, a second bearing mounting section 7 and a second flat section 4 in sequence from the first end a to the second end b.

[0021] like Figure 1 and Figure 3 As shown, the pulley mounting section 1 is arranged on the shaft body 100, and four notched grooves 11 are opened on the outer peripheral wall of the pulley mounting section 1, and the notched grooves 11 extend in the axial direction; when the pulley is installed in the pulley mounting section 1, the high-strength bolts are screwed into the threaded holes of the pulley and pressed on the four notched grooves 11 to fix the pulley, thereby achieving the functions of fixing the pulley and transmitting torque, and the bolts can be screwed in to fine-tune the radial position of the pulley to improve the transmission accuracy.

[0022] like Figure 1 As shown, the gear mounting section 2 is arranged on the shaft body 100, and a straight knurling structure is provided on the gear mounting section 2. The greater the friction between the gear mounting section 2 and the gear, the stronger and more secure the connection between the gear mounting section 2 and the gear, so that the bite force between the rotating shaft and the gear is sufficient. The tolerance of the gear mounting section 2 is 0.07mm, the pitch is 0.8mm, and the runout is 0.05mm.

[0023] like Figure 1 and Figure 2 As shown, a plane 31 is provided at one end of the shaft body 100, and the plane 31 extends axially from one end surface of the shaft body 100 to the other end of the shaft body 100, so that one end of the shaft body 100 forms a first flat section 3 for mounting the cutting disc; the first flat section 3 can be axially and radially positioned during assembly to improve the installation accuracy; the tolerance is 0.2mm for thickness and 5mm for length.

[0024] like Figure 1 and Figure 4 As shown, two opposite flat portions 41 are provided on the outer peripheral wall of the other end of the shaft body 100, so that the other end of the shaft body 100 forms a second flat portion 4, and the gear is sleeved thereon. The tolerance of the flat portion 41 is 0.1mm, and the axial length is 10.5mm. The second flat portion 4 and the inner double flat structure of the gear cooperate to transmit torque and output power.

[0025] like Figure 1 As shown, a counterbore 5 is provided in the shaft body 100, and an internal thread 51 is provided on the peripheral wall of the counterbore 5, and the effective depth of the internal thread 51 is more than 15 mm. The shaft body 100 is provided with a first bearing mounting section 6 and a second bearing mounting section 7 spaced apart along the axial direction, and the first bearing mounting section 6 is arranged between the gear mounting section 2 and the pulley mounting section 1, and is connected with one end of the gear mounting section 2. A transition section 8 is provided between the first bearing mounting section 6 and the gear mounting section 2, and the cross-sectional diameter of the transition section 8 is smaller than the cross-sectional diameter of the first bearing mounting section 6, so as to reduce the pressing force of the bearing installation and prevent damage to the bearing during the installation process. A connecting section 9 is provided between the second bearing mounting section 7 and the pulley mounting section 1, and the cross-sectional diameters of the pulley mounting section 1 and the second bearing mounting section 7 are both smaller than the cross-sectional diameter of the connecting section 9. The tolerance of the first bearing mounting section 6 is 0.008 mm, the roughness is Ra0.8 um, and the roundness is 0.003 mm; the tolerance is 0.008 mm, and the roughness of the second bearing mounting section 7 is Ra0.8 um, and the roundness is 0.003 mm.

[0026] The shaft body 100 is provided with a back cutter groove 91 between the connecting section 9 and the second bearing mounting section 7, and a second back cutter groove 61 between the first bearing mounting section 6 and the pulley mounting section 1, thereby eliminating the phenomenon of not clearing the root during grinding and avoiding the phenomenon of not being in place during fitting.

Claims

1. A highly stable automobile motor shaft, comprising a shaft body (100), characterized in that: The shaft body (100) is provided with a pulley mounting section (1) and a gear mounting section (2) which are arranged at intervals; the outer peripheral wall of the pulley mounting section (1) is provided with at least two notched grooves (11) suitable for screw installation, and the notched grooves (11) extend in the axial direction; the gear mounting section (2) is provided with a straight knurling structure adapted to the inner ring of the gear.

2. The highly stable automobile motor shaft according to claim 1, characterized in that: A plane (31) is provided at one end of the shaft body (100), and the plane (31) extends axially from one end surface of the shaft body (100) toward the other end of the shaft body (100), so that one end of the shaft body (100) forms a first flat section (3) for mounting a cutting disc.

3. The high stability automobile motor shaft according to claim 2, characterized in that: Two opposite flattened portions (41) are arranged on the outer peripheral wall of the other end of the shaft body (100), so that the other end of the shaft body (100) forms a second flattened portion section (4) for the gear to be sleeved thereon.

4. The highly stable automobile motor shaft according to claim 1, characterized in that: A countersunk hole (5) is provided in the shaft body (100), and an internal thread (51) is provided on the peripheral wall of the countersunk hole (5).

5. The highly stable automobile motor shaft according to claim 1, characterized in that: The shaft body (100) is provided with a first bearing mounting section (6) and a second bearing mounting section (7) at intervals along the axial direction; the first bearing mounting section (6) is arranged between the gear mounting section (2) and the pulley mounting section (1), and is connected to one end of the gear mounting section (2).

6. The highly stable automobile motor shaft according to claim 5, characterized in that: A transition section (8) is provided between the first bearing mounting section (6) and the gear mounting section (2), and the cross-sectional diameter of the transition section (8) is smaller than the cross-sectional diameter of the first bearing mounting section (6).

7. The highly stable automobile motor shaft according to claim 5, characterized in that: A connecting section (9) is provided between the second bearing mounting section (7) and the pulley mounting section (1); the cross-sectional diameters of the pulley mounting section (1) and the second bearing mounting section (7) are both smaller than the cross-sectional diameter of the connecting section (9).

8. The highly stable automobile motor shaft according to claim 7, characterized in that: The shaft body (100) is provided with a cutter recess (91) located between the connecting section (9) and the second bearing mounting section (7).

9. The highly stable automobile motor shaft according to claim 1, characterized in that: The tolerance of the gear mounting section (2) is 0.07 mm, the pitch is 0.8 mm, and the runout is 0.05 mm.

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