A tachometer generator rotor structure

Abstract

The present invention provides a tachometer generator rotor structure, which solves the problem that when the existing tachometer generator rotor is docked with an external rotating component, the stress concentration of the connecting rod of the rotor structure will be caused due to the high coaxiality requirement, and the connecting rod is easy to break after long-term work. The rotor structure of the present invention includes a connecting rod, a shaft, a magnetic steel, and a limit ring. The magnetic steel is die-cast onto the shaft by die-casting. The connecting rod is axially placed inside the shaft. An annular groove is provided at the rear end of the connecting rod, and the limit ring is installed in the annular groove. The tachometer generator rotor structure of the present invention has good versatility and high reliability, which improves the current unreliable status of the circumferential and circumferential movement of the magnetic steel of the existing tachometer generator rotor, and overcomes the problem of stress concentration and easy breakage of the connecting rod due to the high coaxiality requirement when docking with an external rigid rotating component.

Description

Technical Field

[0001] The invention belongs to the technical field of motors and relates to a tachometer generator rotor structure. Background Art

[0002] The existing tachometer generator rotor structure is mostly a structure of multiple pairs of independent permanent magnet poles, which is not easy to assemble and it is difficult to ensure uniform distribution of the permanent magnet poles when they are distributed around the circumference of the rotor core. In addition, when the existing tachometer generator rotor is docked with external rotating parts, the high coaxiality requirements will cause stress concentration on the coupling rod of the rotor structure, and the coupling rod is prone to breakage after long-term operation. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a tachometer generator rotor with good versatility and high reliability, so as to improve the current unreliable circumferential and axial movement of the tachometer generator rotor magnetic steel, and overcome the problem of stress concentration and easy breakage of the connecting rod due to high coaxiality requirements when docking with external rigid rotating parts.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a tachometer generator rotor structure, characterized in that the rotor structure includes a connecting rod, a shaft, a magnetic steel, and a limit ring, the magnetic steel is die-cast onto the shaft by die-casting, the connecting rod is axially placed inside the shaft, an annular groove is provided at the rear end of the connecting rod, and the limit ring is installed in the annular groove.

[0005] Furthermore, the coupling rod comprises a small diameter section cylinder and a large diameter section cylinder, a first smooth transition step is provided between the small diameter section cylinder and the large diameter section cylinder, four rectangular sections are cut along the axial direction symmetrical in pairs from the tail end to the front end of the outer circumference of the large diameter section cylinder, and the annular groove is located at the tail end of the large diameter section cylinder after the sections are cut;

[0006] The shaft comprises a first cylindrical section, a second cylindrical section, a third cylindrical section and a fourth cylindrical section which are axially connected in sequence and integrally formed, wherein the outer diameters of the first cylindrical section, the second cylindrical section and the third cylindrical section increase in sequence, the outer diameter of the fourth cylindrical section is smaller than the outer diameter of the third cylindrical section, and an inner square hole is provided in the fourth cylindrical section, and a cylindrical inner hole is provided inside the shaft from the front end of the inner square hole to the front end face of the first cylindrical section of the shaft, and a second smooth transition step is provided between the end face of the cylindrical inner hole and the front end face of the inner square hole, the large diameter section cylinder of the coupling rod is placed in the inner square hole of the fourth cylindrical section of the shaft, and the annular groove is located on the outer side of the end face of the fourth cylindrical section.

[0007] Furthermore, a connector for docking with the rotating end of the engine is provided at the front end of the small diameter section cylinder.

[0008] Furthermore, the axial length of the rectangular section is smaller than the axial length of the large diameter section of the cylinder.

[0009] Furthermore, the gap between each of the rectangular cross-sections and the inner square hole is 0.02 mm-0.05 mm.

[0010] Furthermore, two spherical protrusions are arranged at intervals on the outer circumference of the second cylindrical segment, and two planes are symmetrically arranged on each spherical protrusion.

[0011] Furthermore, four grooves are evenly distributed on the outer circumferential surface of the first cylindrical segment.

[0012] Furthermore, the connecting rod is made of stainless steel.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The magnetic steel of the rotor structure of the present invention is integrally die-cast with the shaft, thereby improving production efficiency and reducing material consumption;

[0015] (2) The outer circumference of the shaft is designed with two spherical protrusions with two planes respectively. This structure can effectively prevent the problem of circumferential and axial movement of the magnetic steel under severe vibration conditions;

[0016] (3) The coupling rod is designed as a slender rod, which has good toughness. The coupling rod and the shaft are connected with a small rectangular gap (the gap is 0.02mm-0.05mm). This connection method can ensure that the coupling rod and the shaft rotate synchronously, and can also ensure that the coupling rod moves at a small angle in the circumferential direction with the axis as the center, thus overcoming the problem of high coaxiality requirements when docking with external rigid rotating parts, and can effectively prevent the coupling rod from breaking due to stress concentration when docking with external rotating parts;

[0017] (4) The connecting rod is made of stainless steel with high hardness and strength, which has good wear resistance and can ensure long-term and effective operation under the condition of docking with external rotating parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the connecting rod structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the shaft structure of the present invention;

[0021] Figure 4 It is a schematic diagram of the connection between the coupling rod and the shaft;

[0022] In the figure: 1-coupling rod; 1-1-small diameter section of cylinder; 1-2-large diameter section of cylinder; 1-3-connector; 1-4-first smooth transition step; 1-5-rectangular section; 1-6-annular groove; 2-axis; 2-1-first cylindrical section; 2-1-1-groove; 2-2-second cylindrical section; 2-3-third cylindrical section; 2-4-fourth cylindrical section; 2-4-1-inner square hole; 2-5-spherical protrusion; 2-5-1-plane; 2-6-cylindrical inner hole; 2-7-second smooth transition step; 3-magnetic steel; 4-limiting ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example

[0025] Reference Figure 1-Figure 4 A tachometer generator rotor structure includes a connecting rod 1, a shaft 2, a magnetic steel 3, and a limit ring 4. The magnetic steel 3 is die-cast onto the shaft 2 by die-casting. The connecting rod 1 is axially arranged inside the shaft 2. An annular groove 1-6 is provided at the rear end of the connecting rod 1, and the limit ring 4 is installed in the annular groove 1-6.

[0026] The coupling rod 1 comprises a small diameter section cylinder 1-1 and a large diameter section cylinder 1-2, a first smooth transition step 1-4 is provided between the small diameter section cylinder 1-1 and the large diameter section cylinder 1-2, four axially symmetrical rectangular sections 1-5 are cut from the tail end of the outer circumference of the large diameter section cylinder 1-2 to the front end, and the annular groove 1-6 is located at the front end of the large diameter section cylinder 1-2 after the sections are cut;

[0027] The shaft 2 comprises a first cylindrical segment 2-1, a second cylindrical segment 2-2, a third cylindrical segment 2-3 and a fourth cylindrical segment 2-4 which are axially connected in sequence and integrally formed, wherein the outer diameters of the first cylindrical segment 2-1, the second cylindrical segment 2-2 and the third cylindrical segment 2-3 increase in sequence, the outer diameter of the fourth cylindrical segment 2-4 is smaller than the outer diameter of the third cylindrical segment 2-3, and an inner square hole 2-4-1 is provided in the fourth cylindrical segment 2-4, and a cylindrical inner hole 2-6 is provided inside the shaft 2 from the front end of the inner square hole 2-4-1 to the front end face of the first cylindrical segment 2-1 of the shaft 2, and a second smooth transition step 2-7 matching the first smooth transition step 2-7 is provided between the end face of the cylindrical inner hole 2-6 and the front end face of the inner square hole 2-4-1. The first smooth transition step 2-7 is fitted with the step surface of the second smooth transition step 2-7. At this time, there is a gap between the rectangular section 1-5 and the inner square hole 2-4-1, and the gap between each rectangular section 1-5 and the inner square hole 2-4-1 is 0.02mm-0.05mm. The gap value can be adjusted between 0.02mm-0.05mm according to the actual range of circumferential movement of the end of the coupling rod, so that the coupling rod and the shaft are connected with a smaller gap.

[0028] A connector 1-3 for docking with the rotating end of the engine is provided at the end of the small diameter section cylinder 1-1.

[0029] The axial length of the rectangular section 1-5 is smaller than the axial length of the large diameter section cylinder 1-2.

[0030] The gap between each rectangular section 1-5 and the inner square hole 2-4-1 is 0.02mm-0.05mm.

[0031] Two spherical protrusions 2-5 are arranged at intervals on the outer periphery of the second cylindrical segment 2-2 and coaxially with the second cylindrical segment 2-2, and two planes 2-5-1 are symmetrically arranged on each spherical protrusion 2-5.

[0032] Four grooves 2-1-1 are evenly distributed on the outer circumference of the first cylindrical segment 2-1, and the grooves 2-1-1 are used for installing the locking nut and the shaft.

[0033] The connecting rod 1 is made of high-hardness stainless steel.

[0034] The magnetic steel of the present invention is die-cast onto the outside of the shaft by die-casting. Such a structure improves production efficiency and reduces material consumption. Two spherical protrusions 2-5 with a planar structure are provided on the shaft, and the magnetic steel is die-cast on the outside of the two spherical protrusions 2-5. Such a structure can effectively prevent the problem of circumferential and axial movement of the magnetic steel under severe vibration conditions.

[0035] In addition, the connecting rod 1 is designed as a slender rod structure, which has good toughness and is connected to the shaft 2 with a small gap (the gap between each rectangular section 1-5 and the inner square hole 2-4-1 is 0.02mm-0.05mm, and the gap value can be adjusted between 0.02mm-0.05mm according to the actual range of circumferential movement of the connecting rod end). This connection method can ensure that the connecting rod rotates synchronously with the shaft, and can ensure that the connecting rod can move at a small angle in the circumferential direction with the axis as the center, which overcomes the problem of high coaxiality requirements when docking with external rigid rotating parts, and can effectively prevent the problem of connecting rod breakage due to stress concentration when docking with external rotating parts. The stop ring 4 is a circular ring formed by bending stainless steel wire, which is stuck in the annular groove 1-6, and is placed in the inner square hole 2-4-1 of the shaft 2 together with the large diameter section cylinder 1-2 with a rectangular section 1-5. The step structure of the first smooth transition step 2-7 and the step surface of the second smooth transition step 2-7 fit together to play an axial limit role for the connecting rod 1. The structure of the present invention has good versatility and high reliability, and can be widely used in occasions where it is necessary to dock with external rotating parts.

[0036] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A tachometer generator rotor structure, characterized in that: The rotor structure includes a connecting rod, a shaft, a magnetic steel, and a limit ring. The magnetic steel is die-cast onto the shaft by die-casting. The connecting rod is axially arranged inside the shaft. An annular groove is provided at the rear end of the connecting rod, and the limit ring is installed in the annular groove. The coupling rod comprises a small diameter section cylinder and a large diameter section cylinder, a first smooth transition step is provided between the small diameter section cylinder and the large diameter section cylinder, four rectangular sections are cut along the axial direction symmetrical in pairs from the tail end to the front end of the outer circumference of the large diameter section cylinder, and the annular groove is located at the tail end of the large diameter section cylinder after the sections are cut; The shaft comprises a first cylindrical segment, a second cylindrical segment, a third cylindrical segment and a fourth cylindrical segment which are axially connected in sequence and integrally formed, wherein the outer diameters of the first cylindrical segment, the second cylindrical segment and the third cylindrical segment increase in sequence, the outer diameter of the fourth cylindrical segment is smaller than the outer diameter of the third cylindrical segment, and an inner square hole is provided in the fourth cylindrical segment, and a cylindrical inner hole is provided inside the shaft from the front end of the inner square hole to the front end face of the first cylindrical segment of the shaft, and a second smooth transition step is provided between the end face of the cylindrical inner hole and the front end face of the inner square hole, the large diameter section cylinder of the coupling rod is placed in the inner square hole of the fourth cylindrical segment of the shaft, and the annular groove is located on the outer side of the end face of the fourth cylindrical segment; A connector for docking with the rotating end of the engine is provided at the front end of the small diameter section cylinder; The axial length of the rectangular section is smaller than the axial length of the large diameter section cylinder.

2. A tachometer generator rotor structure according to claim 1, characterized in that: The gap between each rectangular section and the inner square hole is 0.02mm-0.05mm.

3. A tachometer generator rotor structure according to claim 1, characterized in that: Two spherical protrusions are arranged at intervals on the outer circumference of the second cylindrical segment, and two planes are symmetrically arranged on each spherical protrusion.

4. A tachometer generator rotor structure according to claim 1, characterized in that: Four grooves are evenly distributed on the outer circumferential surface of the first cylindrical segment.

5. A tachometer generator rotor structure according to claim 1, characterized in that: The connecting rod is made of stainless steel.

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