CN103066791A

CN103066791A - Automobile meter stepping motor structure

Info

Publication number: CN103066791A
Application number: CN2011103399039A
Authority: CN
Inventors: 孙义质
Original assignee: Individual
Current assignee: Shen Yuqin
Priority date: 2011-10-20
Filing date: 2011-10-20
Publication date: 2013-04-24

Abstract

An automobile meter stepping motor structure mainly comprises a permanent magnet rotor, three stators, stator coils, a speed reduction gear and an output gear. The permanent magnet rotor comprises a plastic support and a magnetic ring, wherein a gear on the permanent magnet rotor is meshed with the speed reduction gear and the output gear. Each stator is formed by overlaying two pieces of permeability alloy, end faces of the three stators are spliced on the same plane with the complementary lengths, the spliced positions are tightly pressed by four elastic protruded arcs in an upper cover of a casing, terminal pins are embedded on coil frameworks of the stator coils and can be connected wit a driving power supply, and an output shaft in the center of the output gear extends out of the casing to be used for assembling an indicator point. The automobile meter stepping motor structure has the advantages that mould manufacturing difficulties are greatly reduced, injection moulding process requirements are greatly reduced, leakage flux is effectively reduced, product yield is improved, and industrialization is easy to realize.

Description

A kind of structure of automobile instrument stepping motor

Technical field

The present invention relates to a kind of stepping motor, especially relate to a kind of structure of automobile instrument stepping motor.

Background technology

The automobile instrument stepping motor of existing main flow mainly comprises with lower member: p-m rotor, stator, stator coil, reduction gearing, output gear, described p-m rotor is that magnetic pole and gear are integrated, magnetic pole is a pair of, external diameter only has 2mm, gear has 6 in tooth, described stator is comprised of main stator sheet and the butt strip of " worker " font, butt strip rides over the both sides of " worker " font main stator sheet, whole " day " font that forms of stator, coil is on butt strip, shell is stretched out by terminal pin in two of coil, can be connected with driving power, described output gear is with output shaft, its external diameter 13.68mm, but there is tooth many to 120, such structural disadvantages is that rotor diameter only has 2mm, reach certain output torque and rotating speed and just speed reducing ratio must be designed into 180: 1, so that being forced, output gear is designed with 120 teeth on external diameter only has 13.68mm, the modulus all too of this gear is little, the line cutting copper wire of mfg. moulding die needs thin to diameter 0.03mm, the lathe that uses the 0.03mm line of cut through being everlasting is seldom arranged in the world, that is to say that the mould manufacturing is just very difficult, while Shooting Technique also difficulty reaches error requirements, cause the accessory qualification rate of production just lower, industrialization is just had any problem.This structure only has and resembles the production of just having ready conditions of similar enterprises that Switzerland produces accurate wrist-watch, and the General development Chinese Home is difficult to produce, and resembles the Mainland China and copies 10 years, does not also have so far one to realize industrialization.

In existing another stator structure design, stator also is three compositions (every is that monolithic or several build up), but an end face of every is as magnetic pole, every other end (if stator is monolithic) generally is mutual pressure, need to be pressed with folding line in the pressure position and reach piece and piece at same plane, much more like this operation of backfin trace; If (stator by several build up) other end generally is the plane amalgamation, amalgamation position A, A ' and B, B ' are the centres that is hidden in the coil rack, see Fig. 1, like this actual product of Fig. 2 of the patent No. 200620130640.5 is exactly, and do not draw, because the coil rack endoporus has error in the mill, cause stator piece to insert that pine is sometimes tight sometimes, insert when tight and have any problem, the leakage field during pine between stator piece increases, and the benefit of motor reduces.

Summary of the invention

Purpose of the present invention is exactly in order to overcome above-mentioned weak point of the prior art, a kind of structure of automobile instrument stepping motor is provided, its accessory is as long as use conventional mould manufacture level, just can make with the Shooting Technique of routine, the qualification rate that accessory is produced improves, and reaches the purpose that realizes industrialization.

The present invention realizes by following scheme: a kind of structure of automobile instrument stepping motor mainly comprises p-m rotor, stator, stator coil, reduction gearing, output gear, described p-m rotor comprises plastic stent and magnet ring, described magnet ring has 4 pairs of magnetic poles, external diameter is 8mm, be tightly placed in plastic stent below, the top of described plastic stent is that plastic gear has 8 teeth, there is axis hole at the center of plastic stent, shaft hole sleeve is on fixing axle, described stator forms by three, and every has two permalloys to be formed by stacking, and wherein first of stator is

Shape, second of stator be

Shape, the 3rd of stator is " ⊥ " shape, an end face of every is as the magnetic pole of stator, magnetic pole is evenly distributed in the periphery of rotor, interval 120 degree are distributed on the circular arc ring, first respectively plane amalgamation of two ends, the left and right sides of passing respectively coil rack center and the 3rd " ⊥ " shape of stator with a vertical end of second of stator of stator, described amalgamation be two permalloys with the amalgamation end of each piece be made into long have short, the distance of length is exactly the width of stator piece, first of stator and second of stator are made into top that length of a film, below that sheet short, it is short that the 3rd of stator is made into top that sheet, below that length of a film, the complementary mutually amalgamation of length at grade, pressed respectively by four resilient convex arcs in the outer casing upper cover at the amalgamation seam crossing, reduce the loosening gap that produces between the fluctuating plate of mosaic, effectively reduce leakage field.Described stator coil by coil on coil rack, symmetrical have two covers, described coil rack is that plastics are made, the coil rack inner core is empty, for first of stator, second vertical bar of stator passes respectively, every coil rack is embedded with two terminal pins, described terminal pin stretches out outside the shell, can be connected with driving power, the large external diameter 11.4mm of described reduction gearing has 48 teeth, little external diameter 2.1mm has 8 teeth, and described output gear center is with output shaft, outside diameter of gear 13.13mm, 60 teeth are arranged, described output shaft reaches out of the shell, and is used for the assembling pointer, the gear of described p-m rotor, with reduction gearing, output gear intermeshes, through two stage speed change, the reduction of speed that reaches ratio is 45: 1.

The invention has the beneficial effects as follows:

1, by having increased root diameter and magnetic pole logarithm, the moment of output is increased, the rotating speed of rotor lowers, speed reducing ratio is reduced, and the tooth number that reaches output gear reduces, and the modulus of tooth is increased, the manufacture difficulty of gear die has greatly reduced like this, the technological requirement of injection moulding has greatly reduced, and impels the qualification rate of product to improve, and has easily entered industrialization.

2, the change by stator structure, the design stator forms by three, every is formed by stacking by two, the position of amalgamation is chosen in four resilient convex arcs that can have in the loam cake and is pressed on respectively seam crossing mutually, reduced the loosening gap that produces between the sheet of mosaic, effectively reduce leakage field, improve the quality stability of product.

Description of drawings

Fig. 1 is a kind of stator amalgamation schematic diagram of prior art, and the amalgamation position is middle A, A ' and B, B ' in coil hole.

Fig. 2 is the structural plan schematic diagram of embodiments of the invention.

Fig. 3 is the construction rotor structural representation of embodiments of the invention.

Embodiment

The invention will be further described below in conjunction with accompanying drawing 2, Fig. 3 and embodiment:

Fig. 2, Fig. 3 show execution mode of structure of a kind of automobile instrument stepping motor of the present invention.A kind of structure of automobile instrument stepping motor mainly comprises p-m rotor 1, stator 2.1,2.2 and 2.3, stator coil 3.1 and 3.2, reduction gearing 4, output gear 5, described p-m rotor 1 comprises plastic stent 1.1 and magnet ring 1.2, described magnet ring has 4 pairs of magnetic poles, external diameter is 8mm, be tightly placed in plastic stent 1.1 belows, the top of described plastic stent 1.1 is that plastic gear 1.1.1 has 8 teeth, there is axis hole at the center of plastic stent 1.1, shaft hole sleeve is on fixing axle, described stator forms by three, and every has two permalloys to be formed by stacking, and wherein first 2.1 of stator is

Shape, second 2.2 of stator be

Shape, the 3rd 2.3 of stator is " ⊥ " shapes, an end face of every is as the magnetic pole of stator, magnetic pole is evenly distributed in the periphery of rotor, interval 120 degree are distributed on the circular arc ring, first 2.1 respectively plane amalgamation of two ends, the left and right sides of passing respectively stator coil center and the 3rd 2.3 " ⊥ " shape of stator with second 2.2 vertical end of stator of stator, described amalgamation be two permalloys with the amalgamation end be made into long have short, the distance of length is exactly the width of stator piece, second 2.2 of first 2.1 of stator and stator are made into top that length of a film, below that sheet short, it is short that the 3rd 2.3 of stator is made into top that sheet, below that length of a film, the complementary mutually amalgamation of length at grade, at amalgamation seam crossing A, A ' and B, B ' is pressed respectively by four the resilient convex arcs (figure does not draw) in the outer casing upper cover, reduces mosaic A, A ' and B, leakage field is effectively reduced in the loosening gap that produces between B ' sheet.Described stator coil is comprised of coil 3.1 and coil rack 3.2, coil 3.1 is on coil rack 3.2, symmetrical have two covers, described coil rack 3.2 is that plastics are made, coil rack 3.2 inner cores are empty, supply first 2.1 of stator, second 2.2 vertical bar of stator pass respectively, every coil rack 3.2 is embedded with two terminal pins, described terminal pin stretches out outside the shell, can be connected with driving power, and the large external diameter 11.4mm of described reduction gearing 4 has 48 teeth, little external diameter 2.1mm has 8 teeth, described output gear 5 centers are with output shaft, outside diameter of gear 13.13mm has 60 teeth, and described output shaft reaches out of the shell, be used for the assembling pointer, the gear of described p-m rotor, with reduction gearing, output gear intermeshes, and through two stage speed change, the reduction of speed that reaches ratio is 45: 1.

The present invention greatly reduces the accessory manufacture difficulty through above structural innovation, and the technological requirement of injection moulding greatly reduces, and impels the qualification rate of product to improve, and effectively reduces leakage field, improves the quality stability of product.

Claims

1. the structure of an automobile instrument stepping motor mainly comprises p-m rotor, stator, stator coil, reduction gearing, output gear, gear on the described p-m rotor, with reduction gearing, output gear intermeshes, described stator forms by three, every has two permalloys to be formed by stacking, the coil of described stator coil is on coil rack, two symmetrical covers are arranged, described coil rack is embedded with terminal pin and stretches out outside the shell, can be connected with driving power, described output gear center is with output shaft, output shaft reaches out of the shell, and is used for the assembling pointer, and it is characterized in that: described p-m rotor comprises plastic stent and magnet ring, described magnet ring has 4 pairs of magnetic poles, external diameter is 8mm, is tightly placed in plastic stent below, and the top of described plastic stent is that plastic gear has 8 teeth, there is axis hole at the center of plastic stent, and shaft hole sleeve is on fixing axle.

2. according to the structure of claims 1 described a kind of automobile instrument stepping motor, it is characterized in that: described stator forms by three, every has two permalloys to be formed by stacking, first respectively amalgamation of two ends, the left and right sides of passing respectively coil rack center and the 3rd " ⊥ " shape of stator with second vertical end of stator of stator, described amalgamation be two permalloys with the amalgamation end be made into long have short, the distance of length is exactly the width of stator piece, first of stator and second of stator are made into top that length of a film, below that sheet short, it is short that the 3rd of stator is made into top that sheet, below that length of a film, the complementary mutually amalgamation of length is at grade.

3. according to the structure of claims 2 described a kind of automobile instrument stepping motors, described stator forms by three, every has two permalloys to be formed by stacking, three respectively amalgamations, and two complementary mutually amalgamations of permalloy length is characterized in that at grade:, pressed respectively by four resilient convex arcs in the outer casing upper cover at the amalgamation seam crossing, reduce the loosening gap that produces between the sheet of mosaic, effectively reduce leakage field.